[PATCH] D95392: Restore GNU , ## __VA_ARGS__ behavior in MSVC mode too

[Harald van Dijk via Phabricator via cfe-commits]

hvdijk created this revision.
hvdijk added a reviewer: rsmith.
hvdijk added a project: LLVM.
hvdijk requested review of this revision.
Herald added a project: clang.
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As noted in D91913 <https://reviews.llvm.org/D91913>, MSVC implements the GNU behavior for , ## __VA_ARGS__ as well. Do the same when `-fms-compatibility` is used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95392

Files:
  clang/lib/Lex/TokenLexer.cpp
  clang/test/Preprocessor/macro_fn_comma_swallow2.c


Index: clang/test/Preprocessor/macro_fn_comma_swallow2.c
===================================================================
--- clang/test/Preprocessor/macro_fn_comma_swallow2.c
+++ clang/test/Preprocessor/macro_fn_comma_swallow2.c
@@ -9,6 +9,8 @@
 // RUN: %clang_cc1 -E -x c++ -std=c++11 %s | FileCheck -check-prefix=C99 -strict-whitespace %s
 // RUN: %clang_cc1 -E -std=gnu99 %s | FileCheck -check-prefix=GCC -strict-whitespace %s
 // RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s
+// RUN: %clang_cc1 -E -x c++ -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s
+// RUN: %clang_cc1 -E -x c++ -std=c++11 -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s
 // RUN: %clang_cc1 -E -DNAMED %s | FileCheck -check-prefix=GCC -strict-whitespace %s
 // RUN: %clang_cc1 -E -std=c99 -DNAMED %s | FileCheck -check-prefix=C99 -strict-whitespace %s
 
Index: clang/lib/Lex/TokenLexer.cpp
===================================================================
--- clang/lib/Lex/TokenLexer.cpp
+++ clang/lib/Lex/TokenLexer.cpp
@@ -152,7 +152,8 @@
   // named arguments, where it remains.  With GNU extensions, it is removed
   // regardless of named arguments.
   // Microsoft also appears to support this extension, unofficially.
-  if (!PP.getLangOpts().GNUMode && Macro->getNumParams() < 2)
+  if (!PP.getLangOpts().GNUMode && !PP.getLangOpts().MSVCCompat &&
+      Macro->getNumParams() < 2)
     return false;
 
   // Is a comma available to be removed?


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