roll clang 176256:179138

build/common.gypi

 # Copyright (c) 2012 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 2947 matching lines @@
           ['clang==1 and clang_load!=""', {
             'cflags': [
               '-Xclang', '-load', '-Xclang', '<(clang_load)',
             ],
           }],
           ['clang==1 and clang_add_plugin!=""', {
             'cflags': [
               '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
             ],
           }],
+          ['clang==1 and target_arch=="ia32"', {
+            'cflags': [
+              # Else building libyuv gives clang's register allocator issues,
+              # see llvm.org/PR15798 / crbug.com/233709
+              '-momit-leaf-frame-pointer',
+            ],
+          }],
           ['clang==1 and "<(GENERATOR)"=="ninja"', {
             'cflags': [
               # See http://crbug.com/110262
               '-fcolor-diagnostics',
             ],
           }],
           # Common options for AddressSanitizer, ThreadSanitizer and
           # MemorySanitizer.
           ['asan==1 or tsan==1 or msan==1', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '-fno-omit-frame-pointer',
                   '-gline-tables-only',
                 ],
+                'ldflags!': [
+                  # Functions interposed by the sanitizers can make ld think
+                  # that some libraries aren't needed when they actually are,
+                  # http://crbug.com/234010. As workaround, disable --as-needed.
+                  '-Wl,--as-needed',
+                ],
               }],
             ],
           }],
           ['asan==1', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '-fsanitize=address',
                   '-w',  # http://crbug.com/162783
                 ],
@@ skipping 1268 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }