[CodeGen] If there is a function definition with duplicate mangled name, emit an...

rdar://15522601 & http://llvm.org/PR18031

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195556 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 23ab1433198ed8a5143f48233bd8035508f10cdb..8f2903aaef4b6e323a67e238c83f08bcf3c40f4e 100644 (file)
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -2028,6 +2028,8 @@ def err_alias_not_supported_on_darwin : Error <
   "only weak aliases are supported on darwin">;
 def err_alias_to_undefined : Error<
   "alias must point to a defined variable or function">;
+def err_duplicate_mangled_name : Error<
+  "definition with same mangled name as another definition">;
 def err_cyclic_alias : Error<
   "alias definition is part of a cycle">;
 def warn_attribute_wrong_decl_type : Warning<

diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 8240f8d38c151572543b6093d3b8e51610251ec6..2acb2ec1e8f01b66f546bc533ab6144082fe0334 100644 (file)
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -2100,6 +2100,10 @@ void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
     Entry = CE->getOperand(0);
   }
 
+  if (!cast<llvm::GlobalValue>(Entry)->isDeclaration()) {
+    getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name);
+    return;
+  }
 
   if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
     llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);