Use ANSI string concatenation ... "does not give a valid preprocessing token"

[Yves Crespin]

I'm using __CONCAT() defined in /usr/include/sys/cdefs.h

#define __CONCAT(x,y) x ## y

With previous gcc version or other compiler I newer have a warning.
The preprocessor translate the following line
	static char default_path[] = BLOG_TMP_DIR;
to
	static char default_path[] = "/""tmp";

Do somebody know the correct compiler option to remove this warning?

	Thanks,

Yves
============= Cut Here =============
#include <stdio.h>

#define BLOG_SEP_DIR "/"
#define BLOG_TMP_DIR __CONCAT(BLOG_SEP_DIR,"tmp")

int main(int argc,char *argv[])
{
	static char default_path[] = BLOG_TMP_DIR;
	static char a[] = __CONCAT("/","tmp");

	printf("[%s]\n",default_path);
	printf("[%s]\n",a);
	return 0;
}
============= Cut Here =============
cc tcpp.c -o tcpp
tcpp.c:7:42: warning: pasting "BLOG_SEP_DIR" and ""tmp"" does not give a
valid preprocessing token
tcpp.c:8:31: warning: pasting ""/"" and ""tmp"" does not give a valid
preprocessing token

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