jclulow · August 25, 2012 06:23
diff --git a/a.c b/a.c

 #include <stdlib.h>
 #include <stdio.h>
 #include "sigh.h"


 int
 main(void)
 {
 	whatever(10, 15);
 	(whatever)(10, 15);

 	printf("whatever @ %p\n", whatever);

 #undef	whatever
 	whatever(10, 15);

 	printf("whatever @ %p\n", whatever);

 	return (0);
 }
diff --git a/Makefile b/Makefile

 CC	= gcc

 xx:	sigh.o sigh.h a.c
 	$(CC) -o xx sigh.o a.c

 sigh.o:	sigh.c
 	$(CC) -c -o sigh.o sigh.c


diff --git a/sigh.c b/sigh.c

 #include <stdio.h>

 void
 whatever(int a, int b)
 {
 	printf("FUNCTION a %d b %d\n", a, b);
 }

diff --git a/sigh.h b/sigh.h
 #ifndef __SIGH_H__
 #define __SIGH_H__


 extern int whatever(int a, int b);

 #define	whatever(a, b)	\
 	do { \
 		printf("MACRO a %d b %d\n", (int)(a), (int)(b)); \
 	} while (0)


 #endif /* __SIGH_H__ */
diff --git a/zz_out.txt b/zz_out.txt
 $ ./xx
 MACRO a 10 b 15
 FUNCTION a 10 b 15
 whatever @ 0x104fd4dd0
 FUNCTION a 10 b 15
 whatever @ 0x104fd4dd0
	#ifndef __SIGH_H__
	#define __SIGH_H__


	extern int whatever(int a, int b);

	#define whatever(a, b) \
	do { \
	printf("MACRO a %d b %d\n", (int)(a), (int)(b)); \
	} while (0)


	#endif /* __SIGH_H__ */
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