From b9e46e3ebc349f1d2b454a61ccedec4955dbb67f Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Fri, 29 Aug 2014 22:33:38 +0000
Subject: [PATCH] Add some missing test coverage for merging 'extern "C"'
 functions with modules.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216796 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Modules/Inputs/cxx-decls-imported.h  | 1 +
 test/Modules/Inputs/cxx-decls-merged.h    | 1 +
 test/Modules/Inputs/cxx-decls-premerged.h | 3 +++
 test/Modules/Inputs/module.map            | 4 ++++
 test/Modules/cxx-decls.cpp                | 6 ++++++
 5 files changed, 15 insertions(+)
 create mode 100644 test/Modules/Inputs/cxx-decls-premerged.h

diff --git a/test/Modules/Inputs/cxx-decls-imported.h b/test/Modules/Inputs/cxx-decls-imported.h
index ccf1cb2b35..7677511103 100644
--- a/test/Modules/Inputs/cxx-decls-imported.h
+++ b/test/Modules/Inputs/cxx-decls-imported.h
@@ -35,3 +35,4 @@ struct HasVirtualFunctions {
 struct OverridesVirtualFunctions : HasVirtualFunctions {
   void f();
 };
+extern "C" void ExternCFunction();
diff --git a/test/Modules/Inputs/cxx-decls-merged.h b/test/Modules/Inputs/cxx-decls-merged.h
index 3f9da1a55e..8ba2df63ca 100644
--- a/test/Modules/Inputs/cxx-decls-merged.h
+++ b/test/Modules/Inputs/cxx-decls-merged.h
@@ -13,3 +13,4 @@ struct OverridesVirtualFunctions : HasVirtualFunctions {
   void f();
 };
 extern OverridesVirtualFunctions overrides_virtual_functions;
+extern "C" void ExternCFunction();
diff --git a/test/Modules/Inputs/cxx-decls-premerged.h b/test/Modules/Inputs/cxx-decls-premerged.h
new file mode 100644
index 0000000000..064fb9ea67
--- /dev/null
+++ b/test/Modules/Inputs/cxx-decls-premerged.h
@@ -0,0 +1,3 @@
+extern "C" void ExternCFunction();
+
+#include "cxx-decls-imported.h"
diff --git a/test/Modules/Inputs/module.map b/test/Modules/Inputs/module.map
index 72a65cf871..e8011c7055 100644
--- a/test/Modules/Inputs/module.map
+++ b/test/Modules/Inputs/module.map
@@ -246,6 +246,10 @@ module cxx_decls {
   }
 }
 
+module cxx_decls_premerged {
+  header "cxx-decls-premerged.h"
+}
+
 module cxx_decls_merged {
   header "cxx-decls-merged.h"
 }
diff --git a/test/Modules/cxx-decls.cpp b/test/Modules/cxx-decls.cpp
index ee196cfc33..77982e46fb 100644
--- a/test/Modules/cxx-decls.cpp
+++ b/test/Modules/cxx-decls.cpp
@@ -41,5 +41,11 @@ int name_for_linkage_test = use_name_for_linkage(name_for_linkage);
 int overrides_virtual_functions_test =
     use_overrides_virtual_functions(overrides_virtual_functions);
 
+void use_extern_c_function() { ExternCFunction(); }
+
+@import cxx_decls_premerged;
+
+void use_extern_c_function_2() { ExternCFunction(); }
+
 // CHECK: VarDecl [[mergeUsedFlag:0x[0-9a-f]*]] {{.*}} in cxx_decls.imported used mergeUsedFlag
 // CHECK: VarDecl {{0x[0-9a-f]*}} prev [[mergeUsedFlag]] {{.*}} in cxx_decls_merged used mergeUsedFlag
-- 
2.40.0