[MacPorts] #69546: py312-matplotlib fails to install on eMac with Leopard 10.5.8 - all dependencies installed.

[MacPorts]

#69546: py312-matplotlib fails to install on eMac with Leopard 10.5.8 - all
dependencies installed.
----------------------------+------------------------
  Reporter:  ilovecrts      |      Owner:  reneeotten
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.9.1
Resolution:  fixed          |   Keywords:
      Port:  py-matplotlib  |
----------------------------+------------------------

Comment (by kencu):

 So to workaround the libstdc++.dylib issue, we need to do this:

 {{{
 LeopardG5:~$ export DYLD_LIBRARY_PATH=/opt/local/lib/libgcc
 LeopardG5:~$ python3
 Python 3.12.2 (main, Feb 22 2024, 16:48:13) [GCC 7.5.0] on darwin
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import matplotlib.pyplot as plt
 }}}


 setting {{{DYLD_LIBRARY_PATH=/opt/local/lib/libgcc}}} in the environment
 before you start running anything tells the library locating software in
 MacOSX to first look in {{{/opt/local/lib/libgcc}}} for any libraries it
 is trying to load.

 Those libraries are our new ones (which we need for the newer compiler).
 The old software that has been built against
 {{{/usr/lib/libstdc++.6.dylib}}} on your system seems to be quite happy
 using that newer libstdc++.6.dylib, and so there is no confusion about the
 objects that will be created and passed back and forth.

 I will say that even though setting {{{$ export
 DYLD_LIBRARY_PATH=/opt/local/lib/libgcc}}} fixes the loading problem,
 other errors do show up soon after with other things.

 I know very little about matplotlib, and only slightly more about python,
 so for those issues, you might open a new ticket with that specific error
 and perhaps someone who does know about those things will catch an
 interest and help you out with that.

 Now -- will everyone who uses matplotlib on 10.5 PPC need to set {{{export
 DYLD_LIBRARY_PATH=/opt/local/lib/libgcc}}}? Or is there some way to
 automate that? -- I can't see an easy way to automate that just now -- I
 think you're stuck exporting it whenever you want to use matplotlib, at
 the moment.

-- 
Ticket URL: <https://trac.macports.org/ticket/69546#comment:18>
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