3 files changed, 17 insertions, 17 deletions
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index c318b60a938..5cc19f5f8e6 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2049,3 +2049,7 @@ std::pair<unsigned, unsigned> Driver::getIncludeExcludeOptionFlagMasks() const {
 
   return std::make_pair(IncludedFlagsBitmask, ExcludedFlagsBitmask);
 }
+
+bool clang::driver::isOptimizationLevelFast(const llvm::opt::ArgList &Args) {
+  return Args.hasFlag(options::OPT_Ofast, options::OPT_O_Group, false);
+}
diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index 4103914d297..9f756f7c63d 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -341,16 +341,19 @@ void ToolChain::AddCCKextLibArgs(const ArgList &Args,
 
 bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
                                               ArgStringList &CmdArgs) const {
-  // Check if -ffast-math or -funsafe-math is enabled.
-  Arg *A = Args.getLastArg(options::OPT_ffast_math,
-                           options::OPT_fno_fast_math,
-                           options::OPT_funsafe_math_optimizations,
-                           options::OPT_fno_unsafe_math_optimizations);
-
-  if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
-      A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
-    return false;
-
+  // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
+  // (to keep the linker options consistent with gcc and clang itself).
+  if (!isOptimizationLevelFast(Args)) {
+    // Check if -ffast-math or -funsafe-math.
+    Arg *A =
+        Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
+                        options::OPT_funsafe_math_optimizations,
+                        options::OPT_fno_unsafe_math_optimizations);
+
+    if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
+        A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
+      return false;
+  }
   // If crtfastmath.o exists add it to the arguments.
   std::string Path = GetFilePath("crtfastmath.o");
   if (Path == "crtfastmath.o") // Not found.
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index ef3e00329dd..c90fb81f030 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2034,13 +2034,6 @@ static void SplitDebugInfo(const ToolChain &TC, Compilation &C,
   C.addCommand(new Command(JA, T, Exec, StripArgs));
 }
 
-static bool isOptimizationLevelFast(const ArgList &Args) {
-  if (Arg *A = Args.getLastArg(options::OPT_O_Group))
-    if (A->getOption().matches(options::OPT_Ofast))
-      return true;
-  return false;
-}
-
 /// \brief Vectorize at all optimization levels greater than 1 except for -Oz.
 static bool shouldEnableVectorizerAtOLevel(const ArgList &Args) {
   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {