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