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# strerror.m4 serial 9
dnl Copyright (C) 2002, 2007-2008 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_FUNC_STRERROR_SEPARATE])
if test $REPLACE_STRERROR = 1; then
AC_LIBOBJ([strerror])
AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
[Define this to 1 if strerror is broken.])
fi
])
# Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
[
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_REQUIRE([gl_HEADER_ERRNO_H])
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>
]],
[[return !*strerror (-2);]])],
[gl_cv_func_working_strerror=yes],
[gl_cv_func_working_strerror=no],
[dnl Assume crossbuild works if it compiles.
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
]],
[[return !*strerror (-2);]])],
[gl_cv_func_working_strerror=yes],
[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
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
if test $REPLACE_STRERROR = 1; then
gl_PREREQ_STRERROR
fi
])
# Prerequisites of lib/strerror.c.
AC_DEFUN([gl_PREREQ_STRERROR], [
AC_CHECK_DECLS([strerror])
AC_CHECK_HEADERS_ONCE([sys/socket.h])
if test $ac_cv_header_sys_socket_h != yes; then
dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
dnl the check for those headers unconditional; yet cygwin reports
dnl that the headers are present but cannot be compiled (since on
dnl cygwin, all socket information should come from sys/socket.h).
AC_CHECK_HEADERS([winsock2.h])
fi
])
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