When we load the first module, make sure that we wire up the ASTConsumer to the newly-created ASTReader. This makes sure that CodeGen sees the declarations it is interested in

llvm-svn: 139824

clang/lib/Frontend/CompilerInstance.cpp

@@ -756,6 +756,8 @@ ModuleKey CompilerInstance::loadModule(SourceLocation ImportLoc,
     getASTContext().setExternalSource(Source);
     if (hasSema())
       ModuleManager->InitializeSema(getSema());
+    if (hasASTConsumer())
+      ModuleManager->StartTranslationUnit(&getASTConsumer());
   }
   
   // Try to load the module we found.

clang/lib/Serialization/ASTReader.cpp

@@ -4092,6 +4092,7 @@ void ASTReader::StartTranslationUnit(ASTConsumer *Consumer) {
     // passing to the consumer.
     GetDecl(ExternalDefinitions[I]);
   }
+  ExternalDefinitions.clear();
 
   PassInterestingDeclsToConsumer();
 }

clang/test/Modules/irgen.c

@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -emit-module -triple x86_64-apple-darwin10 -o %t/module.pcm -DBUILD_MODULE %s
+// RUN: %clang_cc1 -fmodule-cache-path %t -triple x86_64-apple-darwin10 -fdisable-module-hash -emit-llvm -o - %s | FileCheck %s
+
+#ifdef BUILD_MODULE
+static inline int triple(int x) { return x * 3; }
+#else
+__import_module__ module;
+
+// CHECK: define void @triple_value
+void triple_value(int *px) {
+  *px = triple(*px);
+}
+
+// CHECK: define internal i32 @triple(i32
+#endif