Add Multilib selection machinery

This patch improves the support for picking Multilibs from gcc installations.
It also provides a better approximation for the flags '-print-multi-directory'
and '-print-multi-lib'.

This reverts r201203 (i.e. re-applying r201202 with small fixes in
unittests/CMakeLists.txtto make the build bots happy).

review: http://llvm-reviews.chandlerc.com/D2538
llvm-svn: 201205

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 873969b4d78..4fe42b87cd2 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -209,6 +209,10 @@ namespace arm {
   const char* getLLVMArchSuffixForARM(StringRef CPU);
 }
 
+namespace mips {
+  bool hasMipsAbiArg(const llvm::opt::ArgList &Args, const char *Value);
+}
+
 namespace darwin {
   llvm::Triple::ArchType getArchTypeForMachOArchName(StringRef Str);
   void setTripleTypeForMachOArchName(llvm::Triple &T, StringRef Str);