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c0c3707f CB |
1 | # setenv.m4 serial 29 |
2 | dnl Copyright (C) 2001-2004, 2006-2019 Free Software Foundation, Inc. | |
3d99e817 AK |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_SETENV], | |
8 | [ | |
9 | AC_REQUIRE([gl_FUNC_SETENV_SEPARATE]) | |
10 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
11 | if test $ac_cv_func_setenv = no; then | |
12 | HAVE_SETENV=0 | |
13 | else | |
14 | AC_CACHE_CHECK([whether setenv validates arguments], | |
15 | [gl_cv_func_setenv_works], | |
16 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
17 | #include <stdlib.h> | |
18 | #include <errno.h> | |
19 | #include <string.h> | |
20 | ]], [[ | |
21 | int result = 0; | |
22 | { | |
23 | if (setenv ("", "", 0) != -1) | |
24 | result |= 1; | |
25 | else if (errno != EINVAL) | |
26 | result |= 2; | |
27 | } | |
28 | { | |
29 | if (setenv ("a", "=", 1) != 0) | |
30 | result |= 4; | |
31 | else if (strcmp (getenv ("a"), "=") != 0) | |
32 | result |= 8; | |
33 | } | |
34 | return result; | |
35 | ]])], | |
36 | [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no], | |
37 | [case "$host_os" in | |
c0c3707f CB |
38 | # Guess yes on glibc systems. |
39 | *-gnu* | gnu*) gl_cv_func_setenv_works="guessing yes" ;; | |
40 | # Guess yes on musl systems. | |
41 | *-musl*) gl_cv_func_setenv_works="guessing yes" ;; | |
42 | # If we don't know, obey --enable-cross-guesses. | |
43 | *) gl_cv_func_setenv_works="$gl_cross_guess_normal" ;; | |
3d99e817 AK |
44 | esac |
45 | ])]) | |
46 | case "$gl_cv_func_setenv_works" in | |
47 | *yes) ;; | |
48 | *) | |
49 | REPLACE_SETENV=1 | |
50 | ;; | |
51 | esac | |
52 | fi | |
53 | ]) | |
54 | ||
55 | # Like gl_FUNC_SETENV, except prepare for separate compilation | |
56 | # (no REPLACE_SETENV, no AC_LIBOBJ). | |
57 | AC_DEFUN([gl_FUNC_SETENV_SEPARATE], | |
58 | [ | |
59 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
60 | AC_CHECK_DECLS_ONCE([setenv]) | |
61 | if test $ac_cv_have_decl_setenv = no; then | |
62 | HAVE_DECL_SETENV=0 | |
63 | fi | |
64 | AC_CHECK_FUNCS_ONCE([setenv]) | |
65 | gl_PREREQ_SETENV | |
66 | ]) | |
67 | ||
68 | AC_DEFUN([gl_FUNC_UNSETENV], | |
69 | [ | |
70 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
71 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
72 | AC_CHECK_DECLS_ONCE([unsetenv]) | |
73 | if test $ac_cv_have_decl_unsetenv = no; then | |
74 | HAVE_DECL_UNSETENV=0 | |
75 | fi | |
76 | AC_CHECK_FUNCS([unsetenv]) | |
77 | if test $ac_cv_func_unsetenv = no; then | |
78 | HAVE_UNSETENV=0 | |
79 | else | |
80 | HAVE_UNSETENV=1 | |
81 | dnl Some BSDs return void, failing to do error checking. | |
82 | AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret], | |
83 | [AC_COMPILE_IFELSE( | |
84 | [AC_LANG_PROGRAM( | |
85 | [[ | |
86 | #undef _BSD | |
87 | #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */ | |
88 | #include <stdlib.h> | |
89 | extern | |
90 | #ifdef __cplusplus | |
91 | "C" | |
92 | #endif | |
93 | int unsetenv (const char *name); | |
94 | ]], | |
95 | [[]])], | |
96 | [gt_cv_func_unsetenv_ret='int'], | |
97 | [gt_cv_func_unsetenv_ret='void'])]) | |
98 | if test $gt_cv_func_unsetenv_ret = 'void'; then | |
99 | AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void | |
100 | instead of int.]) | |
101 | REPLACE_UNSETENV=1 | |
102 | fi | |
103 | ||
104 | dnl Solaris 10 unsetenv does not remove all copies of a name. | |
105 | dnl Haiku alpha 2 unsetenv gets confused by assignment to environ. | |
106 | dnl OpenBSD 4.7 unsetenv("") does not fail. | |
107 | AC_CACHE_CHECK([whether unsetenv obeys POSIX], | |
108 | [gl_cv_func_unsetenv_works], | |
109 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
110 | #include <stdlib.h> | |
111 | #include <errno.h> | |
112 | extern char **environ; | |
113 | ]], [[ | |
114 | char entry1[] = "a=1"; | |
115 | char entry2[] = "b=2"; | |
116 | char *env[] = { entry1, entry2, NULL }; | |
117 | if (putenv ((char *) "a=1")) return 1; | |
118 | if (putenv (entry2)) return 2; | |
119 | entry2[0] = 'a'; | |
120 | unsetenv ("a"); | |
121 | if (getenv ("a")) return 3; | |
122 | if (!unsetenv ("") || errno != EINVAL) return 4; | |
123 | entry2[0] = 'b'; | |
124 | environ = env; | |
125 | if (!getenv ("a")) return 5; | |
126 | entry2[0] = 'a'; | |
127 | unsetenv ("a"); | |
128 | if (getenv ("a")) return 6; | |
129 | ]])], | |
130 | [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no], | |
131 | [case "$host_os" in | |
132 | # Guess yes on glibc systems. | |
133 | *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;; | |
c0c3707f CB |
134 | # If we don't know, obey --enable-cross-guesses. |
135 | *) gl_cv_func_unsetenv_works="$gl_cross_guess_normal" ;; | |
3d99e817 AK |
136 | esac |
137 | ])]) | |
138 | case "$gl_cv_func_unsetenv_works" in | |
139 | *yes) ;; | |
140 | *) | |
141 | REPLACE_UNSETENV=1 | |
142 | ;; | |
143 | esac | |
144 | fi | |
145 | ]) | |
146 | ||
147 | # Prerequisites of lib/setenv.c. | |
148 | AC_DEFUN([gl_PREREQ_SETENV], | |
149 | [ | |
150 | AC_REQUIRE([AC_FUNC_ALLOCA]) | |
151 | AC_REQUIRE([gl_ENVIRON]) | |
152 | AC_CHECK_HEADERS_ONCE([unistd.h]) | |
153 | AC_CHECK_HEADERS([search.h]) | |
154 | AC_CHECK_FUNCS([tsearch]) | |
155 | ]) | |
156 | ||
157 | # Prerequisites of lib/unsetenv.c. | |
158 | AC_DEFUN([gl_PREREQ_UNSETENV], | |
159 | [ | |
160 | AC_REQUIRE([gl_ENVIRON]) | |
161 | AC_CHECK_HEADERS_ONCE([unistd.h]) | |
162 | ]) |