gcc/testsuite/gcc.dg/cpp/cmdlne-dU-21.c - gcc - Git at Google

 /* { dg-do preprocess } */
 /* { dg-options "-P -dU" } */
 /* { dg-final { scan-file cmdlne-dU-21.i "^\n*hello There\n+#define ASTRING There\n+#define MACROARGS\\(A\\) A\n+#undef BSTRING\n*$" } } */
 #define ASTRING There
 #define MACROARGS(A) A
 MACROARGS(hello) ASTRING
 #ifdef BSTRING
 bye
 #endif
	/* { dg-do preprocess } */
	/* { dg-options "-P -dU" } */
	/* { dg-final { scan-file cmdlne-dU-21.i "^\nhello There\n+#define ASTRING There\n+#define MACROARGS\\(A\\) A\n+#undef BSTRING\n$" } } */
	#define ASTRING There
	#define MACROARGS(A) A
	MACROARGS(hello) ASTRING
	#ifdef BSTRING
	bye
	#endif