support operator keywords used in Windows SDK

to support operator keywords used in Windows SDK, alter token type when 
seen in system headers

Hello, I submitted D33505 to address this problem, but the 
proposal was rejected as too big a hammer.
This change will allow clang to parse the WindowsSDK header <query.h> 
which uses the operator name "or" as a field name. Treat cpp operator 
keywords as ordinary identifiers inside the Microsoft headers, but 
treat them as usual in the user's program.

Original Submitter: Melanie Blower (mibintc)

Differential Revision: https://reviews.llvm.org/D33782

llvm-svn: 305087

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/test/Headers/ms-cppoperkey2.cpp b/clang/test/Headers/ms-cppoperkey2.cpp
new file mode 100644
index 00000000000..2afed36b744
--- /dev/null
+++ b/clang/test/Headers/ms-cppoperkey2.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1  -triple x86_64-pc-win32 -fms-compatibility \
+// RUN:     -ffreestanding -fsyntax-only -Werror  %s -verify
+// RUN: %clang_cc1 \
+// RUN:     -ffreestanding -fsyntax-only -Werror  %s -verify
+// expected-no-diagnostics
+int bb ( int x)
+{
+  // In user code, treat operator keyword as operator keyword.
+  if ( x>1 or x<0) return 1;
+  else return 0;  
+}