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      1 # ===========================================================================
      2 #   https://www.gnu.org/software/autoconf-archive/ax_prog_perl_version.html
      3 # ===========================================================================
      4 #
      5 # SYNOPSIS
      6 #
      7 #   AX_PROG_PERL_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
      8 #
      9 # DESCRIPTION
     10 #
     11 #   Makes sure that perl supports the version indicated. If true the shell
     12 #   commands in ACTION-IF-TRUE are executed. If not the shell commands in
     13 #   ACTION-IF-FALSE are run. Note if $PERL is not set (for example by
     14 #   running AC_CHECK_PROG or AC_PATH_PROG) the macro will fail.
     15 #
     16 #   Example:
     17 #
     18 #     AC_PATH_PROG([PERL],[perl])
     19 #     AX_PROG_PERL_VERSION([5.8.0],[ ... ],[ ... ])
     20 #
     21 #   This will check to make sure that the perl you have supports at least
     22 #   version 5.8.0.
     23 #
     24 #   NOTE: This macro uses the $PERL variable to perform the check.
     25 #   AX_WITH_PERL can be used to set that variable prior to running this
     26 #   macro. The $PERL_VERSION variable will be valorized with the detected
     27 #   version.
     28 #
     29 # LICENSE
     30 #
     31 #   Copyright (c) 2009 Francesco Salvestrini <salvestrini (a] users.sourceforge.net>
     32 #
     33 #   Copying and distribution of this file, with or without modification, are
     34 #   permitted in any medium without royalty provided the copyright notice
     35 #   and this notice are preserved. This file is offered as-is, without any
     36 #   warranty.
     37 
     38 #serial 13
     39 
     40 AC_DEFUN([AX_PROG_PERL_VERSION],[
     41     AC_REQUIRE([AC_PROG_SED])
     42     AC_REQUIRE([AC_PROG_GREP])
     43 
     44     AS_IF([test -n "$PERL"],[
     45         ax_perl_version="$1"
     46 
     47         AC_MSG_CHECKING([for perl version])
     48         changequote(<<,>>)
     49         perl_version=`$PERL --version 2>&1 \
     50           | $SED -n -e '/This is perl/b inspect
     51 b
     52 : inspect
     53 s/.* (\{0,1\}v\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\} .*/\1/;p'`
     54         changequote([,])
     55         AC_MSG_RESULT($perl_version)
     56 
     57 	AC_SUBST([PERL_VERSION],[$perl_version])
     58 
     59         AX_COMPARE_VERSION([$ax_perl_version],[le],[$perl_version],[
     60 	    :
     61             $2
     62         ],[
     63 	    :
     64             $3
     65         ])
     66     ],[
     67         AC_MSG_WARN([could not find the perl interpreter])
     68         $3
     69     ])
     70 ])
     71