#11696: The libpng12 spkg should also create symbolic links from `libpng.*` for
its
libraries
-----------------------------------------------------+----------------------
Reporter: leif | Owner: leif
Type: defect | Status:
needs_work
Priority: major | Milestone: sage-5.8
Component: packages | Resolution:
Keywords: PNG libpng spkg | Work issues:
Report Upstream: N/A | Reviewers: Dmitrii
Pasechnik
Authors: Leif Leonhardy, Jean-Pierre Flori | Merged in:
Dependencies: | Stopgaps:
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Comment (by jpflori):
Replying to [comment:36 dimpase]:
> This results in the name clash we see on OSX. I suppose you can tweak
the spkg to remove all the {{{libpng.*}}}, they are apparently not
needed.
> (This of course defeats part of the purpose of this ticket :-)).
Exactly, and the solution to delete files is somehow "dirty"...
In particular if a package looks for a png rather than png12 it will fail,
which may be considered bad.
Or good as the problem with R mentioned here shows... if R finds png then
it somehow triggers the use of the evil ImageIO which wants a symbol
prefixed png, but its our non prefixed version which is loaded.
Here are two different preliminary plans to get this merged.
First one:
* delete libpng.* from $SAGE_LOCAL/lib on Darwin
and potentially (although quite unrelated):
* include the fix from John from
http://sage.math.washington.edu/home/leif/Sage/spkgs/matplotlib-1.0.1.p1.spkg
to fix the problem described here http://groups.google.com/group/sage-
release/msg/ab91298b636b947a caused by broken pkg-config (needs to be
rebased on top of #11915).
or for this second point:
* modify the changes introduced in #11686 to matplotlib so that it only
directly links to png12 rather than png when pkg-config is not installed
and not unconditionally, because I feel it was not really needed (the real
problem was that some pc file got broken, that should be now fixed in
#11760) but kept because it was cleaner that way, i.e. only patch when
needed, although http://groups.google.com/group/sage-
release/msg/ab91298b636b947a showed it might be beneficial in other
situations.
Or second one:
* do not delete libpng.* from $SAGE_LOCAL/lib
and:
* use sage-native-execute to run hg
* find a similar workaround for R and other things which magically trigger
the use of ImageIO on Darwin
and potentially:
* get rid of all fixes/hacks which make packages link directly to png12
rather than png as this won't be needed anymore.
The first solution looks infinitely more realistic and simpler, so I'll
craft something based on that.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11696#comment:37>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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