-# setenv.m4 serial 18
-dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc.
+# 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,
dnl with or without modifications, as long as this notice is preserved.
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])
if test $ac_cv_func_setenv = no; then
HAVE_SETENV=0
#include <errno.h>
#include <string.h>
]], [[
- if (setenv ("", "", 0) != -1) return 1;
- if (errno != EINVAL) return 2;
- if (setenv ("a", "=", 1) != 0) return 3;
- if (strcmp (getenv ("a"), "=") != 0) return 4;
+ 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],
[gl_cv_func_setenv_works="guessing no"])])
AC_DEFUN([gl_FUNC_UNSETENV],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ 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
AC_LIBOBJ([unsetenv])
gl_PREREQ_UNSETENV
else
[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
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"])])