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..8c6ed0ac4c7b73c99e9e06ebb0db39d4d9474222 100644
--- a/build/mac/asan.gyp
+++ b/build/mac/asan.gyp
@@ -13,19 +13,64 @@
          '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',
        },
+       'postbuilds': [
+         {
+           'variables': {
+             # Define copy_asan_dylib_path in a variable ending in
+             # _path so that gyp understands it's a path and
+             # performs proper relativization during dict merging.

[Nico, 2014/04/02 15:07:53]

Is this necessary? asan_dynamic_runtime is a regular target in a gyp file,
nothing in a gypi, so all paths in it should be relative to the folder
containing the gyp file (build/mac). So if you use the correct relative path,
you shouldn't need a variable.

+             'copy_asan_dylib_path':
+               'mac/copy_asan_runtime_dylib.sh',

[Nico, 2014/04/02 15:07:53]

This script checks if "${BUILT_PRODUCTS_DIR}/${EXECUTABLE_PATH}" exists and
exits if not. Since asan_dynamic_runtime is a type none target, this path will
never exit, and the postbuild won't do anything, as far as I understand.

What am I missing?

+           },
+           'postbuild_name': 'Copy ASan runtime dylib',
+           'action': [
+             '<(copy_asan_dylib_path)',
+           ],
+         },
+       ],
        'conditions': [
          ['OS=="mac"', {
            'copies': [
              {
                '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'],
+           'target_conditions': [
+             ['_toolset=="host"', {
+               'copies': [
+                 {
+                   'destination': '<(PRODUCT_DIR)',
+                   'files': [
+                     '<!(/bin/ls <(asan_osx_dynamic))',
+                   ],
+                 },
+               ],
+             }],
+             ['_toolset=="target"', {
+               'copies': [
+                 {
+                   'destination': '<(PRODUCT_DIR)',
+                   'files': [
+                     '<!(/bin/ls <(asan_iossim_dynamic))',
+                   ],
+                 },
+               ],
+             }],
+           ],
+         }],
        ],
      },
    ],