Add another terrible VC++ compatibility hack: allow users to

allow invalid token pastes (when in -fms-extensions mode)
with -Wno-invalid-token-paste

llvm-svn: 108624

1 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/Lex/TokenLexer.cpp b/clang/lib/Lex/TokenLexer.cpp
index 56bb073e591..55609492a7f 100644
--- a/clang/lib/Lex/TokenLexer.cpp
+++ b/clang/lib/Lex/TokenLexer.cpp
@@ -478,7 +478,7 @@ bool TokenLexer::PasteTokens(Token &Tok) {
           return true;
         }
 
-        // Do not emit the warning when preprocessing assembler code.
+        // Do not emit the error when preprocessing assembler code.
         if (!PP.getLangOptions().AsmPreprocessor) {
           // Explicitly convert the token location to have proper instantiation
           // information so that the user knows where it came from.
@@ -486,7 +486,12 @@ bool TokenLexer::PasteTokens(Token &Tok) {
           SourceLocation Loc =
             SM.createInstantiationLoc(PasteOpLoc, InstantiateLocStart,
                                       InstantiateLocEnd, 2);
-          PP.Diag(Loc, diag::err_pp_bad_paste)
+          // If we're in microsoft extensions mode, downgrade this from a hard
+          // error to a warning that defaults to an error.  This allows
+          // disabling it.
+          PP.Diag(Loc,
+                  PP.getLangOptions().Microsoft ? diag::err_pp_bad_paste_ms 
+                                                : diag::err_pp_bad_paste)
             << std::string(Buffer.begin(), Buffer.end());
         }