[modules] When checking the include guard for a header, check whether it's

visible in the module we're considering entering. Previously we assumed that if
we knew the include guard for a modular header, we'd already parsed it, but
that need not be the case if a header is present in the current module and one
of its dependencies; the result of getting this wrong was that the current
module's submodule for the header would end up empty.

llvm-svn: 241953

1 files changed, 5 insertions, 0 deletions

diff --git a/clang/test/Modules/multiple-include.cpp b/clang/test/Modules/multiple-include.cpp
new file mode 100644
index 00000000000..7cbeefc8178
--- /dev/null
+++ b/clang/test/Modules/multiple-include.cpp
@@ -0,0 +1,5 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -I%S/Inputs/multiple-include -fmodules-cache-path=%t -fimplicit-module-maps -verify %s -fmodules-local-submodule-visibility
+// expected-no-diagnostics
+#include "b.h"
+int c = get();