1 # strerror.m4 serial 15
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],
24 if (!*strerror (-2)) result |= 1;
27 if (!*str) result |= 2;
28 if (errno) result |= 4;
29 if (strstr (str, "nknown") || strstr (str, "ndefined"))
32 [gl_cv_func_working_strerror=yes],
33 [gl_cv_func_working_strerror=no],
34 [dnl Be pessimistic on cross-compiles for now.
35 gl_cv_func_working_strerror=no])
37 if test $gl_cv_func_working_strerror = no; then
38 dnl The system's strerror() fails to return a string for out-of-range
39 dnl integers. Replace it.
42 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
43 dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
44 dnl buffer, we must replace strerror.
45 case "$gl_cv_func_strerror_r_works" in
46 *no) REPLACE_STRERROR=1 ;;
50 dnl The system's strerror() cannot know about the new errno values we add
51 dnl to <errno.h>. Replace it.