Emulate MSVC's preprocessor macro argument separator behavior by not considering commas from nested macro expansions as argument separators. Fixes parsing of VS 2012 headers.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163022 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/microsoft-ext.c b/test/Preprocessor/microsoft-ext.c
new file mode 100644
index 0000000..a95ddca
--- /dev/null
+++ b/test/Preprocessor/microsoft-ext.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck %s
+
+# define M2(x, y) x + y
+# define P(x, y) {x, y}
+# define M(x, y) M2(x, P(x, y))
+M(a, b) // CHECK: a + {a, b}
+