2 dnl Copyright (C) 2001-2004, 2006-2010 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.
7 AC_DEFUN([gl_FUNC_SETENV],
9 AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
10 if test $HAVE_SETENV$REPLACE_SETENV != 10; then
15 # Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
16 AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
18 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
19 AC_CHECK_FUNCS_ONCE([setenv])
20 if test $ac_cv_func_setenv = no; then
23 AC_CACHE_CHECK([whether setenv validates arguments],
24 [gl_cv_func_setenv_works],
25 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
32 if (setenv ("", "", 0) != -1)
34 else if (errno != EINVAL)
38 if (setenv ("a", "=", 1) != 0)
40 else if (strcmp (getenv ("a"), "=") != 0)
45 [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
46 [gl_cv_func_setenv_works="guessing no"])])
47 if test "$gl_cv_func_setenv_works" != yes; then
55 AC_DEFUN([gl_FUNC_UNSETENV],
57 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
58 AC_CHECK_FUNCS([unsetenv])
59 if test $ac_cv_func_unsetenv = no; then
64 dnl Some BSDs return void, failing to do error checking.
65 AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
74 #if defined(__STDC__) || defined(__cplusplus)
75 int unsetenv (const char *name);
81 [gt_cv_func_unsetenv_ret='int'],
82 [gt_cv_func_unsetenv_ret='void'])])
83 if test $gt_cv_func_unsetenv_ret = 'void'; then
84 AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
90 dnl Solaris 10 unsetenv does not remove all copies of a name.
91 dnl OpenBSD 4.7 unsetenv("") does not fail.
92 AC_CACHE_CHECK([whether unsetenv obeys POSIX],
93 [gl_cv_func_unsetenv_works],
94 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
99 if (putenv ((char *) "a=1")) return 1;
100 if (putenv (entry)) return 2;
103 if (getenv ("a")) return 3;
104 if (!unsetenv ("") || errno != EINVAL) return 4;
106 [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
107 [gl_cv_func_unsetenv_works="guessing no"])])
108 if test "$gl_cv_func_unsetenv_works" != yes; then
110 AC_LIBOBJ([unsetenv])
115 # Prerequisites of lib/setenv.c.
116 AC_DEFUN([gl_PREREQ_SETENV],
118 AC_REQUIRE([AC_FUNC_ALLOCA])
119 AC_REQUIRE([gl_ENVIRON])
120 AC_CHECK_HEADERS_ONCE([unistd.h])
121 AC_CHECK_HEADERS([search.h])
122 AC_CHECK_FUNCS([tsearch])
125 # Prerequisites of lib/unsetenv.c.
126 AC_DEFUN([gl_PREREQ_UNSETENV],
128 AC_REQUIRE([gl_ENVIRON])
129 AC_CHECK_HEADERS_ONCE([unistd.h])