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

build/standalone.gypi

Index: build/standalone.gypi
diff --git a/build/standalone.gypi b/build/standalone.gypi
index c0eaef419df30e2ff6538aed44e0940d87aa128d..34718d18de6a3cf950a4a754a6a882a112068ec1 100644
--- a/build/standalone.gypi
+++ b/build/standalone.gypi
@@ -7,6 +7,7 @@
 {
   'variables': {
     'component%': 'static_library',
+    'asan%': 0,
     'clang%': 0,
     'msvs_multi_core_compile%': '1',
     'variables': {
@@ -161,6 +162,17 @@
     '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',
@@ -250,6 +262,16 @@
         '-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': [