Revert of roll clang 254049:254793

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 4534 matching lines @@
               }],
             ],
           }],
           ['msan==1', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '-fsanitize=memory',
                   '-fsanitize-memory-track-origins=<(msan_track_origins)',
                   '-fsanitize-blacklist=<(msan_blacklist)',
+                  # TODO(eugenis): Remove when msan migrates to new ABI (crbug.com/560589).
+                  '-fPIC',
                 ],
                 'ldflags': [
                   '-fsanitize=memory',
+                  # TODO(eugenis): Remove when msan migrates to new ABI (crbug.com/560589).
+                  '-pie',
                 ],
                 'defines': [
                   'MEMORY_SANITIZER',
                 ],
               }],
             ],
           }],
           ['use_instrumented_libraries==1', {
             'dependencies': [
               '<(DEPTH)/third_party/instrumented_libraries/instrumented_libraries.gyp:instrumented_libraries',
@@ skipping 1795 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',
   },
 }