# 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_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 #include ]], [[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 . Replace it. REPLACE_STRERROR=1 fi ])