Bug 1180275 - Part 1: Add a release mozinfo variable; r=ted

build/docs/mozinfo.rst

@@ -122,6 +122,13 @@ processor
 
    Always defined.
 
+release
+   Whether this is a release build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
 tests_enabled
    Whether tests are enabled for this build.
 

python/mozbuild/mozbuild/mozinfo.py

@@ -80,6 +80,7 @@ def build_dict(config, env=os.environ):
     # other CPUs will wind up with unknown bits
 
     d['debug'] = substs.get('MOZ_DEBUG') == '1'
+    d['release'] = substs.get('RELEASE_BUILD') == '1'
     d['pgo'] = substs.get('MOZ_PGO') == '1'
     d['crashreporter'] = bool(substs.get('MOZ_CRASHREPORTER'))
     d['datareporting'] = bool(substs.get('MOZ_DATA_REPORTING'))