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Diffstat (limited to 'm4/ax_build_date_epoch.m4')
| -rw-r--r-- | m4/ax_build_date_epoch.m4 | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/m4/ax_build_date_epoch.m4 b/m4/ax_build_date_epoch.m4 new file mode 100644 index 00000000..dbecb067 --- /dev/null +++ b/m4/ax_build_date_epoch.m4 @@ -0,0 +1,70 @@ +# =========================================================================== +# 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 |