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Re: PATCH: configure.in fixes; minor doc fix; bug report

From: Irene VATTON <Irene.Vatton@inrialpes.fr>
Date: Mon, 15 Jan 2001 12:07:56 +0100
Message-Id: <200101151107.MAA15664@tahiti.inrialpes.fr>
To: Peter Moulder <pmoulder@csse.monash.edu.au>
cc: www-amaya-dev@w3.org

Hi Peter,

Thanks for the report and patches. I integrated them in the CVS base.

> Note: after applying this patch, a couple of existing problems are
> highlighted:
>   i) libjpeg and libpng are built even when external libjpeg and/or
>      libpng are to be used.

Fixed, but you have to explicitly set --without-included-jpeg because the 
is --with-included-jpeg

>   ii) `-I../../libpng -I../../libpng/zlib' is being used even when
>       external libpng and zlib are to be used.


>       Comments in configure.in suggest that this is because Amaya is
>       using a modified png header file, but there's no note as to which
>       header file is modified or why.  Using a header file of one
>       version and linking against a library of another version is asking
>       for trouble (and indeed may have contributed to item iii in this
>       list).
>       I couldn't find version 1.0.1 of libpng to do a diff against,
>       but comparing with 1.0.2, my best guess is that the one and only
>       change is to make it not be a compile error to have already
>       #include'd setjmp.h before #include'ing pngconf.h.  Judging by
>       the comment added by the Debian maintainer to pngconf.h, it
>       would appear that the change wasn't even desirable in the first
>       place:

This is related to your point iii). The last library png (1.08 I guess)
is not compatible and Amaya crashes.

> 	#    ifdef _SETJMP_H
> 	/* Explanation added by debian maintainer Philippe Troin <phil@fifi.org>.
> 	   There are two versions of setjmp, depending wether or not we compile for
> 	   BSD. They are incompatible and can cause crashes. The PNG people force
> 	   here a unique behavior for setjmp. It you get the error below,
> 	   then include <png.h> before <setjmp.h>.
> 	*/
> 	#error png.h already includes setjmp.h with some additional fixup.
> 	#    endif
>   iii) png_read_init bombs out in current libpng (unless libpng was
>        compiled with PNG_LEGACY_SUPPORTED; see pngread.c in current
>        libpng distribution).

Nabil Layaida is looking at a possible update of the Amaya code for working
with a more recent version of the library png. Meanwhile it's preferable
to work with the provided version of that library.

> Given problems ii and iii above, you might want to make the png test
> pattern be `1\.0\.1' instead of `1\.0\..*'.  (I don't know what the upper
> limit for problems is; maybe make it `1\.0\.[1-7]' and reduce the range
> when people report errors.)
> pjm.

Received on Monday, 15 January 2001 06:08:04 UTC

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