strerror_r.m4
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#serial 1004
# This file is not needed if you can assume Autoconf 2.54 or later.
# Experimental replacement for the function in the latest CVS autoconf.
# Use with the error.c file in ../lib.
# Copyright (C) 2001 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
undefine([AC_FUNC_STRERROR_R])
# AC_FUNC_STRERROR_R
# ------------------
AC_DEFUN([AC_FUNC_STRERROR_R],
[AC_CHECK_DECLS([strerror_r])
AC_CHECK_FUNCS([strerror_r])
AC_CACHE_CHECK([whether strerror_r returns char *],
ac_cv_func_strerror_r_char_p,
[
ac_cv_func_strerror_r_char_p=no
if test $ac_cv_have_decl_strerror_r = yes; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[
char buf[100];
char x = *strerror_r (0, buf, sizeof buf);
char *p = strerror_r (0, buf, sizeof buf);
return !p || x;
]])],
ac_cv_func_strerror_r_char_p=yes)
else
# strerror_r is not declared. Choose between
# systems that have relatively inaccessible declarations for the
# function. BeOS and DEC UNIX 4.0 fall in this category, but the
# former has a strerror_r that returns char*, while the latter
# has a strerror_r that returns `int'.
# This test should segfault on the DEC system.
AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
extern char *strerror_r ();],
[[char buf[100];
char x = *strerror_r (0, buf, sizeof buf);
exit (!isalpha (x));]])],
ac_cv_func_strerror_r_char_p=yes, , :)
fi
])
if test $ac_cv_func_strerror_r_char_p = yes; then
AC_DEFINE([STRERROR_R_CHAR_P], 1,
[Define to 1 if strerror_r returns char *.])
fi
])# AC_FUNC_STRERROR_R