Add a -fno-elide-constructors option to clang-cc.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79782 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 3 insertions, 1 deletions

diff --git a/lib/CodeGen/CGCXX.cpp b/lib/CodeGen/CGCXX.cpp
index ebe61127b6..7a2c410fe8 100644
--- a/lib/CodeGen/CGCXX.cpp
+++ b/lib/CodeGen/CGCXX.cpp
@@ -512,7 +512,7 @@ CodeGenFunction::EmitCXXConstructExpr(llvm::Value *Dest,
 
   // Code gen optimization to eliminate copy constructor and return 
   // its first argument instead.
-  if (E->isElidable()) {
+  if (getContext().getLangOptions().ElideConstructors && E->isElidable()) {
     CXXConstructExpr::const_arg_iterator i = E->arg_begin();
     EmitAggExpr((*i), Dest, false);
     return;
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index b368124f4f..c025fcd1aa 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -107,6 +107,7 @@ PCHValidator::ReadLanguageOptions(const LangOptions &LangOpts) {
   PARSE_LANGOPT_BENIGN(getVisibilityMode());
   PARSE_LANGOPT_BENIGN(InstantiationDepth);
   PARSE_LANGOPT_IMPORTANT(OpenCL, diag::warn_pch_opencl);
+  PARSE_LANGOPT_IMPORTANT(ElideConstructors, diag::warn_elide_constructors);
 #undef PARSE_LANGOPT_IRRELEVANT
 #undef PARSE_LANGOPT_BENIGN
 
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index 48a1c9d5e3..5e1ea0b140 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -621,6 +621,7 @@ void PCHWriter::WriteLanguageOptions(const LangOptions &LangOpts) {
   Record.push_back(LangOpts.getVisibilityMode());
   Record.push_back(LangOpts.InstantiationDepth);
   Record.push_back(LangOpts.OpenCL);
+  Record.push_back(LangOpts.ElideConstructors);
   Stream.EmitRecord(pch::LANGUAGE_OPTIONS, Record);
 }