Add first pieces of support for parsing and representing

extern "C" in C++ mode.  Patch by Mike Stump!

llvm-svn: 45904

3 files changed, 25 insertions, 0 deletions

diff --git a/clang/CodeGen/CodeGenModule.cpp b/clang/CodeGen/CodeGenModule.cpp
index 9a65d2e2967..bb61dc7cd82 100644
--- a/clang/CodeGen/CodeGenModule.cpp
+++ b/clang/CodeGen/CodeGenModule.cpp
@@ -44,6 +44,16 @@ void CodeGenModule::WarnUnsupported(const Stmt *S, const char *Type) {
                     &Msg, 1, &Range, 1);
 }
 
+/// WarnUnsupported - Print out a warning that codegen doesn't support the
+/// specified decl yet.
+void CodeGenModule::WarnUnsupported(const Decl *D, const char *Type) {
+  unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Warning, 
+                                               "cannot codegen this %0 yet");
+  std::string Msg = Type;
+  getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID,
+                    &Msg, 1);
+}
+
 /// ReplaceMapValuesWith - This is a really slow and bad function that
 /// searches for any entries in GlobalDeclMap that point to OldVal, changing
 /// them to point to NewVal.  This is badbadbad, FIXME!
diff --git a/clang/CodeGen/CodeGenModule.h b/clang/CodeGen/CodeGenModule.h
index 6653e508813..b86ceba426b 100644
--- a/clang/CodeGen/CodeGenModule.h
+++ b/clang/CodeGen/CodeGenModule.h
@@ -95,6 +95,10 @@ public:
   /// specified stmt yet.
   void WarnUnsupported(const Stmt *S, const char *Type);
   
+  /// WarnUnsupported - Print out a warning that codegen doesn't support the
+  /// specified decl yet.
+  void WarnUnsupported(const Decl *D, const char *Type);
+  
 private:
   /// ReplaceMapValuesWith - This is a really slow and bad function that
   /// searches for any entries in GlobalDeclMap that point to OldVal, changing
diff --git a/clang/CodeGen/ModuleBuilder.cpp b/clang/CodeGen/ModuleBuilder.cpp
index 49881c36d94..fff5b3fbfff 100644
--- a/clang/CodeGen/ModuleBuilder.cpp
+++ b/clang/CodeGen/ModuleBuilder.cpp
@@ -13,6 +13,7 @@
 
 #include "clang/CodeGen/ModuleBuilder.h"
 #include "CodeGenModule.h"
+#include "clang/AST/Decl.h"
 using namespace clang;
 
 
@@ -34,6 +35,16 @@ void clang::CodeGen::CodeGenFunction(CodeGenModule *B, FunctionDecl *D) {
   B->EmitFunction(D);
 }
 
+/// CodeGenLinkageSpec - Emit the specified linkage space to LLVM.
+void clang::CodeGen::CodeGenLinkageSpec(CodeGenModule *Builder,
+					LinkageSpecDecl *LS) {
+  if (LS->getLanguage() == LinkageSpecDecl::lang_cxx)
+    Builder->WarnUnsupported(LS, "linkage spec");
+
+  // FIXME: implement C++ linkage, C linkage works mostly by C
+  // language reuse already.
+}
+
 /// CodeGenGlobalVar - Emit the specified global variable to LLVM.
 void clang::CodeGen::CodeGenGlobalVar(CodeGenModule *Builder, FileVarDecl *D) {
   Builder->EmitGlobalVarDeclarator(D);