|
- # ===========================================================================
- # https://www.gnu.org/software/autoconf-archive/ax_build_date_epoch.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_BUILD_DATE_EPOCH(VARIABLE[, FORMAT[, ACTION-IF-FAIL]])
- #
- # DESCRIPTION
- #
- # Sets VARIABLE to a string representing the current time. It is
- # formatted according to FORMAT if specified, otherwise it is formatted as
- # the number of seconds (excluding leap seconds) since the UNIX epoch (01
- # Jan 1970 00:00:00 UTC).
- #
- # If the SOURCE_DATE_EPOCH environment variable is set, it uses the value
- # of that variable instead of the current time. See
- # https://reproducible-builds.org/specs/source-date-epoch). If
- # SOURCE_DATE_EPOCH is set but cannot be properly interpreted as a UNIX
- # timestamp, then execute ACTION-IF-FAIL if specified, otherwise error.
- #
- # VARIABLE is AC_SUBST-ed.
- #
- # LICENSE
- #
- # Copyright (c) 2016 Eric Bavier <bavier@member.fsf.org>
- #
- # This program is free software: you can redistribute it and/or modify it
- # under the terms of the GNU General Public License as published by the
- # Free Software Foundation, either version 3 of the License, or (at your
- # option) any later version.
- #
- # This program is distributed in the hope that it will be useful, but
- # WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
- # Public License for more details.
- #
- # You should have received a copy of the GNU General Public License along
- # with this program. If not, see <https://www.gnu.org/licenses/>.
- #
- # As a special exception, the respective Autoconf Macro's copyright owner
- # gives unlimited permission to copy, distribute and modify the configure
- # scripts that are the output of Autoconf when processing the Macro. You
- # need not follow the terms of the GNU General Public License when using
- # or distributing such scripts, even though portions of the text of the
- # Macro appear in them. The GNU General Public License (GPL) does govern
- # all other use of the material that constitutes the Autoconf Macro.
- #
- # This special exception to the GPL applies to versions of the Autoconf
- # Macro released by the Autoconf Archive. When you make and distribute a
- # modified version of the Autoconf Macro, you may extend this special
- # exception to the GPL to apply to your modified version as well.
-
- #serial 2
-
- AC_DEFUN([AX_BUILD_DATE_EPOCH],
- [dnl
- AC_MSG_CHECKING([for build time])
- ax_date_fmt="m4_default($2,%s)"
- AS_IF([test x"$SOURCE_DATE_EPOCH" = x],
- [$1=`date "+$ax_date_fmt"`],
- [ax_build_date=`date -u -d "@$SOURCE_DATE_EPOCH" "+$ax_date_fmt" 2>/dev/null \
- || date -u -r "$SOURCE_DATE_EPOCH" "+$ax_date_fmt" 2>/dev/null`
- AS_IF([test x"$ax_build_date" = x],
- [m4_ifval([$3],
- [$3],
- [AC_MSG_ERROR([malformed SOURCE_DATE_EPOCH])])],
- [$1=$ax_build_date])])
- AC_MSG_RESULT([$$1])
- ])dnl AX_BUILD_DATE_EPOCH
|
