Hi, 2014-12-28 17:17 GMT+01:00 David Cournapeau <[email protected]>:
> > > On Sun, Dec 28, 2014 at 1:59 AM, Matthew Brett <[email protected]> > 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. > > This is correct and the usual recommendation. In the case of libnpymath.a a mingw-w64 build static library may work, if all external symbol names are corrected to the MSVC standard. This could be accomplished with the help of objconv and should be tested IMHO. Carl > 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 >> _______________________________________________ >> NumPy-Discussion mailing list >> [email protected] >> http://mail.scipy.org/mailman/listinfo/numpy-discussion >> > > > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion > >
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