2 dnl Copyright (C) 2001-2004 Free Software Foundation, Inc.
3 dnl This file is free software, distributed under the terms of the GNU
4 dnl General Public License. As a special exception to the GNU General
5 dnl Public License, this file may be distributed as part of a program
6 dnl that contains a configuration script generated by Autoconf, under
7 dnl the same distribution terms as the rest of that program.
9 AC_DEFUN([gt_FUNC_SETENV],
11 AC_REPLACE_FUNCS(setenv unsetenv)
12 if test $ac_cv_func_setenv = no; then
15 if test $ac_cv_func_unsetenv = no; then
18 AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
19 [AC_TRY_COMPILE([#include <stdlib.h>
24 #if defined(__STDC__) || defined(__cplusplus)
25 int unsetenv (const char *name);
29 ], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
30 if test $gt_cv_func_unsetenv_ret = 'void'; then
31 AC_DEFINE(VOID_UNSETENV, 1, [Define if unsetenv() returns void, not int.])
36 # Check if a variable is properly declared.
37 # gt_CHECK_VAR_DECL(includes,variable)
38 AC_DEFUN([gt_CHECK_VAR_DECL],
40 define([gt_cv_var], [gt_cv_var_]$2[_declaration])
41 AC_MSG_CHECKING([if $2 is properly declared])
42 AC_CACHE_VAL(gt_cv_var, [
44 extern struct { int foo; } $2;],
48 AC_MSG_RESULT($gt_cv_var)
49 if test $gt_cv_var = yes; then
50 AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
51 [Define if you have the declaration of $2.])
55 # Prerequisites of lib/setenv.c.
56 AC_DEFUN([gl_PREREQ_SETENV],
58 AC_REQUIRE([AC_FUNC_ALLOCA])
59 AC_CHECK_HEADERS_ONCE(unistd.h)
60 AC_CHECK_HEADERS(search.h)
61 AC_CHECK_FUNCS(tsearch)
62 gt_CHECK_VAR_DECL([#include <errno.h>], errno)
63 gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
66 # Prerequisites of lib/unsetenv.c.
67 AC_DEFUN([gl_PREREQ_UNSETENV],
69 AC_CHECK_HEADERS_ONCE(unistd.h)
70 gt_CHECK_VAR_DECL([#include <errno.h>], errno)
71 gt_CHECK_VAR_DECL([#include <unistd.h>], environ)