emv@math.lsa.umich.edu (Edward Vielmetti) (03/20/90)
Larry,
I've started to put software around here under the control
of 'CVS', a version manager that sits on top of RCS. It's
supposed to cope with the idea of multiple people hacking
on the same code.
I have run into a problem using it to track perl, namely that
perl -v breaks because the RCS IDs are different. It comes
from these lines in perly.c,
case 'v':
fputs(rcsid,stdout);
fputs("\nCopyright (c) 1989, Larry Wall\n\n\
Perl may be copied only under the terms of the GNU General Public License,\n\
a copy of which can be found with the Perl 3.0 distribution kit.\n",stdout);
exit(0);
which dumps out the rcsid as the "version" tag. The
standard code that I have to decode this does
( $version ) = $] =~ /(\d+\.\d+).*\nPatch level/;
die "$program: requires at least version 3 of perl\n"
if $version < 3;
but since CVS changes the RCS ID to 1.1.1.1, I lose.
The solution for now is to
fputs("3.0\n",stdout);
which should do the right thing regardless, at least until
perl 4.0 comes out (not likely soon) or you go to a scheme
of "perl 3.2, patchlevel 17" (also seems unlikely).
--
--Ed
Edward Vielmetti, U of Michigan math dept.
emv@math.lsa.umich.edu