3 Commits

Author	SHA1	Message	Date
Richard Smith	49faf9f4cd	[modules] Weaken an out-of-date assertion: an #undef can have no location if we ... imported it from a module when performing finalization before writing out an AST file. llvm-svn: 215272	2014-08-09 01:24:07 +00:00
Richard Smith	49f906a36f	If a module A exports a macro M, and a module B imports that macro and #undef's ... it, importers of B should not see the macro. This is complicated by the fact that A's macro could also be visible through a different path. The rules (as hashed out on cfe-commits) are included as a documentation update in this change. With this, the number of regressions in libc++'s testsuite when modules are enabled drops from 47 to 7. Those remaining 7 are also macro-related, and are due to remaining bugs in this change (in particular, the handling of submodules is imperfect). llvm-svn: 202560	2014-03-01 00:08:04 +00:00
Douglas Gregor	cfa46a82b8	Track which particular submodule #undef's a macro, so that the actual ... #undef only occurs if that submodule is imported. llvm-svn: 165773	2012-10-12 00:16:50 +00:00