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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
# setenv.m4 serial 26
dnl Copyright (C) 2001-2004, 2006-2012 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([gl_FUNC_SETENV],
[
AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
if test $ac_cv_func_setenv = no; then
HAVE_SETENV=0
else
AC_CACHE_CHECK([whether setenv validates arguments],
[gl_cv_func_setenv_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <errno.h>
#include <string.h>
]], [[
int result = 0;
{
if (setenv ("", "", 0) != -1)
result |= 1;
else if (errno != EINVAL)
result |= 2;
}
{
if (setenv ("a", "=", 1) != 0)
result |= 4;
else if (strcmp (getenv ("a"), "=") != 0)
result |= 8;
}
return result;
]])],
[gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_setenv_works="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_setenv_works="guessing no" ;;
esac
])])
case "$gl_cv_func_setenv_works" in
*yes) ;;
*)
REPLACE_SETENV=1
;;
esac
fi
])
# Like gl_FUNC_SETENV, except prepare for separate compilation
# (no REPLACE_SETENV, no AC_LIBOBJ).
AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_CHECK_DECLS_ONCE([setenv])
if test $ac_cv_have_decl_setenv = no; then
HAVE_DECL_SETENV=0
fi
AC_CHECK_FUNCS_ONCE([setenv])
gl_PREREQ_SETENV
])
AC_DEFUN([gl_FUNC_UNSETENV],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_DECLS_ONCE([unsetenv])
if test $ac_cv_have_decl_unsetenv = no; then
HAVE_DECL_UNSETENV=0
fi
AC_CHECK_FUNCS([unsetenv])
if test $ac_cv_func_unsetenv = no; then
HAVE_UNSETENV=0
else
HAVE_UNSETENV=1
dnl Some BSDs return void, failing to do error checking.
AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#undef _BSD
#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
#include <stdlib.h>
extern
#ifdef __cplusplus
"C"
#endif
int unsetenv (const char *name);
]],
[[]])],
[gt_cv_func_unsetenv_ret='int'],
[gt_cv_func_unsetenv_ret='void'])])
if test $gt_cv_func_unsetenv_ret = 'void'; then
AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
instead of int.])
REPLACE_UNSETENV=1
fi
dnl Solaris 10 unsetenv does not remove all copies of a name.
dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
dnl OpenBSD 4.7 unsetenv("") does not fail.
AC_CACHE_CHECK([whether unsetenv obeys POSIX],
[gl_cv_func_unsetenv_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <errno.h>
extern char **environ;
]], [[
char entry1[] = "a=1";
char entry2[] = "b=2";
char *env[] = { entry1, entry2, NULL };
if (putenv ((char *) "a=1")) return 1;
if (putenv (entry2)) return 2;
entry2[0] = 'a';
unsetenv ("a");
if (getenv ("a")) return 3;
if (!unsetenv ("") || errno != EINVAL) return 4;
entry2[0] = 'b';
environ = env;
if (!getenv ("a")) return 5;
entry2[0] = 'a';
unsetenv ("a");
if (getenv ("a")) return 6;
]])],
[gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_unsetenv_works="guessing no" ;;
esac
])])
case "$gl_cv_func_unsetenv_works" in
*yes) ;;
*)
REPLACE_UNSETENV=1
;;
esac
fi
])
# Prerequisites of lib/setenv.c.
AC_DEFUN([gl_PREREQ_SETENV],
[
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_REQUIRE([gl_ENVIRON])
AC_CHECK_HEADERS_ONCE([unistd.h])
AC_CHECK_HEADERS([search.h])
AC_CHECK_FUNCS([tsearch])
])
# Prerequisites of lib/unsetenv.c.
AC_DEFUN([gl_PREREQ_UNSETENV],
[
AC_REQUIRE([gl_ENVIRON])
AC_CHECK_HEADERS_ONCE([unistd.h])
])
|
