-# setenv.m4 serial 20
+# setenv.m4 serial 21
dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
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 entry[] = "b=2";
+ char entry1[] = "a=1";
+ char entry2[] = "b=2";
+ char *env[] = { entry1, entry2, NULL };
if (putenv ((char *) "a=1")) return 1;
- if (putenv (entry)) return 2;
- entry[0] = 'a';
+ 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],
[gl_cv_func_unsetenv_works="guessing no"])])