Roll abseil_revision cd86d0d20a..aa468ad755.

Change Log:
https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+log/cd86d0d20a..aa468ad755
Full diff:
https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+/cd86d0d20a..aa468ad755

Bug: None
Change-Id: I60b77aab9d6bf82fb8f914ff67b07ae3edbdf51b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599604
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658528}

third_party/abseil-cpp/README.chromium

@@ -4,7 +4,7 @@ URL: https://github.com/abseil/abseil-cpp
 License: Apache 2.0
 License File: LICENSE
 Version: 0
-Revision: cd86d0d20ab167c33b23d3875db68d1d4bad3a3b
+Revision: aa468ad75539619b47979911297efbb629c52e44
 Security Critical: yes
 
 Description:

third_party/abseil-cpp/absl/CMakeLists.txt

@@ -20,6 +20,7 @@ add_subdirectory(base)
 add_subdirectory(algorithm)
 add_subdirectory(container)
 add_subdirectory(debugging)
+add_subdirectory(flags)
 add_subdirectory(hash)
 add_subdirectory(memory)
 add_subdirectory(meta)

third_party/abseil-cpp/absl/container/internal/raw_hash_set.h

@@ -969,7 +969,7 @@ class raw_hash_set {
   // This overload kicks in when the argument is an rvalue of init_type. Its
   // purpose is to handle brace-init-list arguments.
   //
-  //   flat_hash_set<std::string, int> s;
+  //   flat_hash_map<std::string, int> s;
   //   s.insert({"abc", 42});
   std::pair<iterator, bool> insert(init_type&& value) {
     return emplace(std::move(value));

third_party/abseil-cpp/absl/copts/GENERATED_AbseilCopts.cmake

@@ -201,6 +201,7 @@ list(APPEND ABSL_MSVC_FLAGS
     "/wd4180"
     "/wd4244"
     "/wd4267"
+    "/wd4503"
     "/wd4800"
 )
 

third_party/abseil-cpp/absl/copts/GENERATED_copts.bzl

@@ -202,6 +202,7 @@ ABSL_MSVC_FLAGS = [
     "/wd4180",
     "/wd4244",
     "/wd4267",
+    "/wd4503",
     "/wd4800",
 ]
 

third_party/abseil-cpp/absl/copts/copts.py

@@ -163,8 +163,8 @@ COPT_VARS = {
     "ABSL_LLVM_TEST_FLAGS":
         LLVM_TEST_DISABLE_WARNINGS_FLAGS,
     "ABSL_LLVM_EXCEPTIONS_FLAGS": ["-fexceptions"],
-    "ABSL_CLANG_CL_FLAGS": (
-        MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
+    "ABSL_CLANG_CL_FLAGS":
+        (MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
     "ABSL_CLANG_CL_TEST_FLAGS":
         LLVM_TEST_DISABLE_WARNINGS_FLAGS,
     "ABSL_CLANG_CL_EXCEPTIONS_FLAGS":
@@ -179,6 +179,8 @@ COPT_VARS = {
             "/wd4244",
             # conversion from 'size_t' to 'type', possible loss of data
             "/wd4267",
+            # The decorated name was longer than the compiler limit
+            "/wd4503",
             # forcing value to bool 'true' or 'false' (performance warning)
             "/wd4800",
         ],

third_party/abseil-cpp/absl/copts/generate_copts.py

@@ -70,8 +70,9 @@ class StarlarkStyle(object):
     return "GENERATED_copts.bzl"
 
 
-# Copt file generation
 def copt_list(name, arg_list, style):
+  """Copt file generation."""
+
   make_line = lambda s: "    \"" + s + "\"" + style.separator()
   external_str_list = [make_line(s) for s in arg_list]
 

third_party/abseil-cpp/absl/flags/BUILD.bazel

+#
+#  Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load(
+    "//absl:copts/configure_copts.bzl",
+    "ABSL_DEFAULT_COPTS",
+    "ABSL_DEFAULT_LINKOPTS",
+    "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])  # Apache 2.0
+
+cc_library(
+    name = "internal",
+    srcs = [
+        "internal/program_name.cc",
+    ],
+    hdrs = [
+        "internal/path_util.h",
+        "internal/program_name.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "config",
+    srcs = [
+        "usage_config.cc",
+    ],
+    hdrs = [
+        "config.h",
+        "usage_config.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "marshalling",
+    srcs = [
+        "marshalling.cc",
+    ],
+    hdrs = [
+        "marshalling.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/strings:str_format",
+    ],
+)
+
+cc_library(
+    name = "handle",
+    srcs = [
+        "internal/commandlineflag.cc",
+    ],
+    hdrs = [
+        "internal/commandlineflag.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":marshalling",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/synchronization",
+        "//absl/types:optional",
+    ],
+)
+
+cc_library(
+    name = "registry",
+    srcs = [
+        "internal/registry.cc",
+        "internal/type_erased.cc",
+    ],
+    hdrs = [
+        "internal/registry.h",
+        "internal/type_erased.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":handle",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/base:dynamic_annotations",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "flag",
+    srcs = [
+        "flag.cc",
+    ],
+    hdrs = [
+        "declare.h",
+        "flag.h",
+        "internal/flag.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":handle",
+        ":marshalling",
+        ":registry",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/strings",
+    ],
+)
+
+cc_library(
+    name = "usage",
+    srcs = [
+        "internal/usage.cc",
+    ],
+    hdrs = [
+        "internal/usage.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":flag",
+        ":handle",
+        ":internal",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "parse",
+    srcs = ["parse.cc"],
+    hdrs = [
+        "internal/parse.h",
+        "parse.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":flag",
+        ":handle",
+        ":internal",
+        ":registry",
+        ":usage",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+cc_test(
+    name = "commandlineflag_test",
+    size = "small",
+    srcs = [
+        "internal/commandlineflag_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":handle",
+        ":registry",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "flag_test",
+    size = "small",
+    srcs = [
+        "flag_test.cc",
+        "flag_test_defs.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "marshalling_test",
+    size = "small",
+    srcs = [
+        "marshalling_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":marshalling",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "path_util_test",
+    size = "small",
+    srcs = [
+        "internal/path_util_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "parse_test",
+    size = "small",
+    srcs = [
+        "parse_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":parse",
+        "//absl/base",
+        "//absl/base:scoped_set_env",
+        "//absl/strings",
+        "//absl/types:span",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "program_name_test",
+    size = "small",
+    srcs = [
+        "internal/program_name_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "type_erased_test",
+    size = "small",
+    srcs = [
+        "internal/type_erased_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":registry",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "usage_config_test",
+    size = "small",
+    srcs = [
+        "usage_config_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":internal",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "usage_test",
+    size = "small",
+    srcs = [
+        "internal/usage_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":flag",
+        ":internal",
+        ":parse",
+        ":usage",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest",
+    ],
+)

third_party/abseil-cpp/absl/flags/BUILD.gn

+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build_overrides/build.gni")
+
+# Usage of Abseil in Chromium is guarded by an explicit opt-in list, before
+# adding projects to this list please reach out to cxx@chromium.org and CC:
+# - https://cs.chromium.org/chromium/src/third_party/abseil-cpp/OWNERS
+#
+# More information can be found at:
+# https://docs.google.com/document/d/1DgS1-A3rzboTLjpf4m1sqkJgWjnY_Ru2dokk1X1vBDU
+if (build_with_chromium) {
+  visibility = [
+    "//libassistant/*",
+    "//third_party/webrtc/*",
+    "//third_party/abseil-cpp/*",
+    "//third_party/googletest:gtest",
+  ]
+} else {
+  visibility = [ "*" ]
+}
+
+# Build targets in this module are marked as "testonly" because it is not clear
+# how ABSL_FLAG will interact with //base/command_line.h.
+# If this is a problem, feel free to remove "testonly" and use "assert_no_deps"
+# on the main Chrome binary.
+
+source_set("internal") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "internal/program_name.cc",
+  ]
+  public = [
+    "internal/path_util.h",
+    "internal/program_name.h",
+  ]
+  deps = [
+    "../strings",
+    "../synchronization",
+  ]
+  visibility = []
+  visibility += [ ":*" ]
+}
+
+source_set("config") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "usage_config.cc",
+  ]
+  public = [
+    "config.h",
+    "usage_config.h",
+  ]
+  deps = [
+    ":internal",
+    "../base:core_headers",
+    "../strings",
+    "../synchronization",
+  ]
+}
+
+source_set("marshalling") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "marshalling.cc",
+  ]
+  public = [
+    "marshalling.h",
+  ]
+  deps = [
+    "../base:core_headers",
+    "../strings",
+    "../strings:str_format",
+  ]
+}
+
+source_set("handle") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "internal/commandlineflag.cc",
+  ]
+  public = [
+    "internal/commandlineflag.h",
+  ]
+  deps = [
+    ":config",
+    ":marshalling",
+    "../base",
+    "../base:core_headers",
+    "../strings",
+    "../synchronization",
+    "../types:optional",
+  ]
+  visibility = []
+  visibility += [ ":*" ]
+}
+
+source_set("registry") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "internal/registry.cc",
+    "internal/type_erased.cc",
+  ]
+  public = [
+    "internal/registry.h",
+    "internal/type_erased.h",
+  ]
+  deps = [
+    ":config",
+    ":handle",
+    "../base",
+    "../base:core_headers",
+    "../base:dynamic_annotations",
+    "../strings",
+    "../synchronization",
+  ]
+  visibility = []
+  visibility += [ ":*" ]
+}
+
+source_set("flag") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "flag.cc",
+  ]
+  public = [
+    "declare.h",
+    "flag.h",
+    "internal/flag.h",
+  ]
+  deps = [
+    ":config",
+    ":handle",
+    ":marshalling",
+    ":registry",
+    "../base",
+    "../base:core_headers",
+    "../strings",
+  ]
+}
+
+source_set("usage") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "internal/usage.cc",
+  ]
+  public = [
+    "internal/usage.h",
+  ]
+  deps = [
+    ":config",
+    ":flag",
+    ":handle",
+    ":internal",
+    "../strings",
+    "../synchronization",
+  ]
+  visibility = []
+  visibility += [ ":*" ]
+}
+
+source_set("parse") {
+  testonly = true
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/abseil-cpp:absl_default_cflags_cc",
+  ]
+  public_configs = [ "//third_party/abseil-cpp:absl_include_config" ]
+  sources = [
+    "parse.cc",
+  ]
+  public = [
+    "internal/parse.h",
+    "parse.h",
+  ]
+  deps = [
+    ":config",
+    ":flag",
+    ":handle",
+    ":internal",
+    ":registry",
+    ":usage",
+    "../strings",
+    "../synchronization",
+  ]
+}

third_party/abseil-cpp/absl/flags/CMakeLists.txt

+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+  NAME
+    flags_internal
+  SRCS
+    "internal/program_name.cc"
+  HDRS
+    "internal/path_util.h"
+    "internal/program_name.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::strings
+    absl::synchronization
+  PUBLIC
+)
+
+absl_cc_library(
+  NAME
+    flags_config
+  SRCS
+    "usage_config.cc"
+  HDRS
+    "config.h"
+    "usage_config.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_internal
+    absl::core_headers
+    absl::strings
+    absl::synchronization
+)
+
+absl_cc_library(
+  NAME
+    flags_marshalling
+  SRCS
+    "marshalling.cc"
+  HDRS
+    "marshalling.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::core_headers
+    absl::strings
+    absl::str_format
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+  NAME
+    flags_handle
+  SRCS
+    "internal/commandlineflag.cc"
+  HDRS
+    "internal/commandlineflag.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_config
+    absl::flags_marshalling
+    absl::base
+    absl::core_headers
+    absl::strings
+    absl::synchronization
+    absl::optional
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+  NAME
+    flags_registry
+  SRCS
+    "internal/registry.cc"
+    "internal/type_erased.cc"
+  HDRS
+    "internal/registry.h"
+    "internal/type_erased.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_config
+    absl::flags_handle
+    absl::base
+    absl::core_headers
+    absl::dynamic_annotations
+    absl::strings
+    absl::synchronization
+)
+
+absl_cc_library(
+  NAME
+    flags
+  SRCS
+    "flag.cc"
+  HDRS
+    "declare.h"
+    "flag.h"
+    "internal/flag.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_config
+    absl::flags_handle
+    absl::flags_marshalling
+    absl::flags_registry
+    absl::base
+    absl::core_headers
+    absl::strings
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+  NAME
+    flags_usage
+  SRCS
+    "internal/usage.cc"
+  HDRS
+    "internal/usage.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_config
+    absl::flags
+    absl::flags_handle
+    absl::flags_internal
+    absl::strings
+    absl::synchronization
+)
+
+absl_cc_library(
+  NAME
+    flags_parse
+  SRCS
+    "parse.cc"
+  HDRS
+    "internal/parse.h"
+    "parse.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  LINKOPTS
+    ${ABSL_DEFAULT_LINKOPTS}
+  DEPS
+    absl::flags_config
+    absl::flags
+    absl::flags_handle
+    absl::flags_internal
+    absl::flags_registry
+    absl::flags_usage
+    absl::strings
+    absl::synchronization
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+absl_cc_test(
+  NAME
+    flags_commandlineflag_test
+  SRCS
+    "internal/commandlineflag_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags
+    absl::flags_handle
+    absl::flags_registry
+    absl::memory
+    absl::strings
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_flag_test
+  SRCS
+    "flag_test.cc"
+    "flag_test_defs.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags
+    absl::strings
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_marshalling_test
+  SRCS
+    "marshalling_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags_marshalling
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_parse_test
+  SRCS
+    "parse_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags
+    absl::base
+    absl::flags_parse
+    absl::scoped_set_env
+    absl::span
+    absl::strings
+    gmock_main
+)
+
+absl_cc_test(
+  NAME
+    flags_path_util_test
+  SRCS
+    "internal/path_util_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags_internal
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_program_name_test
+  SRCS
+    "internal/program_name_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags_internal
+    absl::strings
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_type_erased_test
+  SRCS
+    "internal/type_erased_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags
+    absl::flags_registry
+    absl::memory
+    absl::strings
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_usage_config_test
+  SRCS
+    "usage_config_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags_config
+    absl::flags_internal
+    absl::strings
+    gtest_main
+)
+
+absl_cc_test(
+  NAME
+    flags_usage_test
+  SRCS
+    "internal/usage_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::flags_config
+    absl::flags
+    absl::flags_internal
+    absl::flags_parse
+    absl::flags_usage
+    absl::memory
+    absl::strings
+    gtest
+)

third_party/abseil-cpp/absl/flags/config.h

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_CONFIG_H_
+#define ABSL_FLAGS_CONFIG_H_
+
+// Determine if we should strip string literals from the Flag objects.
+#if !defined(ABSL_FLAGS_STRIP_NAMES)
+
+// Non-mobile linux platforms don't strip string literals.
+#if (defined(__linux__) || defined(__Fuchsia__)) && !defined(__ANDROID__)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+// So do Macs (not iOS or embedded Apple platforms).
+#elif defined(__APPLE__)
+#include <TargetConditionals.h>
+#if !TARGET_OS_IPHONE && !TARGET_OS_EMBEDDED
+#define ABSL_FLAGS_STRIP_NAMES 0
+#endif
+
+// And Windows.
+#elif defined(_WIN32)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+// And Myriad.
+#elif defined(__myriad2__)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+#endif
+#endif  // !defined(ABSL_FLAGS_STRIP_NAMES)
+
+#if ABSL_FLAGS_STRIP_NAMES
+#if !defined(ABSL_FLAGS_STRIP_HELP)
+#define ABSL_FLAGS_STRIP_HELP 1
+#endif
+#else
+#if !defined(ABSL_FLAGS_STRIP_HELP)
+#define ABSL_FLAGS_STRIP_HELP 0
+#endif
+#endif
+
+#endif  // ABSL_FLAGS_CONFIG_H_

third_party/abseil-cpp/absl/flags/declare.h

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: declare.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
+// `absl::Flag` for use within a translation unit. You should place this
+// declaration within the header file associated with the .cc file that defines
+// and owns the `Flag`.
+
+#ifndef ABSL_FLAGS_DECLARE_H_
+#define ABSL_FLAGS_DECLARE_H_
+
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace flags_internal {
+
+// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
+template <typename T>
+class Flag;
+
+}  // namespace flags_internal
+
+// Flag
+//
+// Forward declaration of the `absl::Flag` type for use in defining the macro.
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+
+}  // namespace absl
+
+// ABSL_DECLARE_FLAG()
+//
+// This macro is a convenience for declaring use of an `absl::Flag` within a
+// translation unit. This macro should be used within a header file to
+// declare usage of the flag within any .cc file including that header file.
+//
+// The ABSL_DECLARE_FLAG(type, name) macro expands to:
+//
+//   extern absl::Flag<type> FLAGS_name;
+#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
+
+#endif  // ABSL_FLAGS_DECLARE_H_

third_party/abseil-cpp/absl/flags/flag.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/flag.h"
+
+#include <cstring>
+
+namespace absl {
+
+// We want to validate the type mismatch between type definition and
+// declaration. The lock-free implementation does not allow us to do it,
+// so in debug builds we always use the slower implementation, which always
+// validates the type.
+#ifndef NDEBUG
+#define ABSL_FLAGS_ATOMIC_GET(T)                              \
+  T GetFlag(const absl::Flag<T>& flag) {                      \
+    T result;                                                 \
+    flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
+    return result;                                            \
+  }
+#else
+#define ABSL_FLAGS_ATOMIC_GET(T)                                            \
+  T GetFlag(const absl::Flag<T>& flag) {                                    \
+    const int64_t r = flag.internal.atomic.load(std::memory_order_acquire); \
+    if (r != flags_internal::CommandLineFlag::kAtomicInit) {                \
+      T t;                                                                  \
+      memcpy(&t, &r, sizeof(T));                                            \
+      return t;                                                             \
+    }                                                                       \
+    T result;                                                               \
+    flag.internal.Read(&result, &flags_internal::FlagOps<T>);               \
+    return result;                                                          \
+  }
+#endif
+
+ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_ATOMIC_GET)
+
+#undef ABSL_FLAGS_ATOMIC_GET
+
+}  // namespace absl

third_party/abseil-cpp/absl/flags/flag_test_defs.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file is used to test the mismatch of the flag type between definition
+// and declaration. These are definitions. flag_test.cc contains declarations.
+#include <string>
+#include "absl/flags/flag.h"
+
+ABSL_FLAG(int, mistyped_int_flag, 0, "");
+ABSL_FLAG(std::string, mistyped_string_flag, "", "");

third_party/abseil-cpp/absl/flags/internal/commandlineflag_test.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/commandlineflag.h"
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_cat.h"
+
+ABSL_FLAG(int, int_flag, 201, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt",
+          absl::StrCat("string_flag", " help"));
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class CommandLineFlagTest : public testing::Test {
+ protected:
+  void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
+  void TearDown() override { flag_saver_.reset(); }
+
+ private:
+  std::unique_ptr<flags::FlagSaver> flag_saver_;
+};
+
+TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
+  auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+  ASSERT_TRUE(flag_01);
+  EXPECT_EQ(flag_01->Name(), "int_flag");
+  EXPECT_EQ(flag_01->Help(), "int_flag help");
+  EXPECT_EQ(flag_01->Typename(), "");
+  EXPECT_TRUE(!flag_01->IsRetired());
+  EXPECT_TRUE(flag_01->IsOfType<int>());
+  EXPECT_TRUE(absl::EndsWith(
+      flag_01->Filename(),
+      "absl/flags/internal/commandlineflag_test.cc"));
+
+  auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+  ASSERT_TRUE(flag_02);
+  EXPECT_EQ(flag_02->Name(), "string_flag");
+  EXPECT_EQ(flag_02->Help(), "string_flag help");
+  EXPECT_EQ(flag_02->Typename(), "");
+  EXPECT_TRUE(!flag_02->IsRetired());
+  EXPECT_TRUE(flag_02->IsOfType<std::string>());
+  EXPECT_TRUE(absl::EndsWith(
+      flag_02->Filename(),
+      "absl/flags/internal/commandlineflag_test.cc"));
+
+  auto* flag_03 = flags::FindRetiredFlag("bool_retired_flag");
+
+  ASSERT_TRUE(flag_03);
+  EXPECT_EQ(flag_03->Name(), "bool_retired_flag");
+  EXPECT_EQ(flag_03->Help(), "");
+  EXPECT_EQ(flag_03->Typename(), "");
+  EXPECT_TRUE(flag_03->IsRetired());
+  EXPECT_TRUE(flag_03->IsOfType<bool>());
+  EXPECT_EQ(flag_03->Filename(), "RETIRED");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestValueAccessMethods) {
+  absl::SetFlag(&FLAGS_int_flag, 301);
+  auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+  ASSERT_TRUE(flag_01);
+  EXPECT_EQ(flag_01->CurrentValue(), "301");
+  EXPECT_EQ(flag_01->DefaultValue(), "201");
+
+  absl::SetFlag(&FLAGS_string_flag, "new_str_value");
+  auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+  ASSERT_TRUE(flag_02);
+  EXPECT_EQ(flag_02->CurrentValue(), "new_str_value");
+  EXPECT_EQ(flag_02->DefaultValue(), "dflt");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringCurrentValue) {
+  std::string err;
+
+  auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(flag_01->SetFromString("11", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(flag_01->SetFromString("-123", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(!flag_01->SetFromString("xyz", flags::SET_FLAGS_VALUE,
+                                      flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+  EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(!flag_01->SetFromString("A1", flags::SET_FLAGS_VALUE,
+                                      flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+  EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(flag_01->SetFromString("0x10", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
+  EXPECT_FALSE(flag_01->on_command_line);
+
+  EXPECT_TRUE(flag_01->SetFromString("011", flags::SET_FLAGS_VALUE,
+                                     flags::kCommandLine, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+  EXPECT_TRUE(flag_01->on_command_line);
+
+  EXPECT_TRUE(!flag_01->SetFromString("", flags::SET_FLAGS_VALUE,
+                                      flags::kProgrammaticChange, &err));
+  EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
+
+  auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+  EXPECT_TRUE(flag_02->SetFromString("xyz", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
+
+  EXPECT_TRUE(flag_02->SetFromString("", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringDefaultValue) {
+  std::string err;
+
+  auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+  EXPECT_TRUE(flag_01->SetFromString("111", flags::SET_FLAGS_DEFAULT,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(flag_01->DefaultValue(), "111");
+
+  auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+  EXPECT_TRUE(flag_02->SetFromString("abc", flags::SET_FLAGS_DEFAULT,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(flag_02->DefaultValue(), "abc");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringIfDefault) {
+  std::string err;
+
+  auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+  EXPECT_TRUE(flag_01->SetFromString("22", flags::SET_FLAG_IF_DEFAULT,
+                                     flags::kProgrammaticChange, &err))
+      << err;
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+
+  EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+  // EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
+
+  // Reset back to default value
+  EXPECT_TRUE(flag_01->SetFromString("201", flags::SET_FLAGS_VALUE,
+                                     flags::kProgrammaticChange, &err));
+
+  EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
+                                     flags::kProgrammaticChange, &err));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
+  // EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
+}
+
+}  // namespace

third_party/abseil-cpp/absl/flags/internal/flag.h

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_FLAG_H_
+#define ABSL_FLAGS_INTERNAL_FLAG_H_
+
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/registry.h"
+
+namespace absl {
+namespace flags_internal {
+
+// This is "unspecified" implementation of absl::Flag<T> type.
+template <typename T>
+class Flag {
+ public:
+  constexpr Flag(const char* name, const flags_internal::HelpGenFunc help_gen,
+                 const char* filename,
+                 const flags_internal::FlagMarshallingOpFn marshalling_op,
+                 const flags_internal::InitialValGenFunc initial_value_gen)
+      : internal(name, flags_internal::HelpText::FromFunctionPointer(help_gen),
+                 filename, &flags_internal::FlagOps<T>, marshalling_op,
+                 initial_value_gen,
+                 /*retired_arg=*/false, /*def_arg=*/nullptr,
+                 /*cur_arg=*/nullptr) {}
+
+  // Not copyable/assignable.
+  Flag(const Flag<T>&) = delete;
+  Flag<T>& operator=(const Flag<T>&) = delete;
+
+  absl::string_view Name() const { return internal.Name(); }
+  std::string Help() const { return internal.Help(); }
+  std::string Filename() const { return internal.Filename(); }
+
+  absl::flags_internal::CommandLineFlag internal;
+
+  void SetCallback(const flags_internal::FlagCallback mutation_callback) {
+    internal.SetCallback(mutation_callback);
+  }
+
+ private:
+  // TODO(rogeeff): add these validations once UnparseFlag invocation is fixed
+  // for built-in types and when we cleanup existing code from operating on
+  // forward declared types.
+  //  auto IsCopyConstructible(const T& v) -> decltype(T(v));
+  //  auto HasAbslParseFlag(absl::string_view in, T* dst, std::string* err)
+  //      -> decltype(AbslParseFlag(in, dst, GlobalStringADLGuard(err)));
+  //  auto HasAbslUnparseFlag(const T& v) -> decltype(AbslUnparseFlag(v));
+};
+
+// This class facilitates Flag object registration and tail expression-based
+// flag definition, for example:
+// ABSL_FLAG(int, foo, 42, "Foo help").OnUpdate(NotifyFooWatcher);
+template <typename T, bool do_register>
+class FlagRegistrar {
+ public:
+  explicit FlagRegistrar(Flag<T>* flag) : flag_(flag) {
+    if (do_register) flags_internal::RegisterCommandLineFlag(&flag_->internal);
+  }
+
+  FlagRegistrar& OnUpdate(flags_internal::FlagCallback cb) && {
+    flag_->SetCallback(cb);
+    return *this;
+  }
+
+  // Make the registrar "die" gracefully as a bool on a line where registration
+  // happens. Registrar objects are intended to live only as temporary.
+  operator bool() const { return true; }  // NOLINT
+
+ private:
+  Flag<T>* flag_;  // Flag being registered (not owned).
+};
+
+// This struct and corresponding overload to MakeDefaultValue are used to
+// facilitate usage of {} as default value in ABSL_FLAG macro.
+struct EmptyBraces {};
+
+template <typename T>
+T* MakeFromDefaultValue(T t) {
+  return new T(std::move(t));
+}
+
+template <typename T>
+T* MakeFromDefaultValue(EmptyBraces) {
+  return new T;
+}
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_FLAG_H_

third_party/abseil-cpp/absl/flags/internal/parse.h

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
+#define ABSL_FLAGS_INTERNAL_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/flags/declare.h"
+
+ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
+ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
+
+namespace absl {
+namespace flags_internal {
+
+enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
+enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
+enum class OnUndefinedFlag {
+  kIgnoreUndefined,
+  kReportUndefined,
+  kAbortIfUndefined
+};
+
+std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
+                                        ArgvListAction arg_list_act,
+                                        UsageFlagsAction usage_flag_act,
+                                        OnUndefinedFlag on_undef_flag);
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_PARSE_H_

third_party/abseil-cpp/absl/flags/internal/path_util.h

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace flags_internal {
+
+// A portable interface that returns the basename of the filename passed as an
+// argument. It is similar to basename(3)
+// <https://linux.die.net/man/3/basename>.
+// For example:
+//     flags_internal::Basename("a/b/prog/file.cc")
+// returns "file.cc"
+//     flags_internal::Basename("file.cc")
+// returns "file.cc"
+inline absl::string_view Basename(absl::string_view filename) {
+  auto last_slash_pos = filename.find_last_of("/\\");
+
+  return last_slash_pos == absl::string_view::npos
+             ? filename
+             : filename.substr(last_slash_pos + 1);
+}
+
+// A portable interface that returns the directory name of the filename
+// passed as an argument, including the trailing slash.
+// Returns the empty string if a slash is not found in the input file name.
+// For example:
+//      flags_internal::Package("a/b/prog/file.cc")
+// returns "a/b/prog/"
+//      flags_internal::Package("file.cc")
+// returns ""
+inline absl::string_view Package(absl::string_view filename) {
+  auto last_slash_pos = filename.find_last_of("/\\");
+
+  return last_slash_pos == absl::string_view::npos
+             ? absl::string_view()
+             : filename.substr(0, last_slash_pos + 1);
+}
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_

third_party/abseil-cpp/absl/flags/internal/path_util_test.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/path_util.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestBasename) {
+  EXPECT_EQ(flags::Basename(""), "");
+  EXPECT_EQ(flags::Basename("a.cc"), "a.cc");
+  EXPECT_EQ(flags::Basename("dir/a.cc"), "a.cc");
+  EXPECT_EQ(flags::Basename("dir1/dir2/a.cc"), "a.cc");
+  EXPECT_EQ(flags::Basename("../dir1/dir2/a.cc"), "a.cc");
+  EXPECT_EQ(flags::Basename("/dir1/dir2/a.cc"), "a.cc");
+  EXPECT_EQ(flags::Basename("/dir1/dir2/../dir3/a.cc"), "a.cc");
+}
+
+// --------------------------------------------------------------------
+
+TEST(FlagsPathUtilTest, TestPackage) {
+  EXPECT_EQ(flags::Package(""), "");
+  EXPECT_EQ(flags::Package("a.cc"), "");
+  EXPECT_EQ(flags::Package("dir/a.cc"), "dir/");
+  EXPECT_EQ(flags::Package("dir1/dir2/a.cc"), "dir1/dir2/");
+  EXPECT_EQ(flags::Package("../dir1/dir2/a.cc"), "../dir1/dir2/");
+  EXPECT_EQ(flags::Package("/dir1/dir2/a.cc"), "/dir1/dir2/");
+  EXPECT_EQ(flags::Package("/dir1/dir2/../dir3/a.cc"), "/dir1/dir2/../dir3/");
+}
+
+}  // namespace

third_party/abseil-cpp/absl/flags/internal/program_name.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include <string>
+
+#include "absl/flags/internal/path_util.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+namespace flags_internal {
+
+ABSL_CONST_INIT static absl::Mutex program_name_guard(absl::kConstInit);
+ABSL_CONST_INIT static std::string* program_name
+    ABSL_GUARDED_BY(program_name_guard) = nullptr;
+
+std::string ProgramInvocationName() {
+  absl::MutexLock l(&program_name_guard);
+
+  return program_name ? *program_name : "UNKNOWN";
+}
+
+std::string ShortProgramInvocationName() {
+  absl::MutexLock l(&program_name_guard);
+
+  return program_name ? std::string(flags_internal::Basename(*program_name))
+                      : "UNKNOWN";
+}
+
+void SetProgramInvocationName(absl::string_view prog_name_str) {
+  absl::MutexLock l(&program_name_guard);
+
+  if (!program_name)
+    program_name = new std::string(prog_name_str);
+  else
+    program_name->assign(prog_name_str.data(), prog_name_str.size());
+}
+
+}  // namespace flags_internal
+}  // namespace absl

third_party/abseil-cpp/absl/flags/internal/program_name.h

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+#define ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Program name
+
+namespace absl {
+namespace flags_internal {
+
+// Returns program invocation name or "UNKNOWN" if `SetProgramInvocationName()`
+// is never called. At the moment this is always set to argv[0] as part of
+// library initialization.
+std::string ProgramInvocationName();
+
+// Returns base name for program invocation name. For example, if
+//   ProgramInvocationName() == "a/b/mybinary"
+// then
+//   ShortProgramInvocationName() == "mybinary"
+std::string ShortProgramInvocationName();
+
+// Sets program invocation name to a new value. Should only be called once
+// during program initialization, before any threads are spawned.
+void SetProgramInvocationName(absl::string_view prog_name_str);
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_

third_party/abseil-cpp/absl/flags/internal/program_name_test.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include "gtest/gtest.h"
+#include "absl/strings/match.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestInitialProgamName) {
+  flags::SetProgramInvocationName("absl/flags/program_name_test");
+  std::string program_name = flags::ProgramInvocationName();
+  for (char& c : program_name)
+    if (c == '\\') c = '/';
+
+#if !defined(__wasm__) && !defined(__asmjs__)
+  const std::string expect_name = "absl/flags/program_name_test";
+  const std::string expect_basename = "program_name_test";
+#else
+  // For targets that generate javascript or webassembly the invocation name
+  // has the special value below.
+  const std::string expect_name = "this.program";
+  const std::string expect_basename = "this.program";
+#endif
+
+  EXPECT_TRUE(absl::EndsWith(program_name, expect_name)) << program_name;
+  EXPECT_EQ(flags::ShortProgramInvocationName(), expect_basename);
+}
+
+TEST(FlagsPathUtilTest, TestProgamNameInterfaces) {
+  flags::SetProgramInvocationName("a/my_test");
+
+  EXPECT_EQ(flags::ProgramInvocationName(), "a/my_test");
+  EXPECT_EQ(flags::ShortProgramInvocationName(), "my_test");
+
+  absl::string_view not_null_terminated("absl/aaa/bbb");
+  not_null_terminated = not_null_terminated.substr(1, 10);
+
+  flags::SetProgramInvocationName(not_null_terminated);
+
+  EXPECT_EQ(flags::ProgramInvocationName(), "bsl/aaa/bb");
+  EXPECT_EQ(flags::ShortProgramInvocationName(), "bb");
+}
+
+}  // namespace

third_party/abseil-cpp/absl/flags/internal/registry.h

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_REGISTRY_H_
+#define ABSL_FLAGS_INTERNAL_REGISTRY_H_
+
+#include <functional>
+#include <map>
+#include <string>
+
+#include "absl/base/macros.h"
+#include "absl/flags/internal/commandlineflag.h"
+
+// --------------------------------------------------------------------
+// Global flags registry API.
+
+namespace absl {
+namespace flags_internal {
+
+// CommandLineFlagInfo holds all information for a flag.
+struct CommandLineFlagInfo {
+  std::string name;           // the name of the flag
+  std::string type;           // DO NOT use. Use flag->IsOfType<T>() instead.
+  std::string description;    // the "help text" associated with the flag
+  std::string current_value;  // the current value, as a std::string
+  std::string default_value;  // the default value, as a std::string
+  std::string filename;       // 'cleaned' version of filename holding the flag
+  bool has_validator_fn;  // true if RegisterFlagValidator called on this flag
+
+  bool is_default;  // true if the flag has the default value and
+                    // has not been set explicitly from the cmdline
+                    // or via SetCommandLineOption.
+
+  // nullptr for ABSL_FLAG.  A pointer to the flag's current value
+  // otherwise.  E.g., for DEFINE_int32(foo, ...), flag_ptr will be
+  // &FLAGS_foo.
+  const void* flag_ptr;
+};
+
+//-----------------------------------------------------------------------------
+
+void FillCommandLineFlagInfo(CommandLineFlag* flag,
+                             CommandLineFlagInfo* result);
+
+//-----------------------------------------------------------------------------
+
+CommandLineFlag* FindCommandLineFlag(absl::string_view name);
+CommandLineFlag* FindCommandLineV1Flag(const void* flag_ptr);
+CommandLineFlag* FindRetiredFlag(absl::string_view name);
+
+// Executes specified visitor for each non-retired flag in the registry.
+// Requires the caller hold the registry lock.
+void ForEachFlagUnlocked(std::function<void(CommandLineFlag*)> visitor);
+// Executes specified visitor for each non-retired flag in the registry. While
+// callback are executed, the registry is locked and can't be changed.
+void ForEachFlag(std::function<void(CommandLineFlag*)> visitor);
+
+//-----------------------------------------------------------------------------
+
+// Store the list of all flags in *OUTPUT, sorted by file.
+void GetAllFlags(std::vector<CommandLineFlagInfo>* OUTPUT);
+
+//-----------------------------------------------------------------------------
+
+bool RegisterCommandLineFlag(CommandLineFlag*, const void* ptr = nullptr);
+
+//-----------------------------------------------------------------------------
+// Retired registrations:
+//
+// Retired flag registrations are treated specially. A 'retired' flag is
+// provided only for compatibility with automated invocations that still
+// name it.  A 'retired' flag:
+//   - is not bound to a C++ FLAGS_ reference.
+//   - has a type and a value, but that value is intentionally inaccessible.
+//   - does not appear in --help messages.
+//   - is fully supported by _all_ flag parsing routines.
+//   - consumes args normally, and complains about type mismatches in its
+//     argument.
+//   - emits a complaint but does not die (e.g. LOG(ERROR)) if it is
+//     accessed by name through the flags API for parsing or otherwise.
+//
+// The registrations for a flag happen in an unspecified order as the
+// initializers for the namespace-scope objects of a program are run.
+// Any number of weak registrations for a flag can weakly define the flag.
+// One non-weak registration will upgrade the flag from weak to non-weak.
+// Further weak registrations of a non-weak flag are ignored.
+//
+// This mechanism is designed to support moving dead flags into a
+// 'graveyard' library.  An example migration:
+//
+//   0: Remove references to this FLAGS_flagname in the C++ codebase.
+//   1: Register as 'retired' in old_lib.
+//   2: Make old_lib depend on graveyard.
+//   3: Add a redundant 'retired' registration to graveyard.
+//   4: Remove the old_lib 'retired' registration.
+//   5: Eventually delete the graveyard registration entirely.
+//
+// Returns bool to enable use in namespace-scope initializers.
+// For example:
+//
+//   static const bool dummy = base::RetiredFlag<int32_t>("myflag");
+//
+// Or to declare several at once:
+//
+//   static bool dummies[] = {
+//       base::RetiredFlag<std::string>("some_string_flag"),
+//       base::RetiredFlag<double>("some_double_flag"),
+//       base::RetiredFlag<int32_t>("some_int32_flag")
+//   };
+
+// Retire flag with name "name" and type indicated by ops.
+bool Retire(FlagOpFn ops, FlagMarshallingOpFn marshalling_ops,
+            const char* name);
+
+// Registered a retired flag with name 'flag_name' and type 'T'.
+template <typename T>
+inline bool RetiredFlag(const char* flag_name) {
+  return flags_internal::Retire(flags_internal::FlagOps<T>,
+                                flags_internal::FlagMarshallingOps<T>,
+                                flag_name);
+}
+
+// If the flag is retired, returns true and indicates in |*type_is_bool|
+// whether the type of the retired flag is a bool.
+// Only to be called by code that needs to explicitly ignore retired flags.
+bool IsRetiredFlag(absl::string_view name, bool* type_is_bool);
+
+//-----------------------------------------------------------------------------
+// Saves the states (value, default value, whether the user has set
+// the flag, registered validators, etc) of all flags, and restores
+// them when the FlagSaver is destroyed.
+//
+// This class is thread-safe.  However, its destructor writes to
+// exactly the set of flags that have changed value during its
+// lifetime, so concurrent _direct_ access to those flags
+// (i.e. FLAGS_foo instead of {Get,Set}CommandLineOption()) is unsafe.
+
+class FlagSaver {
+ public:
+  FlagSaver();
+  ~FlagSaver();
+
+  FlagSaver(const FlagSaver&) = delete;
+  void operator=(const FlagSaver&) = delete;
+
+  // Prevents saver from restoring the saved state of flags.
+  void Ignore();
+
+ private:
+  class FlagSaverImpl* impl_;  // we use pimpl here to keep API steady
+};
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_REGISTRY_H_

third_party/abseil-cpp/absl/flags/internal/type_erased.cc

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/type_erased.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/flags/config.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+namespace flags_internal {
+
+bool GetCommandLineOption(absl::string_view name, std::string* value) {
+  if (name.empty()) return false;
+  assert(value);
+
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag == nullptr || flag->IsRetired()) {
+    return false;
+  }
+
+  absl::MutexLock l(InitFlagIfNecessary(flag));
+  *value = flag->CurrentValue();
+  return true;
+}
+
+bool GetCommandLineFlagInfo(absl::string_view name,
+                            CommandLineFlagInfo* OUTPUT) {
+  if (name.empty()) return false;
+
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag == nullptr || flag->IsRetired()) {
+    return false;
+  }
+
+  assert(OUTPUT);
+  FillCommandLineFlagInfo(flag, OUTPUT);
+  return true;
+}
+
+CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name) {
+  CommandLineFlagInfo info;
+  if (!GetCommandLineFlagInfo(name, &info)) {
+    ABSL_INTERNAL_LOG(FATAL, absl::StrCat("Flag '", name, "' does not exist"));
+  }
+  return info;
+}
+
+// --------------------------------------------------------------------
+
+bool SetCommandLineOption(absl::string_view name, absl::string_view value) {
+  return SetCommandLineOptionWithMode(name, value,
+                                      flags_internal::SET_FLAGS_VALUE);
+}
+
+bool SetCommandLineOptionWithMode(absl::string_view name,
+                                  absl::string_view value,
+                                  FlagSettingMode set_mode) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+
+  if (!flag || flag->IsRetired()) return false;
+
+  std::string error;
+  if (!flag->SetFromString(value, set_mode, kProgrammaticChange, &error)) {
+    // Errors here are all of the form: the provided name was a recognized
+    // flag, but the value was invalid (bad type, or validation failed).
+    flags_internal::ReportUsageError(error, false);
+    return false;
+  }
+
+  return true;
+}
+
+// --------------------------------------------------------------------
+
+bool IsValidFlagValue(absl::string_view name, absl::string_view value) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag == nullptr) {
+    return false;
+  }
+
+  if (flag->IsRetired()) {
+    return true;
+  }
+
+  // No need to lock the flag since we are not mutating it.
+  void* obj = Clone(flag->op, flag->def);
+  std::string ignored_error;
+  const bool result =
+      flags_internal::Parse(flag->marshalling_op, value, obj, &ignored_error) &&
+      Validate(flag, obj);
+  Delete(flag->op, obj);
+  return result;
+}
+
+// --------------------------------------------------------------------
+
+bool SpecifiedOnCommandLine(absl::string_view name) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag != nullptr && !flag->IsRetired()) {
+    absl::MutexLock l(InitFlagIfNecessary(flag));
+    return flag->IsSpecifiedOnCommandLine();
+  }
+  return false;
+}
+
+}  // namespace flags_internal
+}  // namespace absl

third_party/abseil-cpp/absl/flags/internal/type_erased.h

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
+#define ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
+
+#include <string>
+
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/registry.h"
+
+// --------------------------------------------------------------------
+// Registry interfaces operating on type erased handles.
+
+namespace absl {
+namespace flags_internal {
+
+// If a flag named "name" exists, store its current value in *OUTPUT
+// and return true.  Else return false without changing *OUTPUT.
+// Thread-safe.
+bool GetCommandLineOption(absl::string_view name, std::string* value);
+
+// If a flag named "name" exists, store its information in *OUTPUT
+// and return true.  Else return false without changing *OUTPUT.
+// Thread-safe.
+bool GetCommandLineFlagInfo(absl::string_view name,
+                            CommandLineFlagInfo* OUTPUT);
+
+// Returns the CommandLineFlagInfo of the flagname.  exit() with an
+// error code if name not found.
+// Thread-safe.
+CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name);
+
+// Set the value of the flag named "name" to value.  If successful,
+// returns true.  If not successful (e.g., the flag was not found or
+// the value is not a valid value), returns false.
+// Thread-safe.
+bool SetCommandLineOption(absl::string_view name, absl::string_view value);
+
+bool SetCommandLineOptionWithMode(absl::string_view name,
+                                  absl::string_view value,
+                                  FlagSettingMode set_mode);
+
+//-----------------------------------------------------------------------------
+
+// Returns true iff all of the following conditions are true:
+// (a) "name" names a registered flag
+// (b) "value" can be parsed succesfully according to the type of the flag
+// (c) parsed value passes any validator associated with the flag
+bool IsValidFlagValue(absl::string_view name, absl::string_view value);
+
+//-----------------------------------------------------------------------------
+
+// Returns true iff a flag named "name" was specified on the command line
+// (either directly, or via one of --flagfile or --fromenv or --tryfromenv).
+//
+// Any non-command-line modification of the flag does not affect the
+// result of this function.  So for example, if a flag was passed on
+// the command line but then reset via SET_FLAGS_DEFAULT, this
+// function will still return true.
+bool SpecifiedOnCommandLine(absl::string_view name);
+
+//-----------------------------------------------------------------------------
+
+// If a flag with specified "name" exists and has type T, store
+// its current value in *dst and return true.  Else return false
+// without touching *dst.  T must obey all of the requirements for
+// types passed to DEFINE_FLAG.
+template <typename T>
+inline bool GetByName(absl::string_view name, T* dst) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (!flag) return false;
+
+  if (auto val = flag->Get<T>()) {
+    *dst = *val;
+    return true;
+  }
+
+  return false;
+}
+
+}  // namespace flags_internal
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_

third_party/abseil-cpp/absl/flags/internal/type_erased_test.cc

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/type_erased.h"
+
+#include <cmath>
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+
+ABSL_FLAG(int, int_flag, 1, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt", "string_flag help");
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class TypeErasedTest : public testing::Test {
+ protected:
+  void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
+  void TearDown() override { flag_saver_.reset(); }
+
+ private:
+  std::unique_ptr<flags::FlagSaver> flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestGetCommandLineOption) {
+  std::string value;
+  EXPECT_TRUE(flags::GetCommandLineOption("int_flag", &value));
+  EXPECT_EQ(value, "1");
+
+  EXPECT_TRUE(flags::GetCommandLineOption("string_flag", &value));
+  EXPECT_EQ(value, "dflt");
+
+  EXPECT_FALSE(flags::GetCommandLineOption("bool_retired_flag", &value));
+
+  EXPECT_FALSE(flags::GetCommandLineOption("unknown_flag", &value));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOption) {
+  EXPECT_TRUE(flags::SetCommandLineOption("int_flag", "101"));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+  EXPECT_TRUE(flags::SetCommandLineOption("string_flag", "asdfgh"));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+  EXPECT_FALSE(flags::SetCommandLineOption("bool_retired_flag", "true"));
+
+  EXPECT_FALSE(flags::SetCommandLineOption("unknown_flag", "true"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_VALUE) {
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+                                                  flags::SET_FLAGS_VALUE));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+                                                  flags::SET_FLAGS_VALUE));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+                                                   flags::SET_FLAGS_VALUE));
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+                                                   flags::SET_FLAGS_VALUE));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAG_IF_DEFAULT) {
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+                                                  flags::SET_FLAG_IF_DEFAULT));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+  // This semantic is broken. We return true instead of false. Value is not
+  // updated.
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
+                                                  flags::SET_FLAG_IF_DEFAULT));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+                                                  flags::SET_FLAG_IF_DEFAULT));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+                                                   flags::SET_FLAG_IF_DEFAULT));
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+                                                   flags::SET_FLAG_IF_DEFAULT));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_DEFAULT) {
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+                                                  flags::SET_FLAGS_DEFAULT));
+
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+                                                  flags::SET_FLAGS_DEFAULT));
+  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+                                                   flags::SET_FLAGS_DEFAULT));
+
+  EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+                                                   flags::SET_FLAGS_DEFAULT));
+
+  // This should be successfull, since flag is still is not set
+  EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
+                                                  flags::SET_FLAG_IF_DEFAULT));
+  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 202);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestIsValidFlagValue) {
+  EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "57"));
+  EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "-101"));
+  EXPECT_FALSE(flags::IsValidFlagValue("int_flag", "1.1"));
+
+  EXPECT_TRUE(flags::IsValidFlagValue("string_flag", "#%^#%^$%DGHDG$W%adsf"));
+
+  EXPECT_TRUE(flags::IsValidFlagValue("bool_retired_flag", "true"));
+}
+
+}  // namespace

third_party/abseil-cpp/absl/flags/internal/usage.h

+//
+//  Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
+#define ABSL_FLAGS_INTERNAL_USAGE_H_
+
+#include <iosfwd>
+#include <string>
+
+#include "absl/flags/declare.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Usage reporting interfaces
+
+namespace absl {
+namespace flags_internal {
+
+// Sets the "usage" message to be used by help reporting routines.
+// For example:
+//  absl::SetProgramUsageMessage(
+//      absl::StrCat("This program does nothing.  Sample usage:\n", argv[0],
+//                   " <uselessarg1> <uselessarg2>"));
+// Do not include commandline flags in the usage: we do that for you!
+// Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
+void SetProgramUsageMessage(absl::string_view new_usage_message);
+
+// Returns the usage message set by SetProgramUsageMessage().
+absl::string_view ProgramUsageMessage();
+
+// --------------------------------------------------------------------
+
+// The format to report the help messages in.
+enum class HelpFormat {
+  kHumanReadable,
+};
+
+// Outputs the help message describing specific flag.
+void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag,
+              HelpFormat format = HelpFormat::kHumanReadable);
+
+// Produces the help messages for all flags matching the filter. A flag matches
+// the filter if it is defined in a file with a filename which includes
+// filter string as a substring. You can use '/' and '.' to restrict the
+// matching to a specific file names. For example:
+//   FlagsHelp(out, "/path/to/file.");
+// restricts help to only flags which resides in files named like:
+//  .../path/to/file.<ext>
+// for any extension 'ext'. If the filter is empty this function produces help
+// messages for all flags.
+void FlagsHelp(std::ostream& out, absl::string_view filter = {},
+               HelpFormat format = HelpFormat::kHumanReadable);
+
+// --------------------------------------------------------------------
+
+// If any of the 'usage' related command line flags (listed on the bottom of
+// this file) has been set this routine produces corresponding help message in
+// the specified output stream and returns:
+//  0 - if "version" or "only_check_flags" flags were set and handled.
+//  1 - if some other 'usage' related flag was set and handled.
+// -1 - if no usage flags were set on a commmand line.
+// Non negative return values are expected to be used as an exit code for a
+// binary.
+int HandleUsageFlags(std::ostream& out);
+
+}  // namespace flags_internal
+}  // namespace absl
+
+ABSL_DECLARE_FLAG(bool, help);
+ABSL_DECLARE_FLAG(bool, helpfull);
+ABSL_DECLARE_FLAG(bool, helpshort);
+ABSL_DECLARE_FLAG(bool, helppackage);
+ABSL_DECLARE_FLAG(bool, version);
+ABSL_DECLARE_FLAG(bool, only_check_args);
+ABSL_DECLARE_FLAG(std::string, helpon);
+ABSL_DECLARE_FLAG(std::string, helpmatch);
+
+#endif  // ABSL_FLAGS_INTERNAL_USAGE_H_

third_party/abseil-cpp/absl/flags/parse.h

+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: parse.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main parsing function for Abseil flags:
+// `absl::ParseCommandLine()`.
+
+#ifndef ABSL_FLAGS_PARSE_H_
+#define ABSL_FLAGS_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/flags/internal/parse.h"
+
+namespace absl {
+
+// ParseCommandLine()
+//
+// Parses the set of command-line arguments passed in the `argc` (argument
+// count) and `argv[]` (argument vector) parameters from `main()`, assigning
+// values to any defined Abseil flags. (Any arguments passed after the
+// flag-terminating delimiter (`--`) are treated as positional arguments and
+// ignored.)
+//
+// Any command-line flags (and arguments to those flags) are parsed into Abseil
+// Flag values, if those flags are defined. Any undefined flags will either
+// return an error, or be ignored if that flag is designated using `undefok` to
+// indicate "undefined is OK."
+//
+// Any command-line positional arguments not part of any command-line flag (or
+// arguments to a flag) are returned in a vector, with the program invocation
+// name at position 0 of that vector. (Note that this includes positional
+// arguments after the flag-terminating delimiter `--`.)
+//
+// After all flags and flag arguments are parsed, this function looks for any
+// built-in usage flags (e.g. `--help`), and if any were specified, it reports
+// help messages and then exits the program.
+std::vector<char*> ParseCommandLine(int argc, char* argv[]);
+
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_PARSE_H_

third_party/abseil-cpp/absl/hash/BUILD.bazel

@@ -35,10 +35,10 @@ cc_library(
     copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
+        ":city",
         "//absl/base:core_headers",
         "//absl/base:endian",
         "//absl/container:fixed_array",
-        "//absl/hash:city",
         "//absl/meta:type_traits",
         "//absl/numeric:int128",
         "//absl/strings",

third_party/abseil-cpp/absl/hash/hash.h

@@ -42,23 +42,28 @@
 //
 // Example:
 //
-//   // Suppose we have a class `Circle` for which we want to add hashing
+//   // Suppose we have a class `Circle` for which we want to add hashing:
 //   class Circle {
-//     public:
-//       ...
-//     private:
-//       std::pair<int, int> center_;
-//       int radius_;
-//     };
-//
-//   // To add hashing support to `Circle`, we simply need to add an ordinary
-//   // function `AbslHashValue()`, and return the combined hash state of the
-//   // existing hash state and the class state:
+//    public:
+//     ...
+//    private:
+//     std::pair<int, int> center_;
+//     int radius_;
+//   };
 //
+//   // To add hashing support to `Circle`, we simply need to add a free
+//   // (non-member) function `AbslHashValue()`, and return the combined hash
+//   // state of the existing hash state and the class state. You can add such a
+//   // free function using a friend declaration within the body of the class:
+//   class Circle {
+//    public:
+//     ...
 //     template <typename H>
 //     friend H AbslHashValue(H h, const Circle& c) {
 //       return H::combine(std::move(h), c.center_, c.radius_);
 //     }
+//     ...
+//   };
 //
 // For more information, see Adding Type Support to `absl::Hash` below.
 //
@@ -239,7 +244,7 @@ using Hash = absl::hash_internal::Hash<T>;
 //     }
 //    private:
 //     virtual void HashValue(absl::HashState state) const = 0;
-//  };
+//   };
 //
 //   class Impl : Interface {
 //    private:

third_party/abseil-cpp/absl/strings/str_cat.h

@@ -56,6 +56,7 @@
 #include <cstdint>
 #include <string>
 #include <type_traits>
+#include <vector>
 
 #include "absl/base/port.h"
 #include "absl/strings/numbers.h"
@@ -268,6 +269,17 @@ class AlphaNum {
   AlphaNum(T e)  // NOLINT(runtime/explicit)
       : AlphaNum(static_cast<typename std::underlying_type<T>::type>(e)) {}
 
+  // vector<bool>::reference and const_reference require special help to
+  // convert to `AlphaNum` because it requires two user defined conversions.
+  template <
+      typename T,
+      typename std::enable_if<
+          std::is_class<T>::value &&
+          (std::is_same<T, std::vector<bool>::reference>::value ||
+           std::is_same<T, std::vector<bool>::const_reference>::value)>::type* =
+          nullptr>
+  AlphaNum(T e) : AlphaNum(static_cast<bool>(e)) {}  // NOLINT(runtime/explicit)
+
  private:
   absl::string_view piece_;
   char digits_[numbers_internal::kFastToBufferSize];

third_party/abseil-cpp/absl/strings/str_cat_test.cc

@@ -18,6 +18,7 @@
 
 #include <cstdint>
 #include <string>
+#include <vector>
 
 #include "gtest/gtest.h"
 #include "absl/strings/substitute.h"
@@ -395,6 +396,18 @@ TEST(StrAppend, Basics) {
             "No limit thanks to C++11's variadic templates");
 }
 
+TEST(StrCat, VectorBoolReferenceTypes) {
+  std::vector<bool> v;
+  v.push_back(true);
+  v.push_back(false);
+  std::vector<bool> const& cv = v;
+  // Test that vector<bool>::reference and vector<bool>::const_reference
+  // are handled as if the were really bool types and not the proxy types
+  // they really are.
+  std::string result = absl::StrCat(v[0], v[1], cv[0], cv[1]); // NOLINT
+  EXPECT_EQ(result, "1010");
+}
+
 #ifdef GTEST_HAS_DEATH_TEST
 TEST(StrAppend, Death) {
   std::string s = "self";

third_party/abseil-cpp/absl/types/optional.h

@@ -507,7 +507,7 @@ class optional : private optional_internal::optional_data<T>,
   template <typename U>
   T value_or(U&& v) && {  // NOLINT(build/c++11)
     static_assert(std::is_move_constructible<value_type>::value,
-                  "optional<T>::value_or: T must by copy constructible");
+                  "optional<T>::value_or: T must by move constructible");
     static_assert(std::is_convertible<U&&, value_type>::value,
                   "optional<T>::value_or: U must be convertible to T");
     return static_cast<bool>(*this) ? std::move(**this)