Update build configuration to support iOS targets

Review URL: https://codereview.chromium.org/1130153009

Cr-Commit-Position: refs/heads/master@{#330643}

build/config/allocator.gni

@@ -3,7 +3,8 @@
 # found in the LICENSE file.
 
 # TODO(GYP): Make tcmalloc work on win.
-if (is_android || current_cpu == "mipsel" || is_mac || is_asan || is_win) {
+if (is_android || current_cpu == "mipsel" || is_mac || is_ios || is_asan ||
+    is_win) {
   _default_allocator = "none"
 } else {
   _default_allocator = "tcmalloc"

build/config/arm.gni

@@ -28,6 +28,11 @@ if (current_cpu == "arm") {
       arm_use_neon = false
       arm_optionally_use_neon = true
     }
+
+    if (is_ios) {
+      arm_use_neon = false
+      arm_optionally_use_neon = false
+    }
   }
 
   assert(arm_float_abi == "" || arm_float_abi == "hard" ||

build/config/compiler/BUILD.gn

@@ -125,7 +125,7 @@ config("compiler") {
     }
 
     # Linker warnings.
-    if (!(is_chromeos && current_cpu == "arm") && !is_mac) {
+    if (!(is_chromeos && current_cpu == "arm") && !is_mac && !is_ios) {
       # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
       ldflags += [ "-Wl,--fatal-warnings" ]
     }
@@ -186,6 +186,11 @@ config("compiler") {
         "-arch",
         "i386",
       ]
+    } else if (current_cpu == "arm") {
+      common_mac_flags += [
+        "-arch",
+        "armv7",
+      ]
     }
 
     cflags += common_mac_flags
@@ -493,7 +498,7 @@ config("compiler") {
 }
 
 config("compiler_arm_fpu") {
-  if (current_cpu == "arm") {
+  if (current_cpu == "arm" && !is_ios) {
     cflags = [ "-mfpu=$arm_fpu" ]
   }
 }

build/config/ios/BUILD.gn

@@ -11,12 +11,12 @@ config("sdk") {
     sysroot,
   ]
 
-  cflags = common_flags
-  ldflags = common_flags
-
   if (use_ios_simulator) {
-    cflags += [ "-mios-simulator-version-min=$ios_deployment_target" ]
+    common_flags += [ "-mios-simulator-version-min=$ios_deployment_target" ]
   } else {
-    cflags += [ "-miphoneos-version-min=$ios_deployment_target" ]
+    common_flags += [ "-miphoneos-version-min=$ios_deployment_target" ]
   }
+
+  cflags = common_flags
+  ldflags = common_flags
 }