Adding GYP_DEFINES=ASAN to enable ASAN build

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 9eb94f3b62828aa0d7dc85ee997c64c58eb56e2f..d6bed70263920b41de50d434d16ee3f0c7068330 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -180,6 +180,10 @@
       # Has no effect if 'clang' is not set as well.
       'clang_use_chrome_plugins%': 0,
 
+      # Enable building with ASAN.
+      # See https://sites.google.com/a/chromium.org/dev/developers/testing/addresssanitizer
+      'asan%': 0,
+
       # Set to 1 compile with -fPIC cflag on linux. This is a must for shared
       # libraries on linux x86-64 and arm, plus ASLR.
       'linux_fpic%': 1,
@@ -297,6 +301,7 @@
     'configuration_policy%': '<(configuration_policy)',
     'safe_browsing%': '<(safe_browsing)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
+    'asan%': '<(asan)',
     'enable_register_protocol_handler%': '<(enable_register_protocol_handler)',
     'enable_smooth_scrolling%': '<(enable_smooth_scrolling)',
     'use_wayland%': '<(use_wayland)',
@@ -668,6 +673,10 @@
       ['enable_register_protocol_handler==1', {
         'grit_defines': ['-D', 'enable_register_protocol_handler'],
       }],
+
+      ['asan==1', {
+        'clang%': 1,
+      }],
     ],
   },
   'target_defaults': {
@@ -1511,6 +1520,11 @@
                 ],
               }]],
           }],
+          ['asan==1', {
+            'cflags': [

[Nico, 2011/08/10 18:48:17]

Is this required for ldflags as well? aarya was seeing issues building
genversion without this in ldflag

[glotov, 2011/08/12 20:13:05]

Yes, ldflags were added. ldl flag is passed by ASAN-patched Clang to linker when
it fases -fasan.

+              '-fasan',

[Nico, 2011/08/10 18:15:20]

Add a comment above this line "-fasan only works with clang, but asan=1 implies
clang=1"

[glotov, 2011/08/12 20:13:05]

Done.

+            ],
+          }],
           ['no_strict_aliasing==1', {
             'cflags': [
               '-fno-strict-aliasing',