putenv.m4
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putenv.m4
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	# putenv.m4 serial 18
	dnl Copyright (C) 2002-2011 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.

	dnl From Jim Meyering.
	dnl
	dnl Check whether putenv ("FOO") removes FOO from the environment.
	dnl The putenv in libc on at least SunOS 4.1.4 does not do that.

	AC_DEFUN([gl_FUNC_PUTENV],
	[
	AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
	AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
	[gl_cv_func_svid_putenv],
	[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
	/* Put it in env. */
	if (putenv ("CONFTEST_putenv=val"))
	return 1;

	/* Try to remove it. */
	if (putenv ("CONFTEST_putenv"))
	return 2;

	/* Make sure it was deleted. */
	if (getenv ("CONFTEST_putenv") != 0)
	return 3;

	return 0;
	]])],
	gl_cv_func_svid_putenv=yes,
	gl_cv_func_svid_putenv=no,
	dnl When crosscompiling, assume putenv is broken.
	gl_cv_func_svid_putenv=no)
	])
	if test $gl_cv_func_svid_putenv = no; then
	REPLACE_PUTENV=1
	fi
	])