Frontend: Add a more explicit -backend-option flag for passing backend command

line options, instead of leveraging the blanket -mllvm option.
 - This allows using the frontend itself without requiring the backend have
   those options available (i.e., if the target wasn't built).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128087 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 6 insertions, 0 deletions

diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 418823482b..b29d73fd02 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -155,6 +155,8 @@ def momit_leaf_frame_pointer : Flag<"-momit-leaf-frame-pointer">,
   HelpText<"Omit frame pointer setup for leaf functions.">;
 def msoft_float : Flag<"-msoft-float">,
   HelpText<"Use software floating point">;
+def backend_option : Separate<"-backend-option">,
+  HelpText<"Additional arguments to forward to LLVM backend (during code gen)">;
 def mregparm : Separate<"-mregparm">,
   HelpText<"Limit the number of registers available for integer arguments">;
 def mrelax_all : Flag<"-mrelax-all">,
diff --git a/include/clang/Frontend/CodeGenOptions.h b/include/clang/Frontend/CodeGenOptions.h
index 875fbcd177..b49c431817 100644
--- a/include/clang/Frontend/CodeGenOptions.h
+++ b/include/clang/Frontend/CodeGenOptions.h
@@ -15,6 +15,7 @@
 #define LLVM_CLANG_FRONTEND_CODEGENOPTIONS_H
 
 #include <string>
+#include <vector>
 
 namespace clang {
 
@@ -114,6 +115,9 @@ public:
   /// The name of the relocation model to use.
   std::string RelocationModel;
 
+  /// A list of command-line options to forward to the LLVM backend.
+  std::vector<std::string> BackendOptions;
+
   /// The user specified number of registers to be used for integral arguments,
   /// or 0 if unspecified.
   unsigned NumRegisterParameters;