/* Declarations for getopt.
- Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
+ Copyright (C) 1989-2020 Free Software Foundation, Inc.
NOTE: The canonical source of this file is maintained with the GNU C Library.
Bugs can be reported to bug-glibc@gnu.org.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
USA. */
#ifndef _GETOPT_H
#define optional_argument 2
#if defined (__STDC__) && __STDC__
-#ifdef __GNU_LIBRARY__
+/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1. If it is
+ undefined, we haven't run the autoconf check so provide the
+ declaration without arguments. If it is 0, we checked and failed
+ to find the declaration so provide a fully prototyped one. If it
+ is 1, we found it so don't provide any declaration at all. */
+#if !HAVE_DECL_GETOPT
+#if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
/* Many other libraries have conflicting prototypes for getopt, with
- differences in the consts, in stdlib.h. To avoid compilation
+ differences in the consts, in unistd.h. To avoid compilation
errors, only prototype getopt for the GNU C library. */
extern int getopt (int argc, char *const *argv, const char *shortopts);
-#else /* not __GNU_LIBRARY__ */
+#else
+#ifndef __cplusplus
extern int getopt ();
-#endif /* __GNU_LIBRARY__ */
+#endif /* __cplusplus */
+#endif
+#endif /* !HAVE_DECL_GETOPT */
+
extern int getopt_long (int argc, char *const *argv, const char *shortopts,
const struct option *longopts, int *longind);
extern int getopt_long_only (int argc, char *const *argv,