strace/m4/st_save_restore_var.m4

#!/usr/bin/m4
#
# Copyright (c) 2016-2018 The strace developers.
# All rights reserved.
#
# SPDX-License-Identifier: LGPL-2.1-or-later

AC_DEFUN([st_SAVE_VAR], [dnl
AS_IF([test -n "${$1+set}"], [st_saved_$1="${$1}"; unset $1])
])

AC_DEFUN([st_RESTORE_VAR], [dnl
AS_IF([test -n "${st_saved_$1+set}"], [$1="${st_saved_$1}"; unset st_saved_$1])
])
Add copyright headers to some files that lack them We do our best to keep copyright headers up to date, yet git history provides better information on this subject and is more accurate than copyright headers. 2018-12-25 02:46:43 +03:00			`#!/usr/bin/m4`
			`#`
			`# Copyright (c) 2016-2018 The strace developers.`
			`# All rights reserved.`
			`#`
			`# SPDX-License-Identifier: LGPL-2.1-or-later`

m4: introduce st_SAVE_VAR and st_RESTORE_VAR macros These new macros are going to be needed for the upcoming AX_PROG_CC_FOR_BUILD change. * m4/st_save_restore_var.m4: New file. 2016-12-07 13:58:24 +03:00			`AC_DEFUN([st_SAVE_VAR], [dnl`
			`AS_IF([test -n "${$1+set}"], [st_saved_$1="${$1}"; unset $1])`
			`])`

			`AC_DEFUN([st_RESTORE_VAR], [dnl`
			`AS_IF([test -n "${st_saved_$1+set}"], [$1="${st_saved_$1}"; unset st_saved_$1])`
			`])`