Re-enable various MSVC warnings.

BUG=81439
TEST=none

Review URL: https://codereview.chromium.org/415773009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285730 0039d316-1c4b-4281-b951-d872f2087c98

base/allocator/allocator_unittest.cc

@@ -287,6 +287,13 @@ static void TestCalloc(size_t n, size_t s, bool ok) {
   }
 }
 
+// MSVC C4530 complains about exception handler usage when exceptions are
+// disabled.  Temporarily disable that warning so we can test that they are, in
+// fact, disabled.
+#if defined(OS_WIN)
+#pragma warning(push)
+#pragma warning(disable: 4530)
+#endif
 
 // A global test counter for number of times the NewHandler is called.
 static int news_handled = 0;
@@ -331,6 +338,10 @@ static void TestNothrowNew(void* (*func)(size_t)) {
   std::set_new_handler(saved_handler);
 }
 
+#if defined(OS_WIN)
+#pragma warning(pop)
+#endif
+
 }  // namespace
 
 //-----------------------------------------------------------------------------

build/common.gypi

@@ -5251,11 +5251,60 @@
         ],
         'msvs_cygwin_shell': 0,
         'msvs_disabled_warnings': [
-          4351, 4355, 4396, 4503, 4819,
+          # C4127: conditional expression is constant
+          # This warning can in theory catch dead code and other problems, but
+          # triggers in far too many desirable cases where the conditional
+          # expression is either set by macros or corresponds some legitimate
+          # compile-time constant expression (due to constant template args,
+          # conditionals comparing the sizes of different types, etc.).  Some of
+          # these can be worked around, but it's not worth it.
+          4127,
+
+          # C4351: new behavior: elements of array 'array' will be default
+          #        initialized
+          # This is a silly "warning" that basically just alerts you that the
+          # compiler is going to actually follow the language spec like it's
+          # supposed to, instead of not following it like old buggy versions
+          # did.  There's absolutely no reason to turn this on.
+          4351,
+
+          # C4355: 'this': used in base member initializer list
+          # It's commonly useful to pass |this| to objects in a class'
+          # initializer list.  While this warning can catch real bugs, most of
+          # the time the constructors in question don't attempt to call methods
+          # on the passed-in pointer (until later), and annotating every legit
+          # usage of this is simply more hassle than the warning is worth.
+          4355,
+
+          # C4503: 'identifier': decorated name length exceeded, name was
+          #        truncated
+          # This only means that some long error messages might have truncated
+          # identifiers in the presence of lots of templates.  It has no effect
+          # on program correctness and there's no real reason to waste time
+          # trying to prevent it.
+          4503,
+          
+          # C4611: interaction between 'function' and C++ object destruction is
+          #        non-portable
+          # This warning is unavoidable when using e.g. setjmp/longjmp.  MSDN
+          # suggests using exceptions instead of setjmp/longjmp for C++, but
+          # Chromium code compiles without exception support.  We therefore have
+          # to use setjmp/longjmp for e.g. JPEG decode error handling, which
+          # means we have to turn off this warning (and be careful about how
+          # object destruction happens in such cases).
+          4611,
+
           # TODO(maruel): These warnings are level 4. They will be slowly
           # removed as code is fixed.
-          4100, 4121, 4125, 4127, 4130, 4131, 4189, 4201, 4238, 4244, 4245,
-          4310, 4428, 4481, 4505, 4510, 4512, 4530, 4610, 4611, 4701, 4706,
+          4100, # Unreferenced formal parameter
+          4121, # Alignment of a member was sensitive to packing
+          4189, # Local variable is initialized but not referenced
+          4244, # Conversion from 'type1' to 'type2', possible loss of data
+          4481, # Nonstandard extension used: override specifier 'keyword'
+          4505, # Unreferenced local function has been removed
+          4510, # Default constructor could not be generated
+          4512, # Assignment operator could not be generated
+          4610, # Object can never be instantiated
         ],
         'msvs_settings': {
           'VCCLCompilerTool': {

build/config/compiler/BUILD.gn

@@ -563,38 +563,70 @@ config("no_rtti") {
 
 config("default_warnings") {
   if (is_win) {
-    # Please keep ordered and add names if you add more.
     cflags = [
       "/WX",      # Treat warnings as errors.
-      "/wd4018",  # Comparing signed and unsigned values.
+
+      # Warnings permanently disabled:
+
+      # C4127: conditional expression is constant
+      # This warning can in theory catch dead code and other problems, but
+      # triggers in far too many desirable cases where the conditional
+      # expression is either set by macros or corresponds some legitimate
+      # compile-time constant expression (due to constant template args,
+      # conditionals comparing the sizes of different types, etc.).  Some of
+      # these can be worked around, but it's not worth it.
+      "/wd4127",
+
+      # C4251: 'identifier' : class 'type' needs to have dll-interface to be
+      #        used by clients of class 'type2'
+      # This is necessary for the shared library build.
+      "/wd4251",
+
+      # C4351: new behavior: elements of array 'array' will be default
+      #        initialized
+      # This is a silly "warning" that basically just alerts you that the
+      # compiler is going to actually follow the language spec like it's
+      # supposed to, instead of not following it like old buggy versions did.
+      # There's absolutely no reason to turn this on.
+      "/wd4351",
+
+      # C4355: 'this': used in base member initializer list
+      # It's commonly useful to pass |this| to objects in a class' initializer
+      # list.  While this warning can catch real bugs, most of the time the
+      # constructors in question don't attempt to call methods on the passed-in
+      # pointer (until later), and annotating every legit usage of this is
+      # simply more hassle than the warning is worth.
+      "/wd4355",
+
+      # C4503: 'identifier': decorated name length exceeded, name was
+      #        truncated
+      # This only means that some long error messages might have truncated
+      # identifiers in the presence of lots of templates.  It has no effect on
+      # program correctness and there's no real reason to waste time trying to
+      # prevent it.
+      "/wd4503",
+
+      # C4611: interaction between 'function' and C++ object destruction is
+      #        non-portable
+      # This warning is unavoidable when using e.g. setjmp/longjmp.  MSDN
+      # suggests using exceptions instead of setjmp/longjmp for C++, but
+      # Chromium code compiles without exception support.  We therefore have to
+      # use setjmp/longjmp for e.g. JPEG decode error handling, which means we
+      # have to turn off this warning (and be careful about how object
+      # destruction happens in such cases).
+      "/wd4611",
+
+
+      # Warnings to evaluate and possibly fix/reenable later:
+
       "/wd4100",  # Unreferenced formal function parameter.
-      "/wd4121",  # Alignment of a member was sensitive to packing.
-      "/wd4125",  # Decimal digit terminates octal escape sequence.
-      "/wd4127",  # Conditional expression is constant.
-      "/wd4130",  # Logical operation on address of string constant.
       "/wd4189",  # A variable was declared and initialized but never used.
-      "/wd4201",  # Nonstandard extension used: nameless struct/union.
-      "/wd4238",  # Nonstandard extension used: class rvalue used as lvalue.
       "/wd4244",  # Conversion: possible loss of data.
-      "/wd4245",  # Conversion: signed/unsigned mismatch,
-      "/wd4251",  # Class needs to have dll-interface.
-      "/wd4310",  # Cast truncates constant value.
-      "/wd4351",  # Elements of array will be default initialized.
-      "/wd4355",  # 'this' used in base member initializer list.
-      "/wd4396",  # Inline friend template thing.
-      "/wd4428",  # Universal character name encountered in source.
       "/wd4481",  # Nonstandard extension: override specifier.
-      "/wd4503",  # Decorated name length exceeded, name was truncated.
       "/wd4505",  # Unreferenced local function has been removed.
       "/wd4510",  # Default constructor could not be generated.
       "/wd4512",  # Assignment operator could not be generated.
-      "/wd4530",  # Exception handler used, but unwind semantics not enabled.
       "/wd4610",  # Class can never be instantiated, constructor required.
-      "/wd4611",  # C++ object destruction and 'catch'.
-      "/wd4701",  # Potentially uninitialized local variable name used.
-      "/wd4702",  # Unreachable code.
-      "/wd4706",  # Assignment within conditional expression.
-      "/wd4819",  # Character not in the current code page.
     ]
   } else {
     # Common GCC warning setup.

components/nacl/renderer/ppb_nacl_private_impl.cc

@@ -590,13 +590,11 @@ PP_FileHandle CreateTemporaryFile(PP_Instance instance) {
 }
 
 int32_t GetNumberOfProcessors() {
-  int32_t num_processors;
   IPC::Sender* sender = content::RenderThread::Get();
   DCHECK(sender);
-  if(!sender->Send(new NaClHostMsg_NaClGetNumProcessors(&num_processors))) {
-    return 1;
-  }
-  return num_processors;
+  int32_t num_processors = 1;
+  return sender->Send(new NaClHostMsg_NaClGetNumProcessors(&num_processors)) ?
+      num_processors : 1;
 }
 
 PP_Bool PPIsNonSFIModeEnabled() {
@@ -787,15 +785,13 @@ void InstanceDestroyed(PP_Instance instance) {
 PP_Bool NaClDebugEnabledForURL(const char* alleged_nmf_url) {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableNaClDebug))
     return PP_FALSE;
-  bool should_debug;
   IPC::Sender* sender = content::RenderThread::Get();
   DCHECK(sender);
-  if(!sender->Send(new NaClHostMsg_NaClDebugEnabledForURL(
-         GURL(alleged_nmf_url),
-         &should_debug))) {
-    return PP_FALSE;
-  }
-  return PP_FromBool(should_debug);
+  bool should_debug = false;
+  return PP_FromBool(
+      sender->Send(new NaClHostMsg_NaClDebugEnabledForURL(GURL(alleged_nmf_url),
+                                                          &should_debug)) &&
+      should_debug);
 }
 
 void LogToConsole(PP_Instance instance, const char* message) {

device/bluetooth/bluetooth_service_record_win.cc

@@ -130,7 +130,7 @@ BluetoothServiceRecordWin::BluetoothServiceRecordWin(
       name_(name),
       uuid_(gatt_uuid),
       supports_rfcomm_(false),
-      rfcomm_channel_(-1) {
+      rfcomm_channel_(0xFF) {
   // Bluetooth 2.0
   if (sdp_bytes.size() > 0) {
     LPBYTE blob_data = const_cast<LPBYTE>(&sdp_bytes[0]);

gpu/gles2_conform_support/egl/config.cc

@@ -14,10 +14,10 @@ Config::Config()
       luminance_size_(0),
       alpha_size_(0),
       alpha_mask_size_(0),
-      bind_to_texture_rgb_(EGL_DONT_CARE),
-      bind_to_texture_rgba_(EGL_DONT_CARE),
+      bind_to_texture_rgb_(EGL_FALSE),
+      bind_to_texture_rgba_(EGL_FALSE),
       color_buffer_type_(EGL_RGB_BUFFER),
-      config_caveat_(EGL_DONT_CARE),
+      config_caveat_(EGL_NONE),
       config_id_(EGL_DONT_CARE),
       conformant_(EGL_OPENGL_ES2_BIT),
       depth_size_(0),
@@ -27,7 +27,7 @@ Config::Config()
       max_pbuffer_pixels_(0),
       min_swap_interval_(EGL_DONT_CARE),
       max_swap_interval_(EGL_DONT_CARE),
-      native_renderable_(EGL_DONT_CARE),
+      native_renderable_(EGL_TRUE),
       native_visual_id_(0),
       native_visual_type_(EGL_DONT_CARE),
       renderable_type_(EGL_OPENGL_ES2_BIT),