-# strerror.m4 serial 1 (gettext-0.12)
-dnl Copyright (C) 2002 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License. As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# strerror.m4 serial 15
+dnl Copyright (C) 2002, 2007-2011 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_STRERROR],
[
- AC_REPLACE_FUNCS(strerror)
- if test $ac_cv_func_strerror = no; then
- gl_PREREQ_STRERROR
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+ AC_REQUIRE([gl_HEADER_ERRNO_H])
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
+ ])
+ if test -z "$ERRNO_H"; then
+ AC_CACHE_CHECK([for working strerror function],
+ [gl_cv_func_working_strerror],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ #include <errno.h>
+ ]],
+ [[int result = 0;
+ char *str;
+ if (!*strerror (-2)) result |= 1;
+ errno = 0;
+ str = strerror (0);
+ if (!*str) result |= 2;
+ if (errno) result |= 4;
+ if (strstr (str, "nknown") || strstr (str, "ndefined"))
+ result |= 8;
+ return result;]])],
+ [gl_cv_func_working_strerror=yes],
+ [gl_cv_func_working_strerror=no],
+ [dnl Be pessimistic on cross-compiles for now.
+ gl_cv_func_working_strerror=no])
+ ])
+ if test $gl_cv_func_working_strerror = no; then
+ dnl The system's strerror() fails to return a string for out-of-range
+ dnl integers. Replace it.
+ REPLACE_STRERROR=1
+ fi
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
+ dnl buffer, we must replace strerror.
+ case "$gl_cv_func_strerror_r_works" in
+ *no) REPLACE_STRERROR=1 ;;
+ esac
+ ])
+ else
+ dnl The system's strerror() cannot know about the new errno values we add
+ dnl to <errno.h>. Replace it.
+ REPLACE_STRERROR=1
fi
])
-
-# Prerequisites of lib/strerror.c.
-AC_DEFUN([gl_PREREQ_STRERROR], [
- :
-])