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..f5562fefb0bb837a98c6358ca9a77a363c2100dc 100644
--- a/build/mac/asan.gyp
+++ b/build/mac/asan.gyp
@@ -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"', {
@@ -21,11 +25,37 @@
              {
                'destination': '<(PRODUCT_DIR)',
                'files': [
-                 '<!(/bin/ls <(asan_rtl_mask_path))',
+                 '<!(/bin/ls <(asan_osx_dynamic))',

[Nico, 2014/04/05 18:40:18]

Out of curiosity, why do you need the call to ls?

[Alexander Potapenko, 2014/04/08 08:31:10]

IIUC 'copies' doesn't support wildcards, does it?

                ],
              },
            ],
          }],
+         # ASan works with iOS simulator only, not bare-metal iOS.
+         ['OS=="ios" and target_arch=="ia32"', {
+           'toolsets': ['host', 'target'],
+           'target_conditions': [

[Nico, 2014/04/05 18:40:18]

nit: I think you can move target_conditions inside the copies block, like

  'copies': [
    {
      'destination': '<(PRODUCT_DIR)'
      'target_conditions': [
        ['_toolset_=="host";, { 'files': [ 'asan_osx_dynamic'] }],
        ['_toolset_=="target";, { 'files': [ 'asan_iossim_dynamic'] }],
      ]
    }
  ]

Haven't tried it, though.

[Alexander Potapenko, 2014/04/08 08:31:10]

Done.

+             ['_toolset=="host"', {
+               'copies': [
+                 {
+                   'destination': '<(PRODUCT_DIR)',
+                   'files': [
+                     '<!(/bin/ls <(asan_osx_dynamic))',
+                   ],
+                 },
+               ],
+             }],
+             ['_toolset=="target"', {
+               'copies': [
+                 {
+                   'destination': '<(PRODUCT_DIR)',
+                   'files': [
+                     '<!(/bin/ls <(asan_iossim_dynamic))',
+                   ],
+                 },
+               ],
+             }],
+           ],
+         }],
        ],
      },
    ],