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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_date.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_DATE()
#
# DESCRIPTION
#
# This macro tries to determine the type of the date (1) command and some
# of its non-standard capabilities.
#
# The type is determined as follow:
#
# * If the version string contains "GNU", then:
# - The variable ax_cv_prog_date_gnu is set to "yes".
# - The variable ax_cv_prog_date_type is set to "gnu".
#
# * If date supports the "-v 1d" option, then:
# - The variable ax_cv_prog_date_bsd is set to "yes".
# - The variable ax_cv_prog_date_type is set to "bsd".
#
# * If both previous checks fail, then:
# - The variable ax_cv_prog_date_type is set to "unknown".
#
# The following capabilities of GNU date are checked:
#
# * If date supports the --date arg option, then:
# - The variable ax_cv_prog_date_gnu_date is set to "yes".
#
# * If date supports the --utc arg option, then:
# - The variable ax_cv_prog_date_gnu_utc is set to "yes".
#
# The following capabilities of BSD date are checked:
#
# * If date supports the -v 1d option, then:
# - The variable ax_cv_prog_date_bsd_adjust is set to "yes".
#
# * If date supports the -r arg option, then:
# - The variable ax_cv_prog_date_bsd_date is set to "yes".
#
# All the aforementioned variables are set to "no" before a check is
# performed.
#
# LICENSE
#
# Copyright (c) 2017 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
#
# 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 <http://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 3
AC_DEFUN([AX_PROG_DATE], [dnl
AC_CACHE_CHECK([for GNU date], [ax_cv_prog_date_gnu], [
ax_cv_prog_date_gnu=no
if date --version 2>/dev/null | head -1 | grep -q GNU
then
ax_cv_prog_date_gnu=yes
fi
])
AC_CACHE_CHECK([for BSD date], [ax_cv_prog_date_bsd], [
ax_cv_prog_date_bsd=no
if date -v 1d > /dev/null 2>&1
then
ax_cv_prog_date_bsd=yes
fi
])
AC_CACHE_CHECK([for date type], [ax_cv_prog_date_type], [
ax_cv_prog_date_type=unknown
if test "x${ax_cv_prog_date_gnu}" = "xyes"
then
ax_cv_prog_date_type=gnu
elif test "x${ax_cv_prog_date_bsd}" = "xyes"
then
ax_cv_prog_date_type=bsd
fi
])
AS_VAR_IF([ax_cv_prog_date_gnu], [yes], [
AC_CACHE_CHECK([whether GNU date supports --date], [ax_cv_prog_date_gnu_date], [
ax_cv_prog_date_gnu_date=no
if date --date=@1512031231 > /dev/null 2>&1
then
ax_cv_prog_date_gnu_date=yes
fi
])
AC_CACHE_CHECK([whether GNU date supports --utc], [ax_cv_prog_date_gnu_utc], [
ax_cv_prog_date_gnu_utc=no
if date --utc > /dev/null 2>&1
then
ax_cv_prog_date_gnu_utc=yes
fi
])
])
AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
AC_CACHE_CHECK([whether BSD date supports -r], [ax_cv_prog_date_bsd_date], [
ax_cv_prog_date_bsd_date=no
if date -r 1512031231 > /dev/null 2>&1
then
ax_cv_prog_date_bsd_date=yes
fi
])
])
AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
AC_CACHE_CHECK([whether BSD date supports -v], [ax_cv_prog_date_bsd_adjust], [
ax_cv_prog_date_bsd_adjust=no
if date -v 1d > /dev/null 2>&1
then
ax_cv_prog_date_bsd_adjust=yes
fi
])
])
])dnl AX_PROG_DATE
|
