Add an implementation of -dM that follows GCC closely enough to permit

diffing the output of:
  clang -dM -o - -E -x c foo.c | sort

llvm-svn: 63926

1 files changed, 31 insertions, 0 deletions

diff --git a/clang/test/Preprocessor/dump_macros.c b/clang/test/Preprocessor/dump_macros.c
new file mode 100644
index 00000000000..348257fb519
--- /dev/null
+++ b/clang/test/Preprocessor/dump_macros.c
@@ -0,0 +1,31 @@
+// RUN: clang -E -dM %s -o %t &&
+
+// Space even without expansion tokens
+// RUN: grep "#define A(x) " %t &&
+#define A(x)
+
+// Space before expansion list.
+// RUN: grep "#define B(x,y) x y" %t &&
+#define B(x,y)x y
+
+// No space in expansion list.
+// RUN: grep "#define C(x,y) x y" %t &&
+#define C(x, y) x y
+
+// No paste avoidance.
+// RUN: grep "#define X() .." %t &&
+#define X() ..
+
+// Simple test.
+// RUN: grep "#define Y ." %t &&
+// RUN: grep "#define Z X()Y" %t &&
+#define Y .
+#define Z X()Y
+
+// gcc prints macros at end of translation unit, so last one wins.
+// RUN: grep "#define foo 2" %t &&
+// RUN: not grep "#define foo 1" %t
+#define foo 1
+#undef foo
+#define foo 2
+