m4/strerror_r.m4

   1 #serial 1003
   2 # Experimental replacement for the function in the latest CVS autoconf.
   3 # Use with the error.c file in ../lib.
   4
   5 # Copyright 2001 Free Software Foundation, Inc.
   6
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2, or (at your option)
  10 # any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software Foundation,
  19 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 undefine([AC_FUNC_STRERROR_R])
  22
  23 # AC_FUNC_STRERROR_R
  24 # ------------------
  25 AC_DEFUN([AC_FUNC_STRERROR_R],
  26 [AC_CHECK_DECLS([strerror_r])
  27 AC_CHECK_FUNCS([strerror_r])
  28 AC_CACHE_CHECK([whether strerror_r returns char *],
  29                ac_cv_func_strerror_r_char_p,
  30    [
  31     ac_cv_func_strerror_r_char_p=no
  32     if test $ac_cv_have_decl_strerror_r = yes; then
  33       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
  34         [[
  35           char buf[100];
  36           char x = *strerror_r (0, buf, sizeof buf);
  37           char *p = strerror_r (0, buf, sizeof buf);
  38         ]])],
  39                         ac_cv_func_strerror_r_char_p=yes)
  40     else
  41       # strerror_r is not declared.  Choose between
  42       # systems that have relatively inaccessible declarations for the
  43       # function.  BeOS and DEC UNIX 4.0 fall in this category, but the
  44       # former has a strerror_r that returns char*, while the latter
  45       # has a strerror_r that returns `int'.
  46       # This test should segfault on the DEC system.
  47       AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
  48         extern char *strerror_r ();],
  49         [[char buf[100];
  50           char x = *strerror_r (0, buf, sizeof buf);
  51           exit (!isalpha (x));]])],
  52                     ac_cv_func_strerror_r_char_p=yes, , :)
  53     fi
  54   ])
  55 if test $ac_cv_func_strerror_r_char_p = yes; then
  56   AC_DEFINE([STRERROR_R_CHAR_P], 1,
  57             [Define to 1 if strerror_r returns char *.])
  58 fi
  59 ])# AC_FUNC_STRERROR_R