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Mail Archives: cygwin-apps/2002/04/26/14:33:53

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Message-ID: <3CC99AFC.4080009@ece.gatech.edu>
Date: Fri, 26 Apr 2002 14:22:52 -0400
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
CC: Jan Nieuwenhuizen <janneke AT gnu DOT org>, cygwin-apps AT cygwin DOT com
Subject: Re: ITP: netpbm
References: <87r8l2pf8w DOT fsf AT peder DOT flower> <3CC998A6 DOT 3030104 AT ece DOT gatech DOT edu>

Oh, yeah, one other thing: runtime requirement is probably either 
libpng2 or libpng10, not 'libpng'.  Build requirement is either libpng 
or libpng10-devel.  (the first of each pair if 1.0.12, the second of 
each pair if 1.0.13).

Okay, *two* more things: you may want to package this "the right way" 
from the beginning -- and avoid the pain I (and everyone else by proxy) 
went thru.  Split out your DLLs from everything else and have two 
packages...'netpbm' and 'libpnmXX'.  That way, when user bob builds 
gnuplot against your 'libpnm1' DLLs, his gnuplot will still work even 
after he upgrades to your newer netpbm package and libpnm2 DLLs -- 
because libpnm2 will (a) contain DLLs with names that are different from 
those in libpnm1, (b) can coexist on the same machine.

Naturally, you'd only bump the libpnmX package number (and DLL numbers) 
when there was a backwards-incompatible change; ordinarily you'd just 
release a new libpnm1 package and overwrite the old DLLs with 
new-and-improved, but compatible, DLLs.

Now that I think about it, you might want to split ALL of the DLLs into 
separate libpbmX, libpgmX, libppmX, libpamX packages -- IIRC the netpbm 
maintainer(s) follow different sequences on backwards compatibility on 
the libraries.  There's no need to bump the "so" number and force new 
downloads of cygpbmX.dll, cygpgmX.dll, and cygpamX.dll, if only 
cygppmX.dll had a backwards-incompatible change...


Charles Wilson wrote:

> Wonderful, please do.
> BTW, I have had a private version of netpbm, packaged in a 
> 'setup-compatible' way, for some time now.  When I get home, I'll put my 
> version somewhere that you can access; you may want to expropriate some 
> of my patches...
> Also, which png have you linked against?  1.0.12, or 1.0.13?  (Also, I 
> have libpng-1.2.2 ready for upload to sourceware, but I'm waiting for 
> the ripples from the massive 1.0.13 packaging changes to settle out...)

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