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1 office 1 # setenv.m4 serial 24
2 dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc.
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 if test $ac_cv_func_setenv = no; then
11 HAVE_SETENV=0
12 else
13 AC_CACHE_CHECK([whether setenv validates arguments],
14 [gl_cv_func_setenv_works],
15 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
16 #include <stdlib.h>
17 #include <errno.h>
18 #include <string.h>
19 ]], [[
20 int result = 0;
21 {
22 if (setenv ("", "", 0) != -1)
23 result |= 1;
24 else if (errno != EINVAL)
25 result |= 2;
26 }
27 {
28 if (setenv ("a", "=", 1) != 0)
29 result |= 4;
30 else if (strcmp (getenv ("a"), "=") != 0)
31 result |= 8;
32 }
33 return result;
34 ]])],
35 [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
36 [gl_cv_func_setenv_works="guessing no"])])
37 if test "$gl_cv_func_setenv_works" != yes; then
38 REPLACE_SETENV=1
39 fi
40 fi
41 ])
42  
43 # Like gl_FUNC_SETENV, except prepare for separate compilation
44 # (no REPLACE_SETENV, no AC_LIBOBJ).
45 AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
46 [
47 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
48 AC_CHECK_DECLS_ONCE([setenv])
49 if test $ac_cv_have_decl_setenv = no; then
50 HAVE_DECL_SETENV=0
51 fi
52 AC_CHECK_FUNCS_ONCE([setenv])
53 gl_PREREQ_SETENV
54 ])
55  
56 AC_DEFUN([gl_FUNC_UNSETENV],
57 [
58 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
59 AC_CHECK_DECLS_ONCE([unsetenv])
60 if test $ac_cv_have_decl_unsetenv = no; then
61 HAVE_DECL_UNSETENV=0
62 fi
63 AC_CHECK_FUNCS([unsetenv])
64 if test $ac_cv_func_unsetenv = no; then
65 HAVE_UNSETENV=0
66 else
67 HAVE_UNSETENV=1
68 dnl Some BSDs return void, failing to do error checking.
69 AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
70 [AC_COMPILE_IFELSE(
71 [AC_LANG_PROGRAM(
72 [[
73 #undef _BSD
74 #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
75 #include <stdlib.h>
76 extern
77 #ifdef __cplusplus
78 "C"
79 #endif
80 #if defined(__STDC__) || defined(__cplusplus)
81 int unsetenv (const char *name);
82 #else
83 int unsetenv();
84 #endif
85 ]],
86 [[]])],
87 [gt_cv_func_unsetenv_ret='int'],
88 [gt_cv_func_unsetenv_ret='void'])])
89 if test $gt_cv_func_unsetenv_ret = 'void'; then
90 AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
91 instead of int.])
92 REPLACE_UNSETENV=1
93 fi
94  
95 dnl Solaris 10 unsetenv does not remove all copies of a name.
96 dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
97 dnl OpenBSD 4.7 unsetenv("") does not fail.
98 AC_CACHE_CHECK([whether unsetenv obeys POSIX],
99 [gl_cv_func_unsetenv_works],
100 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
101 #include <stdlib.h>
102 #include <errno.h>
103 extern char **environ;
104 ]], [[
105 char entry1[] = "a=1";
106 char entry2[] = "b=2";
107 char *env[] = { entry1, entry2, NULL };
108 if (putenv ((char *) "a=1")) return 1;
109 if (putenv (entry2)) return 2;
110 entry2[0] = 'a';
111 unsetenv ("a");
112 if (getenv ("a")) return 3;
113 if (!unsetenv ("") || errno != EINVAL) return 4;
114 entry2[0] = 'b';
115 environ = env;
116 if (!getenv ("a")) return 5;
117 entry2[0] = 'a';
118 unsetenv ("a");
119 if (getenv ("a")) return 6;
120 ]])],
121 [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
122 [gl_cv_func_unsetenv_works="guessing no"])])
123 if test "$gl_cv_func_unsetenv_works" != yes; then
124 REPLACE_UNSETENV=1
125 fi
126 fi
127 ])
128  
129 # Prerequisites of lib/setenv.c.
130 AC_DEFUN([gl_PREREQ_SETENV],
131 [
132 AC_REQUIRE([AC_FUNC_ALLOCA])
133 AC_REQUIRE([gl_ENVIRON])
134 AC_CHECK_HEADERS_ONCE([unistd.h])
135 AC_CHECK_HEADERS([search.h])
136 AC_CHECK_FUNCS([tsearch])
137 ])
138  
139 # Prerequisites of lib/unsetenv.c.
140 AC_DEFUN([gl_PREREQ_UNSETENV],
141 [
142 AC_REQUIRE([gl_ENVIRON])
143 AC_CHECK_HEADERS_ONCE([unistd.h])
144 ])