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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_sys_perlsharpbang.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_SYS_PERLSHARPBANG
#
# DESCRIPTION
#
# Determine how the perl interpreter is located by the OS kernel and make
# substitution variable PERL_SHEBANG available. Does AC_PATH_PROG to find
# the path to perl. As a side-effect, that sets PERLINTERP and makes it
# available as a substitution variable.
#
# Note: The macro allows for the possibility (expected to be seldom used)
# of an explicit user override (the "user" being the operator executing
# the final 'configure' script, in this context) by making the option
# argument like:
#
# --with-perl-shebang='#! /my/funky/perlpath' # OR
# --with-perl-shebang='/my/funky/perlpath' # we just throw away the #! anyway
# # bec it must be absent in Makefile
#
# Rationale: The are various ways of starting an interpreter on different
# *nix-like systems. Many use the simple
#
# #!/usr/bin/perl
#
# but it could be instead
#
# #!/usr/local/bin/perl
#
# and there is even the possibility that the user wants
#
# #!/usr/bin/env perl
#
# to find whichever perl comes first in the current $PATH. This is
# preferred by some of us because we run multiple perl installations on
# the same box. Adjusting our $PATH then allows us to set precedence over
# other perls, even whatever the "house" version is.
#
# Users on very non-unix systems like MS Windows do not have a kernel that
# does this kind of thing from the first line of script files, but instead
# the perl on their machine is started and merely notices whatever comes
# after the interpreter path on this first line of the script (options
# like "-w").
#
# Acknowledgement: this macro was in part inspired by Dean Povey's
# AC_PROG_PERL_VERSION.
#
# LICENSE
#
# Copyright (c) 2009 Soren Andersen <somian@pobox.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 14
AC_DEFUN([AX_SYS_PERLSHARPBANG],[dnl
AC_PATH_PROG(PERLINTERP,perl,perl)
ac_cv_path_perlinterp="$PERLINTERP"
_sHpB='#!'
AC_ARG_WITH(perl-shebang,
AS_HELP_STRING([--with-perl-shebang],
[override what perl thinks is the way for the kernel to start it (seldom needed)]dnl
),
[opt_perl_shebang="$withval"]dnl
,dnl
[opt_perl_shebang="not_set"]dnl
)dnl
AC_CACHE_CHECK([whether explicit instead of detected sharpbang is to be used],
ax_cv_opt_perl_shebang,
[ case "$opt_perl_shebang" in
not_set ) ax_cv_opt_perl_shebang=''
;;
* )
ax_cv_opt_perl_shebang=`echo "$opt_perl_shebang" | sed -e's|^#!\s*\(.*\)$|\1|'`
esac
]dnl
)dnl
if test "A$ax_cv_opt_perl_shebang" != "A"
then
ac_cv_sys_kernshrpbang_perl="$ax_cv_opt_perl_shebang"
PERL_SHEBANG="$ac_cv_sys_kernshrpbang_perl"
AC_SUBST(PERL_SHEBANG)dnl
AC_MSG_NOTICE([OK - PERL_SHEBANG is $_sHpB$PERL_SHEBANG.])
# Automatic detection of sharpbang formula starts here
else dnl
_somian_shbangperl=`$PERLINTERP -V:startperl`
negclass="[[^']]"; dnl
# must leave this comment: m4 will remove the outer brackets for us, heheh
AC_CACHE_CHECK([for kernel sharpbang invocation to start perl],
ac_cv_sys_kernshrpbang_perl,
[_somian_kspb_perl=`echo "$_somian_shbangperl" | sed -ne"s|.*='\($negclass*\)';$|\1|p"`
if test "x$_somian_kspb_perl" == x
then _somian_ksbp_warn_empty='durnit'
else
case "A$_somian_kspb_perl" in
A#!*perl* )
ac_cv_sys_kernshrpbang_perl=`echo "$_somian_kspb_perl" | sed -e's|#!\(.*\)$|\1|'`
;;
A* ) _somian_ksbp_warn_defau='trouble'
ac_cv_sys_kernshrpbang_perl="$PERLINTERP"
esac
fi
])dnl Done with testing sharpbang
# The above prints Checking ... result message to user.
PERL_SHEBANG="$ac_cv_sys_kernshrpbang_perl"
AC_SUBST(PERL_SHEBANG)
if test A${_somian_ksbp_warn_empty+set} == Aset
then AC_MSG_WARN([dnl
In last check, doing $PERLINTERP -V:startperl yielded empty result! That should not happen.])
fi
# Inform user after printing result value
if test A${_somian_ksbp_warn_defau+set} == Aset
then AC_MSG_NOTICE([Maybe Not good -])
AC_MSG_WARN([dnl
In last check perl's Config query did not work so we bunted: $_sHpB$PERLINTERP])
else AC_MSG_NOTICE([OK Good result - ])
AC_MSG_NOTICE([dnl
In last check we got a proper-looking answer from perl's Config: $_somian_shbangperl])
dnl Done with user info messages
fi
dnl Outer loop checked for user override term here
fi dnl
])dnl EOMACRO DEF
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