clang: Build in C++11 mode on linux & cros too.

But: Not yet on Android, not yet with asan, not yet with gcc.
Only with clang, and only for linux & cros (in addition to mac,
which has had this for a while).

BUG=233330,233464

Review URL: https://codereview.chromium.org/11468005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@195090 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2928,19 +2928,12 @@
           ['clang==1', {
             'cflags': [
               '-Wheader-hygiene',
-              # Clang spots more unused functions.
-              '-Wno-unused-function',
+
               # Don't die on dtoa code that uses a char as an array index.
               '-Wno-char-subscripts',
-              # Especially needed for gtest macros using enum values from Mac
-              # system headers.
-              # TODO(pkasting): In C++11 this is legal, so this should be
-              # removed when we change to that.  (This is also why we don't
-              # bother fixing all these cases today.)
-              '-Wno-unnamed-type-template-args',
-              # This (rightfully) complains about 'override', which we use
-              # heavily.
-              '-Wno-c++11-extensions',
+
+              # Clang spots more unused functions.
+              '-Wno-unused-function',
 
               # Warns on switches on enums that cover all enum values but
               # also contain a default: branch. Chrome is full of that.
@@ -2954,6 +2947,43 @@
               '-mfpmath=sse',
             ],
           }],
+          ['clang==1 and (OS!="android" and asan!=1)', {
+            # Turn on C++11.
+            'cflags': [
+              # This warns on using ints as initializers for floats in
+              # initializer lists (e.g. |int a = f(); CGSize s = { a, a };|),
+              # which happens in several places in chrome code. Not sure if
+              # this is worth fixing.
+              '-Wno-c++11-narrowing',
+
+              # This warns about code like |"0x%08"NACL_PRIxPTR| -- with C++11
+              # user-defined literals, this is now a string literal with a UD
+              # suffix. However, this is used heavily in NaCl code, so disable
+              # the warning for now.
+              '-Wno-reserved-user-defined-literal',
+            ],
+            'cflags_cc': [
+              # See the comment in the Mac section for what it takes to move
+              # this to -std=c++11.
+              '-std=gnu++11',
+            ],
+          }],
+          ['clang==1 and (OS=="android" or asan==1)', {
+            # Android uses gcc4.4, and clang isn't compatible with gcc4.4's
+            # libstdc++ in C++11 mode. So no C++11 mode for Android yet.
+            # Doesn't work with asan for some reason either: crbug.com/233464
+            'cflags': [
+              # Especially needed for gtest macros using enum values from Mac	
+              # system headers.	
+              # TODO(pkasting): In C++11 this is legal, so this should be	
+              # removed when we change to that.  (This is also why we don't	
+              # bother fixing all these cases today.)	
+              '-Wno-unnamed-type-template-args',	
+              # This (rightfully) complains about 'override', which we use	
+              # heavily.	
+              '-Wno-c++11-extensions',
+            ],
+          }],
           ['clang==1 and clang_use_chrome_plugins==1', {
             'cflags': [
               '<@(clang_chrome_plugins_flags)',
@@ -3563,6 +3593,7 @@
                 # Don't die on dtoa code that uses a char as an array index.
                 # This is required solely for base/third_party/dmg_fp/dtoa.cc.
                 '-Wno-char-subscripts',
+
                 # Clang spots more unused functions.
                 '-Wno-unused-function',