clang: Set clang-specific flags on linux only if the target compiler is used.

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1169 matching lines @@
               ['_toolset=="target"', {
                 'cflags': [
                   '--sysroot=<(sysroot)',
                 ],
                 'ldflags': [
                   '--sysroot=<(sysroot)',
                 ],
               }]]
           }],
           ['clang==1', {
-            'cflags': [
-              # 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',
-              # Survive EXPECT_EQ(unnamed_enum, unsigned int) -- see
-              # http://code.google.com/p/googletest/source/detail?r=446 .
-              # TODO(thakis): Use -isystem instead (http://crbug.com/58751 ).
-              '-Wno-unnamed-type-template-args',
-              # TODO(thakis): Turn on -- http://crbug.com/72205
-              '-Wno-overloaded-virtual',
-            ],
-            'cflags!': [
-              # Clang doesn't seem to know know this flag.
-              '-mfpmath=sse',
-            ],
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'cflags': [
+                  # 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',
+                  # Survive EXPECT_EQ(unnamed_enum, unsigned int) -- see
+                  # http://code.google.com/p/googletest/source/detail?r=446 .
+                  # TODO(thakis): Use -isystem instead (http://crbug.com/58751 )
+                  '-Wno-unnamed-type-template-args',
+                  # TODO(thakis): Turn on -- http://crbug.com/72205
+                  '-Wno-overloaded-virtual',
+                ],
+                'cflags!': [
+                  # Clang doesn't seem to know know this flag.
+                  '-mfpmath=sse',
+                ],
+              }]],
           }],
           ['clang==1 and clang_load!="" and clang_add_plugin!=""', {
-            'cflags': [
-              '-Xclang', '-load', '-Xclang', '<(clang_load)',
-              '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
-            ],
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'cflags': [
+                  '-Xclang', '-load', '-Xclang', '<(clang_load)',
+                  '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
+                ],
+              }]],
           }],
           ['no_strict_aliasing==1', {
             'cflags': [
               '-fno-strict-aliasing',
             ],
           }],
           ['linux_breakpad==1', {
             'cflags': [ '-g' ],
             'defines': ['USE_LINUX_BREAKPAD'],
           }],
@@ skipping 350 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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