[MacPorts] #32260: libpixman: libpng14.dylib, file was built for unsupported file format which is not the architecture being linked

[MacPorts]

#32260: libpixman: libpng14.dylib, file was built for unsupported file format which
is not the architecture being linked
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  Reporter:  brian@…             |       Owner:  ryandesign@…           
      Type:  defect              |      Status:  new                    
  Priority:  Normal              |   Milestone:                         
 Component:  ports               |     Version:  2.0.3                  
Resolution:                      |    Keywords:                         
      Port:  libpixman           |  
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Changes (by ryandesign@…):

 * cc: jeremyhu@… (added)


Comment:

 Replying to [comment:4 schwern@…]:
 > Upon further investigation it appears that libpng is an optional
 dependency of libpixman.  libpixman itself will try to use it if it is
 installed, detected by autoconf.  This is a problem as Macports doesn't
 appear to have a way to declare an optional dependency.  This bug breaks
 automated +universal installs of any of libpixman's dependents

 Only if you don't already have libpng installed universal.

 libpixman appears to use libpng to do some tests at build time, but does
 not need libpng at runtime time. A developer of libpixman confirmed
 libpixman will not behave any better at runtime if libpng is there:

 {{{
 On Feb 13, 2012, at 14:36, Søren Sandmann wrote:

 > libpng is only used in the test and demo
 > programs and doesn't improve pixman itself.
 }}}

 So I would prefer not to add a libpng dependency.

 > Finally, the libpixman portfile could pass in an option to configure to
 disable PNG support if it detects an unsuitable libpng install.  This
 would probably require patching configure.  Again, I must wave my hands.

 Jeremy Huddleston implemented such a configure option, and sent a patch to
 me and the aforementioned libpixman developer by private email. The
 developer requested that the discussion be moved to the pixman mailing
 list, but I don't think that happened; I cannot find a discussion about
 this in the [http://lists.freedesktop.org/archives/pixman/ pixman mailing
 list archives] in February or March.

-- 
Ticket URL: <https://trac.macports.org/ticket/32260#comment:7>
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