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..031e9339f79d35bce483400468435cd755739a53 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -402,6 +402,10 @@
     'clang_load%': '',
     'clang_add_plugin%': '',
 
+    # Enable building with ASAN.
+    # See https://sites.google.com/a/chromium.org/dev/developers/testing/addresssanitizer
+    'asan%': 0,

[Nico, 2011/08/05 18:37:19]

Should setting this set 'clang' to 1 automatically?

[glotov, 2011/08/10 18:10:30]

Done.

+
     # Enable sampling based profiler.
     # See http://google-perftools.googlecode.com/svn/trunk/doc/cpuprofile.html
     'profiling%': '0',
@@ -1511,6 +1515,14 @@
                 ],
               }]],
           }],
+          ['clang==1 and asan==1', {
+            'target_conditions': [

[Nico, 2011/08/05 18:37:19]

I think the 'target_conditions'/ '_toolset' part should no longer be necessary
when people build with CC.host set as now described on
http://code.google.com/p/chromium/wiki/Clang

[glotov, 2011/08/10 18:10:30]

Done.

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