Mercurial > gnulib
view m4/memcmp.m4 @ 40198:5a34193cbc07
long-options: add parse_gnu_standard_options_only
Discussed in https://bugs.gnu.org/33468 .
* lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead
of 0.
(parse_gnu_standard_options_only): Add function to
process the GNU default options --help and --version and fail for any other
unknown long or short option. See
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html .
* lib/long-options.h (parse_gnu_standard_options_only): Declare it.
* modules/long-options (depends-on): Add stdbool, exitfail.
* top/maint.mk (sc_prohibit_long_options_without_use): Update
syntax-check rule, add new function name.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
# memcmp.m4 serial 16 dnl Copyright (C) 2002-2004, 2007-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_MEMCMP], [ dnl We don't use AC_FUNC_MEMCMP any more, because it is no longer maintained dnl in Autoconf and because it invokes AC_LIBOBJ. AC_CACHE_CHECK([for working memcmp], [gl_cv_func_memcmp_working], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [AC_INCLUDES_DEFAULT], [[/* Some versions of memcmp are not 8-bit clean. */ char c0 = '\100', c1 = '\200', c2 = '\201'; if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0) return 1; /* The Next x86 OpenStep bug shows up only when comparing 16 bytes or more and with at least one buffer not starting on a 4-byte boundary. William Lewis provided this test program. */ { char foo[21]; char bar[21]; int i; for (i = 0; i < 4; i++) { char *a = foo + i; char *b = bar + i; strcpy (a, "--------01111111"); strcpy (b, "--------10000000"); if (memcmp (a, b, 16) >= 0) return 1; } return 0; } ]])], [gl_cv_func_memcmp_working=yes], [gl_cv_func_memcmp_working=no], [dnl When cross-compiling, guess memcmp works when it exists. dnl This is useful for mingw. AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <string.h>]], [[int ret = memcmp ("foo", "bar", 0);]])], [gl_cv_func_memcmp_working="guessing yes"], [gl_cv_func_memcmp_working="guessing no"]) ]) ]) case "$gl_cv_func_memcmp_working" in *yes) gl_func_memcmp=yes ;; *) gl_func_memcmp=no ;; esac if test $gl_func_memcmp = no; then AC_DEFINE([memcmp], [rpl_memcmp], [Define to rpl_memcmp if the replacement function should be used.]) fi ]) # Prerequisites of lib/memcmp.c. AC_DEFUN([gl_PREREQ_MEMCMP], [:])