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