avoid bogus warnings about "unknown" pragmas with -frewrite-includes (pr#14831)
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186764 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/Frontend/InclusionRewriter.cpp b/lib/Rewrite/Frontend/InclusionRewriter.cpp
index 0c3269a..93ad9b8 100644
--- a/lib/Rewrite/Frontend/InclusionRewriter.cpp
+++ b/lib/Rewrite/Frontend/InclusionRewriter.cpp
@@ -16,6 +16,7 @@
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/PreprocessorOutputOptions.h"
#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Pragma.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"
@@ -503,6 +504,13 @@
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());
// First let the preprocessor process the entire file and call callbacks.
// Callbacks will record which #include's were actually performed.