[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, 2 insertions, 0 deletions

diff --git a/clang/test/Modules/Inputs/multiple-include/module.modulemap b/clang/test/Modules/Inputs/multiple-include/module.modulemap
new file mode 100644
index 00000000000..1228ae6cbb7
--- /dev/null
+++ b/clang/test/Modules/Inputs/multiple-include/module.modulemap
@@ -0,0 +1,2 @@
+module A { module a { header "a.h" } module b { header "b.h" } module c { header "c.h" } }
+module X { module x { header "x.h" } module c { header "c.h" } }