Start landing build support for Clang-style ASan on Windows

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index ddd6546f379437be9af2d050f59f8c5e0091df40..01ef244f8a967f3d64c089ffeb0c21135be87f42 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1080,7 +1080,7 @@
 
     # Clang stuff.
     'clang%': '<(clang)',
-    'make_clang_dir%': 'third_party/llvm-build/Release+Asserts',
+    'make_clang_dir%': '<!(python -c "import sys, os; print os.path.abspath(sys.argv[1])" <(DEPTH)/third_party/llvm-build/Release+Asserts)',

[Timur Iskhodzhanov, 2014/02/13 09:18:30]

Maybe want to add a comment explaining why absolute paths are needed.

 
     # These two variables can be set in GYP_DEFINES while running
     # |gclient runhooks| to let clang run a plugin in every compilation.
@@ -1579,6 +1579,9 @@
             # Turn on multiple dll by default on Windows when in static_library.
             'chrome_multiple_dll%': 1,
           }],
+          ['clang==1 and asan==1', {
+            'win_use_allocator_shim%': 0,
+          }],
           ['component=="shared_library" and "<(GENERATOR)"=="ninja"', {
             # Only enabled by default for ninja because it's buggy in VS.
             # Not enabled for component=static_library because some targets
@@ -2321,8 +2324,8 @@
           'ENABLE_EGLIMAGE=1',
         ],
       }],
-      ['asan==1 and OS=="win"', {
-        # Since asan on windows uses Syzygy, we need /PROFILE turned on to
+      ['asan==1 and OS=="win" and clang!=1', {
+        # For SyzyAsan, we need /PROFILE turned on to
         # produce appropriate pdbs.
         'msvs_settings': {
           'VCLinkerTool': {
@@ -4727,6 +4730,31 @@
                 }],
               ],
             }],
+            ['clang==1 and asan==1', {
+              # Building with Clang on Windows is a work in progress and very
+              # experimental. See crbug.com/82385.
+              'VCCLCompilerTool': {
+                'AdditionalOptions': [
+                  '-fsanitize=address',
+                ],
+              },
+              'target_conditions': [
+                ['_type=="executable"', {
+                  'VCLinkerTool': {
+                    'AdditionalOptions': [
+                       '<(make_clang_dir)/lib/clang/3.5/lib/windows/clang_rt.asan-i386.lib',
+                    ],
+                  },
+                }],
+                ['_type=="shared_library" or _type=="loadable_module"', {
+                  'VCLinkerTool': {
+                    'AdditionalOptions': [
+                       '<(make_clang_dir)/lib/clang/3.5/lib/windows/clang_rt.asan_dll_thunk-i386.lib',
+                    ],
+                  },
+                }],
+              ],
+            }],
           ],
         },
       },