Re-apply r292662, "IRGen: Start using the WriteThinLTOBitcode pass."

The internal build issue has been resolved.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@293231 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index 6cc09a7522552f116fba234c316db545391b1ebf..1bf3c5aec79efb8b88e5face34d9aa1ab915b541 100644 (file)
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -684,9 +684,11 @@ void EmitAssemblyHelper::EmitAssembly(BackendAction Action,
     break;
 
   case Backend_EmitBC:
-    PerModulePasses.add(createBitcodeWriterPass(
-        *OS, CodeGenOpts.EmitLLVMUseLists, CodeGenOpts.EmitSummaryIndex,
-        CodeGenOpts.EmitSummaryIndex));
+    if (CodeGenOpts.EmitSummaryIndex)
+      PerModulePasses.add(createWriteThinLTOBitcodePass(*OS));
+    else
+      PerModulePasses.add(
+          createBitcodeWriterPass(*OS, CodeGenOpts.EmitLLVMUseLists));
     break;
 
   case Backend_EmitLL:

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0fd8f57f92a4921d0c7005378e58ee3d07ebabd7..23d23bcddcc1982aa38575c71fae7e2c3ee13db5 100644 (file)
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -88,6 +88,7 @@ if( NOT CLANG_BUILT_STANDALONE )
     llvm-bcanalyzer
     llvm-cat
     llvm-dis
+    llvm-modextract
     llvm-nm
     llvm-objdump
     llvm-profdata

diff --git a/test/CodeGenCXX/type-metadata-thinlto.cpp b/test/CodeGenCXX/type-metadata-thinlto.cpp
new file mode 100644 (file)
index 0000000..2a586fc
--- /dev/null
+++ b/test/CodeGenCXX/type-metadata-thinlto.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -flto=thin -flto-unit -triple x86_64-unknown-linux -fvisibility hidden -emit-llvm-bc -o %t %s
+// RUN: llvm-modextract -o - -n 1 %t | llvm-dis | FileCheck %s
+
+// CHECK: @_ZTV1A = linkonce_odr
+class A {
+  virtual void f() {}
+};
+
+A *f() {
+  return new A;
+}