Add experimental support for compiling with clang and ASan on Linux.

build/standalone.gypi

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Definitions to be used when building stand-alone PDFium binaries.
 
 {
   'variables': {
     'component%': 'static_library',
+    'asan%': 0,
     'clang%': 0,
     'msvs_multi_core_compile%': '1',
     'variables': {
       'variables': {
         'variables': {
           'conditions': [
             ['OS=="linux" or OS=="mac"', {
               # This handles the Unix platforms we generally deal with.
               # Anything else gets passed through, which probably won't work
               # very well; such hosts should pass an explicit target_arch
@@ skipping 134 matching lines @@
       '-fvisibility=hidden',
     ],
     'cflags_cc': [
       '-std=gnu++0x',
       '-Wnon-virtual-dtor',
       '-fno-rtti',
     ],
     'ldflags': [
       '-pthread',
     ],
+    'conditions': [
+      ['asan==1', {
+        'cflags': [
+          '-fsanitize=address',
+          '-gline-tables-only',
+        ],
+        'ldflags': [
+          '-fsanitize=address',
+        ],
+      }],
+    ],
     'defines': [
       # Don't use deprecated V8 APIs anywhere.
       'V8_DEPRECATION_WARNINGS',
     ],
     'msvs_cygwin_dirs': ['<(DEPTH)/v8/third_party/cygwin'],
     'msvs_configuration_attributes': {
       'OutputDirectory': '<(DEPTH)\\build\\$(ConfigurationName)',
       'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
       'CharacterSet': '1',
     },
@@ skipping 69 matching lines @@
         '-Wno-unused-parameter',
       ],
     },
   },
   'conditions': [
     ['component=="shared_library"', {
       'cflags': [
         '-fPIC',
       ],
     }],
+    ['OS=="linux"', {
+      'conditions': [
+        ['clang==1', {
+          'make_global_settings': [
+            ['CC', '<!(which clang)'],

[Nico, 2015/10/14 23:55:21]

Isn't it better if you deps in chromium's tools/clang/scripts and run update.sh
from a hooks and use that? (that's also what v8 does)

[Oliver Chang, 2015/10/15 01:00:49]

Ah I didn't know v8 does this, thanks! I got a little put off by the seamingly
chromium specific stuff in the script but it seems like it works nicely here as
well.

+            ['CXX', '<!(which clang++)'],
+          ],
+        }],
+      ],
+    }],  # OS=="linux"
     ['OS=="win"', {
       'target_defaults': {
         'defines': [
           'NOMINMAX',
           '_CRT_SECURE_NO_DEPRECATE',
           '_CRT_NONSTDC_NO_DEPRECATE',
         ],
         'conditions': [
           ['component=="static_library"', {
             'defines': [
@@ skipping 18 matching lines @@
           'V8_USE_EXTERNAL_STARTUP_DATA',
         ],
       },
     }],  # v8_use_external_startup_data==1
   ],
   'xcode_settings': {
     # See comment in Chromium's common.gypi for why this is needed.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   }
 }