compat/fnmatch/fnmatch.c: give a fall-back definition for NULL

Somebody tried to compile fnmatch.c compatibility file on Interix and got
an error because no header included in the file on that platform defined
NULL.  It usually comes from stddef.h and indirectly from other headers
like string.h, unistd.h, stdio.h, stdlib.h, etc., but with the way we
compile this file from our Makefile, inclusion of the header files that
are expected to define NULL in fnmatch.c do not happen because they are
protected with "#ifdef STDC_HEADERS", etc. which we do not pass.

As the least-impact workaround, give a fall-back definition when none of
the headers define NULL.

Noticed-by: Markus Duft <mduft@gentoo.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/fnmatch/fnmatch.c b/compat/fnmatch/fnmatch.c
index 14feac7fe179069908df6dbc084b2adcc78c9242..9473aed2bbcb91994f166cf66d24459c66ac2fcb 100644 (file)
--- a/compat/fnmatch/fnmatch.c
+++ b/compat/fnmatch/fnmatch.c
@@ -127,6 +127,10 @@ extern char *getenv ();
 extern int errno;
 # endif
 
+# ifndef NULL
+#  define NULL 0
+# endif
+
 /* This function doesn't exist on most systems.  */
 
 # if !defined HAVE___STRCHRNUL && !defined _LIBC