[Distutils] Correct way to allow C extension building to fail?

[Andrew Straw]

I'm not sure if this will work, but it might:

class NotPlatformDependentDistribution(Distribution):
    # Force platform-independent build.
    def has_ext_modules(self):
        return False

setup(
      distclass = NotPlatformDependentDistribution,
      )


Andreas Klöckner wrote:
> Hi there,
> 
> I'm working on a Python module (simplejson) that comes with a C extension that 
> can optionally speed up some of its operations. It is however ok for this 
> extension to fail to build, in which case the module will use Python 
> fallbacks.
> 
> How can I allow for this failure? Bob Ippolito, the original author, has this 
> implemented as follows:
> 
> 8< ------------------------------------------------------
> class ve_build_ext(build_ext):
>     # This class allows C extension building to fail.
> 
>     def run(self):
>         try:
>             build_ext.run(self)
>         except DistutilsPlatformError, x:
>             self._unavailable(x)
> 
>     def build_extension(self, ext):
>         try:
>             build_ext.build_extension(self, ext)
>         except (CCompilerError, DistutilsExecError), x:
>            self._unavailable(x)
> 
>     def _unavailable(self, exc):
>          print '*'*70
>          print BUILD_EXT_WARNING
>          print exc
>          print '*'*70
> 
> ...
> 
>    setup(cmdclass={'build_ext': ve_build_ext},)
> 8< ------------------------------------------------------
> 
> On current setuptools, this fails with
> 
> ** error: Setup script exited with error: can't 
> copy 'simplejson.egg-info\native_libs.txt': doesn't exist or not a regular 
> file
> 
> How can I fix this?
> 
> Andreas
> 
> 
> ------------------------------------------------------------------------
> 
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