On May 7, 7:45 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> On 5/6/07, cwitty <[EMAIL PROTECTED]> wrote:
>
>
>
> > > I've posted sage-2.5.alpha3 here:
>
> > > http://sage.math.washington.edu/home/was/sage2.5/
>
> > > Feedback is welcome.
>
> > On my machine running Debian testing, plotting-related tests fail with
> > messages like:
>
> > libpng error: Incompatible libpng version in application and library
>
> > A mysterious error (perphaps a memory error?) occured, which may have
> > crashed doctest.
>
> > I think I understand why this is happening. Debian testing includes a
> > new version of libpng (version 1.4, package names libpng14-1 and
> > libpng14-dev). When matplotlib is compiled (in particular, the file
> > _ns_image.cpp, which produces _ns_image.so), it uses a -I flag to
> > include the png.h header file from SAGE's local version of libpng
> > (version 1.2.16). However, when the resulting object file is linked,
> > to actually produce _ns_image.so, it has no special -L flags, so it
> > ends up linked against Debian's version 1.4 libpng. At runtime,
> > libpng 1.4 notices that the application was compiled against the
> > version 1.2.16 png.h header file; this is a fatal error, and exits
> > SAGE.
>
> > The fix is to change the matplotlib spkg-install, so that the
> > _ns_image.so link command has the right -L flag to link against SAGE's
> > libpng. (I don't know enough about the Python compile system to do
> > this myself.)
>
> Many thanks for tracking this down!! I greatly appreciate
> it.
>
> -- William
This will probably solve this issue I reported above on cygwin, too:
- _ns_image.dll issues:
E:\cygwin\sage-2.5.alpha2\local\bin\python.exe: *** fatal error -
unable to remap E:\cygwin\sage-2.5.alpha2\local\lib\python2.5\site-
packages\matplotlib\_ns_image.dll to same address as
parent(0x1B0D0000) != 0x1B310000 15
[main] python 1588 fork: child 1704 - died waiting for dll loading,
errno 11
Cheers,
Michael
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