dist-3.0 is dead and gone. Mention actual state of affairs

[metaconfig.git] / dist-3.0at70b / mcon / U / startperl.U

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-?RCS: $Id: startperl.U,v 3.0.1.1 1997/02/28 16:25:06 ram Exp $
-?RCS:
-?RCS: Copyright (c) 1991-1993, Raphael Manfredi
-?RCS: 
-?RCS: You may redistribute only under the terms of the Artistic Licence,
-?RCS: as specified in the README file that comes with the distribution.
-?RCS: You may reuse parts of this distribution only within the terms of
-?RCS: that same Artistic Licence; a copy of which may be found at the root
-?RCS: of the source tree for dist 3.0.
-?RCS:
-?RCS: $Log: startperl.U,v $
-?RCS: Revision 3.0.1.1  1997/02/28  16:25:06  ram
-?RCS: patch61: warn them if the #! line is too long for their OS
-?RCS:
-?RCS: Revision 3.0  1993/08/18  12:09:50  ram
-?RCS: Baseline for dist 3.0 netwide release.
-?RCS:
-?MAKE:startperl: cat rm sharpbang perlpath d_portable Myread
-?MAKE: -pick add $@ %<
-?S:startperl:
-?S:    This variable contains the string to put on the front of a perl
-?S:    script to make sure (hopefully) that it runs with perl and not some
-?S:    shell. Of course, that leading line must be followed by the classical
-?S:    perl idiom:
-?S:            eval 'exec perl -S $0 ${1+"$@"}'
-?S:                    if $running_under_some_shell;
-?S:    to guarantee perl startup should the shell execute the script. Note
-?S:    that this magic incatation is not understood by csh.
-?S:.
-?C:STARTPERL:
-?C:    This symbol is the string that should be put on the front of a
-?C:    perl script to make sure (hopefully) that it runs with perl and
-?C:    not under some shell. That line should be followed by the classical
-?C:    invocation magic:
-?C:            eval 'exec perl -S $0 ${1+"$@"}'
-?C:                    if $running_under_some_shell;
-?C:    to guarantee perl startup should the shell execute the script at first.
-?C:.
-?H:#define STARTPERL "$startperl"
-?H:.
-?T:pdflt
-?F:!xtry
-: figure out how to guarantee perl startup
-case "$sharpbang" in
-*!)
-?X:
-?X: Make sure the #!$perlpath magic incantation indeed works on this
-?X: system... It might not if the length of the #! hook is greater
-?X: than some hardwired kernel limit. -- RAM, 15/03/96
-?X:
-       $cat >xtry <<EOP
-#!$perlpath
-system("exit 0");
-EOP
-       chmod a+x xtry
-       if ./xtry >/dev/null 2>&1; then
-               $cat <<EOH
-
-I can use the #! construct to start perl on your system. This will make
-startup of perl scripts faster, but may cause problems if you want to share
-those scripts and perl is not in a standard place (/usr/bin/perl) on all your
-platforms. The alternative is to force a shell by starting the script with a
-single ':' character.
-
-EOH
-               pdflt=y
-       else
-               $cat <<EOH
-
-I could use the #! construct to start perl on your system, but using
-    #!$perlpath
-would be too long for your kernel to grok. Indeed, most systems do
-limit the size of the leading #! string to 32 characters.
-
-EOH
-               pdflt=n
-       fi
-       $rm -f xtry
-       case "$startperl" in
-       *!*) dflt=y;;
-       '') case "$d_portable" in
-               "$define") dflt=n;;
-               *) dflt=$pdflt;;
-               esac;;
-       esac
-       rp='Shall I use #! to start up perl?'
-       . ./myread
-       case "$ans" in
-       y*|Y*) startperl="#!$perlpath";;
-       *) startperl=": # use perl";;
-       esac;;
-*) startperl=": # use perl";;
-esac
-