Link binaries targeting iOS simulator to the appropriate ASan dynamic runtime.

build/mac/asan.gyp

Index: build/mac/asan.gyp
diff --git a/build/mac/asan.gyp b/build/mac/asan.gyp
index 73e86416c6981ffffd6f9fa47985f16e6befffd3..91a36d2d4d9f667c53b82a656931e72b2f63985e 100644
--- a/build/mac/asan.gyp
+++ b/build/mac/asan.gyp
@@ -4,7 +4,7 @@
 
 {
    'targets': [
-     {
+     {   
        'target_name': 'asan_dynamic_runtime',
        'type': 'none',
        'variables': {
@@ -13,7 +13,11 @@
          'prune_self_dependency': 1,
          # Path is relative to this GYP file.
          'asan_rtl_mask_path':
-             '../../third_party/llvm-build/Release+Asserts/lib/clang/*/lib/darwin/libclang_rt.asan_osx_dynamic.dylib',
+             '../../third_party/llvm-build/Release+Asserts/lib/clang/*/lib/darwin',
+         'asan_osx_dynamic':
+             '<(asan_rtl_mask_path)/libclang_rt.asan_osx_dynamic.dylib',
+         'asan_iossim_dynamic':
+             '<(asan_rtl_mask_path)/libclang_rt.asan_iossim_dynamic.dylib',
        },
        'conditions': [
          ['OS=="mac"', {
@@ -21,12 +25,25 @@
              {
                'destination': '<(PRODUCT_DIR)',
                'files': [
-                 '<!(/bin/ls <(asan_rtl_mask_path))',
+                 '<!(/bin/ls <(asan_osx_dynamic))',
+               ],
+             },
+           ],
+         }],
+         # ASan works with iOS simulator only, not bare-metal iOS.
+         ['OS=="ios" and target_arch=="ia32"', {
+           'toolsets': ['host', 'target'],
+           'copies': [
+             {
+               'destination': '<(PRODUCT_DIR)',
+               'target_conditions': [
+                 ['_toolset=="host"', { 'files': [ 'asan_osx_dynamic'] }], 
+                 ['_toolset=="target"', { 'files': [ 'asan_iossim_dynamic'] }], 
                ],
              },
            ],
          }],
        ],
-     },
-   ],
+     },  
+   ],  
 }