do not warn about unknown pragmas in modes that do not handle them (pr9537)

And refactor to have just one place in code that sets up the empty
pragma handlers.

llvm-svn: 207758

1 files changed, 1 insertions, 7 deletions

diff --git a/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp b/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
index 70b299213f3..f333191d669 100644
--- a/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
+++ b/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
@@ -515,13 +515,7 @@ void clang::RewriteIncludesInInput(Preprocessor &PP, raw_ostream *OS,
   InclusionRewriter *Rewrite = new InclusionRewriter(PP, *OS,
                                                      Opts.ShowLineMarkers);
   PP.addPPCallbacks(Rewrite);
-  // Ignore all pragmas, otherwise there will be warnings about unknown pragmas
-  // (because there's nothing to handle them).
-  PP.AddPragmaHandler(new EmptyPragmaHandler());
-  // Ignore also all pragma in all namespaces created
-  // in Preprocessor::RegisterBuiltinPragmas().
-  PP.AddPragmaHandler("GCC", new EmptyPragmaHandler());
-  PP.AddPragmaHandler("clang", new EmptyPragmaHandler());
+  PP.IgnorePragmas();
 
   // First let the preprocessor process the entire file and call callbacks.
   // Callbacks will record which #include's were actually performed.