[MacPorts] #37256: gobject-introspection: building non-universal i386 fails when python27 is installed universal i386 x86_64

[MacPorts]

#37256: gobject-introspection: building non-universal i386 fails when python27 is
installed universal i386 x86_64
--------------------------+-----------------------------------
 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Low           |  Milestone:
Component:  ports         |    Version:  2.1.2
 Keywords:                |       Port:  gobject-introspection
--------------------------+-----------------------------------
 This one's interesting. Installing gobject-introspection without the
 universal variant fails when build_arch is i386 (i.e. on Leopard,
 presumably on Tiger too) on a 64-bit Mac if python27 is already installed
 universal for i386 and x86_64. (I changed my universal_archs to this in
 macports.conf.) The error message is:

 {{{
 Traceback (most recent call last):
   File "./g-ir-scanner", line 44, in <module>
     from giscanner.scannermain import scanner_main
   File "./giscanner/scannermain.py", line 34, in <module>
     from giscanner.dumper import compile_introspection_binary
   File "./giscanner/dumper.py", line 28, in <module>
     from .gdumpparser import IntrospectionBinary
   File "./giscanner/gdumpparser.py", line 31, in <module>
     from .transformer import TransformerException
   File "./giscanner/transformer.py", line 27, in <module>
     from .girparser import GIRParser
   File "./giscanner/girparser.py", line 26, in <module>
     from .girwriter import COMPATIBLE_GIR_VERSION
   File "./giscanner/girwriter.py", line 25, in <module>
     from .xmlwriter import XMLWriter
   File "./giscanner/xmlwriter.py", line 74, in <module>
     from _giscanner import collect_attributes
   File "./giscanner/libtoolimporter.py", line 66, in load_module
     mod = imp.load_module(name, open(realpath), realpath, (extension,
 'rb', 3))
 ImportError: dlopen(./.libs/_giscanner.so, 2): no suitable image found.
 Did find:
         ./.libs/_giscanner.so: mach-o, but wrong architecture
 make[2]: *** [GLib-2.0.gir] Error 1
 }}}

 The problem is that 64-bit is considered better than 32-bit so python27
 runs 64-bit, then is surprised when it cannot find a 64-bit _giscanner.so.
 The workaround I used was to install gobject-introspection universal as
 well.

 Perhaps it's an esoteric case, since most users aren't on Leopard anymore
 and most of those that are haven't changed their universal_archs, but I
 wanted to at least document the problem and the workaround.

-- 
Ticket URL: <https://trac.macports.org/ticket/37256>
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