[Numpy-discussion] npymath on Windows

David Cournapeau cournape at gmail.com
Sun Dec 28 11:17:45 EST 2014


On Sun, Dec 28, 2014 at 1:59 AM, Matthew Brett <matthew.brett at gmail.com>
wrote:

> Hi,
>
> Sorry for this ignorant email, but we got confused trying to use
> 'libnpymath.a' from the mingw builds of numpy:
>
> We were trying to link against the mingw numpy 'libnpymath.a' using
> Visual Studio C, but this give undefined symbols from 'libnpymath.a'
> like this:
>

This is not really supported. You should avoid mixing compilers when
building C extensions using numpy C API. Either all mingw, or all MSVC.

David


>
> npymath.lib(npy_math.o) : error LNK2019: unresolved external symbol
> _atanf referenced in function _npy_atanf
> npymath.lib(npy_math.o) : error LNK2019: unresolved external symbol
> _acosf referenced in function _npy_acosf
> npymath.lib(npy_math.o) : error LNK2019: unresolved external symbol
> _asinf referenced in function _npy_asinf
>
> (see :
> http://nipy.bic.berkeley.edu/builders/dipy-bdist32-33/builds/73/steps/shell_6/logs/stdio
> )
>
> npymath.lib from Christophe Gohlke's (MSVC compiled) numpies does not
> give such an error.  Sure enough, 'npymath.lib' shows these lines from
> `dumpbin /all npymath.lib`:
>
>   00000281  REL32                      00000000        4F  asinf
>   00000291  REL32                      00000000        51  acosf
>   000002A1  REL32                      00000000        53  atanf
>
> whereas `dumpbin /all libnpymath.a` shows these kinds of lines:
>
>  000008E5  REL32                      00000000        86  _asinf
>  000008F5  REL32                      00000000        85  _acosf
>  00000905  REL32                      00000000        84  _atanf
>
> As far as I can see, 'acosf' is defined in the msvc runtime library.
> I guess that '_acosf' is defined in some mingw runtime library?   Is
> there any way of making a npymath library that will pick up the msvc
> math and so may work with both msvc and mingw?
>
> Sorry again if that's a dumb question,
>
> Matthew
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