1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
# setenv.m4 serial 6
dnl Copyright (C) 2001-2005 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([gt_FUNC_SETENV],
[
AC_LIBSOURCES([setenv.c, unsetenv.c, setenv.h])
AC_REPLACE_FUNCS(setenv unsetenv)
if test $ac_cv_func_setenv = no; then
gl_PREREQ_SETENV
fi
if test $ac_cv_func_unsetenv = no; then
gl_PREREQ_UNSETENV
else
AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
[AC_TRY_COMPILE([#include <stdlib.h>
extern
#ifdef __cplusplus
"C"
#endif
#if defined(__STDC__) || defined(__cplusplus)
int unsetenv (const char *name);
#else
int unsetenv();
#endif
], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
if test $gt_cv_func_unsetenv_ret = 'void'; then
AC_DEFINE(VOID_UNSETENV, 1, [Define if unsetenv() returns void, not int.])
fi
fi
])
# Check if a variable is properly declared.
# gt_CHECK_VAR_DECL(includes,variable)
AC_DEFUN([gt_CHECK_VAR_DECL],
[
define([gt_cv_var], [gt_cv_var_]$2[_declaration])
AC_MSG_CHECKING([if $2 is properly declared])
AC_CACHE_VAL(gt_cv_var, [
AC_TRY_COMPILE([$1
extern struct { int foo; } $2;],
[$2.foo = 1;],
gt_cv_var=no,
gt_cv_var=yes)])
AC_MSG_RESULT($gt_cv_var)
if test $gt_cv_var = yes; then
AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
[Define if you have the declaration of $2.])
fi
])
# Prerequisites of lib/setenv.c.
AC_DEFUN([gl_PREREQ_SETENV],
[
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_CHECK_HEADERS_ONCE(unistd.h)
AC_CHECK_HEADERS(search.h)
AC_CHECK_FUNCS(tsearch)
gt_CHECK_VAR_DECL([#include <errno.h>], errno)
gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
])
# Prerequisites of lib/unsetenv.c.
AC_DEFUN([gl_PREREQ_UNSETENV],
[
AC_CHECK_HEADERS_ONCE(unistd.h)
gt_CHECK_VAR_DECL([#include <errno.h>], errno)
gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
])
|
