1 # strerror.m4 serial 13
2 dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_STRERROR],
9 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
10 AC_REQUIRE([gl_HEADER_ERRNO_H])
11 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
12 AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
14 if test -z "$ERRNO_H"; then
15 AC_CACHE_CHECK([for working strerror function],
16 [gl_cv_func_working_strerror],
23 if (!*strerror (-2)) result |= 1;
25 if (!*strerror (0)) result |= 2;
26 if (errno) result |= 4;
28 [gl_cv_func_working_strerror=yes],
29 [gl_cv_func_working_strerror=no],
30 [dnl Be pessimistic on cross-compiles for now.
31 gl_cv_func_working_strerror=no])
33 if test $gl_cv_func_working_strerror = no; then
34 dnl The system's strerror() fails to return a string for out-of-range
35 dnl integers. Replace it.
38 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
39 dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
40 dnl buffer, we must replace strerror.
41 case "$gl_cv_func_strerror_r_works" in
42 *no) REPLACE_STRERROR=1 ;;
46 dnl The system's strerror() cannot know about the new errno values we add
47 dnl to <errno.h>. Replace it.
52 # Prerequisites of lib/strerror.c.
53 AC_DEFUN([gl_PREREQ_STRERROR], [
54 AC_CHECK_DECLS([strerror])
55 AC_CHECK_HEADERS_ONCE([sys/socket.h])
56 if test $ac_cv_header_sys_socket_h != yes; then
57 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
58 dnl the check for those headers unconditional; yet cygwin reports
59 dnl that the headers are present but cannot be compiled (since on
60 dnl cygwin, all socket information should come from sys/socket.h).
61 AC_CHECK_HEADERS([winsock2.h])