-#serial 1
+#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.
-dnl From Jim Meyering.
-dnl Determine whether the strerror_r implementation is one of
-dnl the broken ones that returns `int' rather than `char*'.
-dnl Actually, this tests only whether it returns a scalar
-dnl or an array, but that should be enough.
-dnl On at least DEC UNIX 4.0[A-D], strerror_r returns `int'.
-dnl This is used by lib/error.c.
+# 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.
-AC_DEFUN(jm_FUNC_STRERROR_R,
-[
- # Check strerror_r
- AC_CHECK_FUNCS([strerror_r])
- if test $ac_cv_func_strerror_r = yes; then
- AC_CHECK_HEADERS(string.h)
- AC_CACHE_CHECK([for working strerror_r],
- jm_cv_func_working_strerror_r,
- [
- AC_TRY_COMPILE(
- [
-# include <stdio.h>
-# if HAVE_STRING_H
-# include <string.h>
-# endif
- ],
- [
- int buf; /* avoiding square brackets makes this easier */
- char x = *strerror_r (0, buf, sizeof buf);
- ],
- jm_cv_func_working_strerror_r=yes,
- jm_cv_func_working_strerror_r=no
- )
- if test $jm_cv_func_working_strerror_r = yes; then
- AC_DEFINE_UNQUOTED(HAVE_WORKING_STRERROR_R, 1,
- [Define to 1 if strerror_r returns a string.])
- fi
- ])
- fi
-])
+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);
+ ]])],
+ 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