switch Warnings.cpp to use the diagnostics machinery to print diagnostics, not *fprintf*!

Among other things, this makes the warning about unknown warning options mappable.
For example:

$ clang t.c -Werror -Wfoo
error: unknown warning option '-Wfoo' [-Wunknown-warning-option]

For another thing, they are properly color coded now too :)

llvm-svn: 73936

1 files changed, 3 insertions, 1 deletions

diff --git a/clang/lib/Frontend/Warnings.cpp b/clang/lib/Frontend/Warnings.cpp
index 81f75bdf755..c8fd5f6fcbc 100644
--- a/clang/lib/Frontend/Warnings.cpp
+++ b/clang/lib/Frontend/Warnings.cpp
@@ -24,6 +24,7 @@
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Sema/SemaDiagnostic.h"
 #include "clang/Lex/LexDiagnostic.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
 #include <cstdio>
 #include <cstring>
 #include <utility>
@@ -99,7 +100,8 @@ bool clang::ProcessWarningOptions(Diagnostic &Diags,
     }
     
     if (Diags.setDiagnosticGroupMapping(OptStart, Mapping))
-      fprintf(stderr, "warning: unknown warning option: -W%s\n", Opt.c_str());
+      Diags.Report(FullSourceLoc(), diag::warn_unknown_warning_option)
+        << ("-W" + Opt);
   }
   
   return false;