r195495 - Debug Info: add a "Debug Info Version" module flag to output the current debug

[Manman Ren]

Author: mren
Date: Fri Nov 22 13:42:45 2013
New Revision: 195495

URL: http://llvm.org/viewvc/llvm-project?rev=195495&view=rev
Log:
Debug Info: add a "Debug Info Version" module flag to output the current debug
info version number.

Will error out when modules have different version numbers.

Added:
    cfe/trunk/test/CodeGen/debug-info-version.c
Modified:
    cfe/trunk/lib/CodeGen/CodeGenModule.cpp

Modified: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.cpp?rev=195495&r1=195494&r2=195495&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.cpp (original)
+++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp Fri Nov 22 13:42:45 2013
@@ -258,6 +258,11 @@ void CodeGenModule::Release() {
     // We can change from Warning to Latest if such mode is supported.
     getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
                               CodeGenOpts.DwarfVersion);
+  if (DebugInfo)
+    // We support a single version in the linked module: error out when
+    // modules do not have the same version.
+    getModule().addModuleFlag(llvm::Module::Error, "Debug Info Version",
+                              llvm::dwarf::DEBUG_INFO_VERSION);
 
   SimplifyPersonality();
 

Added: cfe/trunk/test/CodeGen/debug-info-version.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/debug-info-version.c?rev=195495&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/debug-info-version.c (added)
+++ cfe/trunk/test/CodeGen/debug-info-version.c Fri Nov 22 13:42:45 2013
@@ -0,0 +1,8 @@
+// RUN: %clang -g -S -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang -S -emit-llvm -o - %s | FileCheck %s --check-prefix=NO_DEBUG
+int main (void) {
+  return 0;
+}
+
+// CHECK: metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+// NO_DEBUG-NOT: metadata !"Debug Info Version"