m4/ax_prog_date.m4

   1 # ===========================================================================
   2 #       https://www.gnu.org/software/autoconf-archive/ax_prog_date.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_PROG_DATE()
   8 #
   9 # DESCRIPTION
  10 #
  11 #   This macro tries to determine the type of the date (1) command and some
  12 #   of its non-standard capabilities.
  13 #
  14 #   The type is determined as follow:
  15 #
  16 #     * If the version string contains "GNU", then:
  17 #       - The variable ax_cv_prog_date_gnu is set to "yes".
  18 #       - The variable ax_cv_prog_date_type is set to "gnu".
  19 #
  20 #     * If date supports the "-v 1d" option, then:
  21 #       - The variable ax_cv_prog_date_bsd is set to "yes".
  22 #       - The variable ax_cv_prog_date_type is set to "bsd".
  23 #
  24 #     * If both previous checks fail, then:
  25 #       - The variable ax_cv_prog_date_type is set to "unknown".
  26 #
  27 #   The following capabilities of GNU date are checked:
  28 #
  29 #     * If date supports the --date arg option, then:
  30 #       - The variable ax_cv_prog_date_gnu_date is set to "yes".
  31 #
  32 #     * If date supports the --utc arg option, then:
  33 #       - The variable ax_cv_prog_date_gnu_utc is set to "yes".
  34 #
  35 #   The following capabilities of BSD date are checked:
  36 #
  37 #     * If date supports the -v 1d  option, then:
  38 #       - The variable ax_cv_prog_date_bsd_adjust is set to "yes".
  39 #
  40 #     * If date supports the -r arg option, then:
  41 #       - The variable ax_cv_prog_date_bsd_date is set to "yes".
  42 #
  43 #   All the aforementioned variables are set to "no" before a check is
  44 #   performed.
  45 #
  46 # LICENSE
  47 #
  48 #   Copyright (c) 2017 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
  49 #
  50 #   This program is free software: you can redistribute it and/or modify it
  51 #   under the terms of the GNU General Public License as published by the
  52 #   Free Software Foundation, either version 3 of the License, or (at your
  53 #   option) any later version.
  54 #
  55 #   This program is distributed in the hope that it will be useful, but
  56 #   WITHOUT ANY WARRANTY; without even the implied warranty of
  57 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  58 #   Public License for more details.
  59 #
  60 #   You should have received a copy of the GNU General Public License along
  61 #   with this program. If not, see <http://www.gnu.org/licenses/>.
  62 #
  63 #   As a special exception, the respective Autoconf Macro's copyright owner
  64 #   gives unlimited permission to copy, distribute and modify the configure
  65 #   scripts that are the output of Autoconf when processing the Macro. You
  66 #   need not follow the terms of the GNU General Public License when using
  67 #   or distributing such scripts, even though portions of the text of the
  68 #   Macro appear in them. The GNU General Public License (GPL) does govern
  69 #   all other use of the material that constitutes the Autoconf Macro.
  70 #
  71 #   This special exception to the GPL applies to versions of the Autoconf
  72 #   Macro released by the Autoconf Archive. When you make and distribute a
  73 #   modified version of the Autoconf Macro, you may extend this special
  74 #   exception to the GPL to apply to your modified version as well.
  75
  76 #serial 3
  77
  78 AC_DEFUN([AX_PROG_DATE], [dnl
  79   AC_CACHE_CHECK([for GNU date], [ax_cv_prog_date_gnu], [
  80     ax_cv_prog_date_gnu=no
  81     if date --version 2>/dev/null | head -1 | grep -q GNU
  82     then
  83       ax_cv_prog_date_gnu=yes
  84     fi
  85   ])
  86   AC_CACHE_CHECK([for BSD date], [ax_cv_prog_date_bsd], [
  87     ax_cv_prog_date_bsd=no
  88     if date -v 1d > /dev/null 2>&1
  89     then
  90       ax_cv_prog_date_bsd=yes
  91     fi
  92   ])
  93   AC_CACHE_CHECK([for date type], [ax_cv_prog_date_type], [
  94     ax_cv_prog_date_type=unknown
  95     if test "x${ax_cv_prog_date_gnu}" = "xyes"
  96     then
  97       ax_cv_prog_date_type=gnu
  98     elif test "x${ax_cv_prog_date_bsd}" = "xyes"
  99     then
 100       ax_cv_prog_date_type=bsd
 101     fi
 102   ])
 103   AS_VAR_IF([ax_cv_prog_date_gnu], [yes], [
 104     AC_CACHE_CHECK([whether GNU date supports --date], [ax_cv_prog_date_gnu_date], [
 105       ax_cv_prog_date_gnu_date=no
 106       if date --date=@1512031231 > /dev/null 2>&1
 107       then
 108         ax_cv_prog_date_gnu_date=yes
 109       fi
 110     ])
 111     AC_CACHE_CHECK([whether GNU date supports --utc], [ax_cv_prog_date_gnu_utc], [
 112       ax_cv_prog_date_gnu_utc=no
 113       if date --utc > /dev/null 2>&1
 114       then
 115         ax_cv_prog_date_gnu_utc=yes
 116       fi
 117     ])
 118   ])
 119   AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
 120     AC_CACHE_CHECK([whether BSD date supports -r], [ax_cv_prog_date_bsd_date], [
 121       ax_cv_prog_date_bsd_date=no
 122       if date -r 1512031231 > /dev/null 2>&1
 123       then
 124         ax_cv_prog_date_bsd_date=yes
 125       fi
 126     ])
 127   ])
 128     AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
 129     AC_CACHE_CHECK([whether BSD date supports -v], [ax_cv_prog_date_bsd_adjust], [
 130       ax_cv_prog_date_bsd_adjust=no
 131       if date -v 1d > /dev/null 2>&1
 132       then
 133         ax_cv_prog_date_bsd_adjust=yes
 134       fi
 135     ])
 136   ])
 137 ])dnl AX_PROG_DATE