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Message-ID: <3A7DFCAC.6F846E99@Wanadoo.fr>
Date: Mon, 05 Feb 2001 02:06:52 +0100
From: Jerome BENOIT <JGMBenoit AT Wanadoo DOT fr>
MIME-Version: 1.0
To: cygwin AT sources DOT redhat DOT com
Subject: Re: [ANNOUNCEMENT] Updated: libpng-1.0.9-3
References: <200102042131 DOT f14LVNr13796 AT rtl DOT cygnus DOT com>
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Bonjour:

When I launch one of my EXE build with the previous version I get
an "Error Starting Program" window with the message:

The X.EXE file is linkeked to missing export CYGPNG2.DLL:png_init_io


I hope it helps,
Jerome BENOIT

"Charles S. Wilson" wrote:
> 
> The libpng package has been updated to version 1.0.9-3.  libpng is a
> library that provides routines to access and manipulate Portable Network
> Graphics (PNG) images.  PNG is a lossless, patent-unencumbered image
> format intended to replace GIF.
> 
> Since the png-developers group released version 1.0.9 and our previous
> cygwin version was based on 1.0.8, I updated our package.  This is
> cygwin release 1.0.9-3 because 1.0.9-1 and 1.0.9-2 were internal
> versions based on the 1.0.9 release candidates from the png-developers
> group.
> 
> CHANGES:
> 
> - many bugfixes from the png-developers group between 1.0.8 and 1.0.9.
> 
> - supports the '-DALL_STATIC' compile-time flag as a synonym for
> -DPNG_STATIC (and ZLIB_STATIC).  This should help make it easier to
> compile statically a project with many dependencies.  However, this is a
> long-term project: each 'dll-ized' library must be updated before
> '-DALL_STATIC' is useful.  Don't hold your breath.  So far, the
> following libraries support -DALL_STATIC:
>   zlib-1.1.3-6
>   libpng-1.0.9-3
>   ncurses-5.2-4
> 
> INSTALLATION:
> 
> To update your installation, click on the "Install Cygwin now" link on
> the http://sources.redhat.com/cygwin web page.  This downloads setup.exe
> to your system.
> 
> Run setup and answer all of the questions.  PLEASE, PLEASE, PLEASE
> choose a mirror site for your download.  The 'sources.redhat.com' site
> is badly overloaded.  The mirrors below have the latest version of this
> package:
> 
> ftp://ftp.geekgadgets.org/pub/mirrors/cygwin/ (US)
> ftp://ftp.franken.de/pub/win32/develop/gnuwin32/cygwin/mirrors/cygnus/
> (Germany)
> ftp://ftp.ntua.gr/pub/pc/cygwin/ (Greece)
> 
> The setup.exe program will figure out what needs to be updated on your
> system and should install the libpng package automatically.
> 
> If you have questions or comments, please send them to the Cygwin
> mailing list at:  cygwin AT sources DOT redhat DOT com .  I would appreciate if you
> would use this mailing list rather than emailing me directly. This
> includes ideas and comments about the setup utility or Cygwin general.
> 
> If you want to make a point or ask a question the Cygwin mailing list is
> the appropriate place.
> 
>               *** CYGWIN-ANNOUNCE UNSUBSCRIBE INFO ***
> 
> If you want to unsubscribe to the cygwin-announce mailing list, look at
> the "List-Unsubscribe: " tag in the email header of this message. Send
> email to the address specified there.  It will be in the format:
> 
> cygwin-announce-unsubscribe-you=yourdomain DOT com AT sources DOT redhat DOT com
> 
> NOTES:
> 
> o Building the package from source requires gcc-2.95.2-7 and
> binutils-20001221-1 or later (the -mno-win32 flag was inverted
> to -mwin32 at that release)
> 
> o depends on zlib-1.1.3-6, so you should also update zlib to that
> version.
> 
> o If you are building a package that depends on libpng, and you wish to
> link *statically*, define -DPNG_STATIC *and* -DZLIB_STATIC (or just
> define -DALL_STATIC) to get the 'correct' #define's in png.h/pngconf.h
> *and* zlib.h/zconf.h when compiling the .o files in your package. Also,
> use 'gcc -static' when linking your package.
> 
> o No special -Ddefine options or link options are needed when building a
> package that depends on libpng and you want to link dynamically
> (recommended).
> 
> o I was able to successfully compile and pass libpng's internal tests
> ('make test') with all of the following build enviromenments:
>   - static
>   - dll
>   - static with pnggccrd (assembler optimizations)
>   - dll with pnggccrd
>   - static (compiled with 'gcc -mwin32')
>   - dll (+ 'gcc -mwin32')
>   - static with pnggccrd (+ 'gcc -mnin32')
>   - dll with pnggccrd (+ 'gcc -mwin32')
> However, the binary package did not use any of the assembler code, and I
> didn't use 'gcc -mwin32' to compile it. According to tests reported
> on the libpng-developer's mailing list, the pnggccrd code did not speed
> it up all that much, and it breaks cygwin's compatibility with older
> processors (a no-no). If you want to build your own libpng with those
> enhancements, download the source -- /usr/doc/Cygwin/libpng-1.0.9.README
> contains instructions for building your own asm-accelerated libpng.
> 
> Charles Wilson
> libpng volunteer maintainer for cygwin
> 
> --
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