New issue 2660: SHLIB_SUFFIX appears to be incorrect
https://bitbucket.org/pypy/pypy/issues/2660/shlib_suffix-appears-to-be-incorrect
eevee:
At least on my system, `sysconfig.get_config_var('SHLIB_SUFFIX')` returns
`.pypy3-58-x86_64-linux-gnu.so`, the same as `EXT_SUFFIX`. But CPython returns
`.so`.
By the looks of [Python issue 16754](https://bugs.python.org/issue16754), the
entire point of having `SHLIB_SUFFIX` vs `EXT_SUFFIX` is so `SHLIB_SUFFIX` can
be the plain suffix used for finding system libraries, and `EXT_SUFFIX` can be
used for Python extension modules.
I ran into this trying to install Pillow, which looks for some libraries via
distutils's `find_library_file`, which relies on
`Compiler.shared_lib_extension`, which is set by
`distutils.sysconfig_pypy.customize_compiler` to be `SHLIB_SUFFIX`.
I'm actually not sure how anyone is successfully building against shared
libraries on Linux at the moment; maybe this only affects me, for some bizarre
reason. Changing it to `.so` in both `distutils/sysconfig_pypy.py` and
`_sysconfigdata.py` allowed Pillow to install successfully.
Arch Linux x64, using Arch's PyPy3 package:
```
Python 3.5.3 (a37ecfe5f142bc971a86d17305cc5d1d70abec64, Jun 12 2017, 16:41:39)
[PyPy 5.8.0-beta0 with GCC 7.1.1 20170528]
```
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