Author erik.bray
Recipients erik.bray
Date 2018-07-24.17:10:52
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Message-id <1532452252.87.0.56676864532.issue34212@psf.upfronthosting.co.za>
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Since issue30860, libpython is no longer able to be linked as a shared library, because built-in modules are not compiled with the correct external linkage flags.

This is due to the removal of -DPy_BUILD_CORE, which in pyport.h is used to control wither __declspec(dllexport) is used as opposed to __declspec(dllimport).

Fortunately Eric Snow already added in https://github.com/python/cpython/pull/3458 a new flag Py_BUILD_CORE_BUILTIN which is used sparingly on Windows, and which should also be used, e.g. on Cygwin or MinGW, when compiling modules that are linked into libpython as built-ins.  It sets the right external linkage flags without carrying the additional weight of Py_BUILD_CORE.

This along with issue34211 need to be fixed in order to get Python 3.7+ building on Cygwin again.
History
Date User Action Args
2018-07-24 17:10:52erik.braysetrecipients: + erik.bray
2018-07-24 17:10:52erik.braysetmessageid: <1532452252.87.0.56676864532.issue34212@psf.upfronthosting.co.za>
2018-07-24 17:10:52erik.braylinkissue34212 messages
2018-07-24 17:10:52erik.braycreate