[Mips] Generate warning for invalid '-mnan' and '-march' combinations

This patch generates a warning for invalid combination of '-mnan' and
'-march' options, it properly sets NaN encoding for a given '-march',
and it passes a proper NaN encoding to the assembler.

Patch by Vladimir Radosavljevic.

Differential Revision: http://reviews.llvm.org/D8170

llvm-svn: 234882

1 files changed, 5 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index e8edaebbace..33fadd17004 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -234,6 +234,11 @@ namespace arm {
 }
 
 namespace mips {
+  typedef enum {
+    NanLegacy = 1,
+    Nan2008 = 2
+  } NanEncoding;
+  NanEncoding getSupportedNanEncoding(StringRef &CPU);
   void getMipsCPUAndABI(const llvm::opt::ArgList &Args,
                         const llvm::Triple &Triple, StringRef &CPUName,
                         StringRef &ABIName);