Bug 844654 - Part 1: Support MODULE in moz.build; r=gps

python/mozbuild/mozbuild/frontend/emitter.py

@@ -74,6 +74,8 @@ class TreeMetadataEmitter(object):
         # them. We should aim to keep this set small because it violates the
         # desired abstraction of the build definition away from makefiles.
         passthru = VariablePassthru(sandbox)
+        if sandbox['MODULE']:
+            passthru.variables['MODULE'] = sandbox['MODULE']
         if sandbox['XPIDL_SOURCES']:
             passthru.variables['XPIDLSRCS'] = sandbox['XPIDL_SOURCES']
         if sandbox['XPIDL_MODULE']:

python/mozbuild/mozbuild/frontend/sandbox_symbols.py

@@ -141,6 +141,16 @@ VARIABLES = {
         variables declared during configure.
         """),
 
+    'MODULE': (unicode, "",
+        """Module name.
+
+        Historically, this variable was used to describe where to install header
+        files, but that feature is now handled by EXPORTS_NAMESPACES. Currently
+        it is used as the XPIDL module name if XPIDL_MODULE is not defined, but
+        using XPIDL_MODULE directly is preferred. MODULE will likely be removed
+        in the future.
+        """),
+
     # IDL Generation.
     'XPIDL_SOURCES': (list, [],
         """XPCOM Interface Definition Files (xpidl).