Databases
StackOverflow2013
Postsdbo
POHow can I build my C extensions with MinGW-w64 in Python?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow can I build my C extensions with MinGW-w64 in Python?
    primarykey
    data
    text
    <p>So I have a few Python C extensions I have previously built for and used in 32 bit Python running in Win7. I have now however switched to 64 bit Python, and I am having issues building the C extension with MinGW-w64.</p> <p>I made the changes to distutils as per <a href="http://bugs.python.org/issue11723">this post</a>, but I am getting some weird errors suggesting something is wrong:</p> <pre><code>$ python setup.py build running build running build_ext building 'MyLib' extension c:\MinGW64\bin\x86_64-w64-mingw32-gcc.exe -mdll -O -Wall -Ic:\Python27\lib\site-packages\numpy\core\include -Ic:\Python27\include -Ic:\Python27\PC -c MyLib.c -o build\temp.win-amd64-2.7\Release\mylib.o MyLib.c: In function 'initMyLib': MyLib.c:631:5: warning: implicit declaration of function 'Py_InitModule4_64' [-Wimplicit-function-declaration] writing build\temp.win-amd64-2.7\Release\MyLib.def c:\MinGW64\bin\x86_64-w64-mingw32-gcc.exe -shared -s build\temp.win-amd64-2.7\Release\mylib.o build\temp.win-amd64-2.7\Release\MyLib.def -Lc:\Python27\libs -Lc:\Python27\PCbuild\amd64 -lpython27 -o build\lib.win-amd64-2.7\MyLib.pyd build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x13d): undefined reference to `__imp_PyExc_ValueError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1275): undefined reference to `__imp_PyExc_ValueError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1eef): undefined reference to `__imp_PyExc_ImportError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1f38): undefined reference to `__imp_PyExc_AttributeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1f4d): undefined reference to `__imp_PyCObject_Type' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1f61): undefined reference to `__imp_PyExc_RuntimeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1fc7): undefined reference to `__imp_PyExc_RuntimeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x1ffe): undefined reference to `__imp_PyExc_RuntimeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x2042): undefined reference to `__imp_PyExc_RuntimeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x206c): undefined reference to `__imp_PyExc_RuntimeError' build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x208a): more undefined references to `__imp_PyExc_RuntimeError' follow build\temp.win-amd64-2.7\Release\mylib.o:MyLib.c:(.text+0x20a7): undefined reference to `__imp_PyExc_ImportError' collect2.exe: error: ld returned 1 exit status error: command 'x86_64-w64-mingw32-gcc' failed with exit status 1 </code></pre> <p>I have googled around quite a bit to find information, but it's not easy to find a definite answer. Could someone shed some light on this? What further changes should I do to be able to successfully build C extensions for 64 bit Python in Win7?</p> <p>EDIT:</p> <p>After some helpful pointers in cgohlke's comments below I managed to generate <code>libpython27.a</code>. However after following the advice on <a href="https://groups.google.com/forum/?fromgroups#!topic/cython-users/r_0A5AHwiak">this post</a> (2nd to last) I still had a the <code>__imp_Py_InitModule4_64</code> error. After some serious Google-fu I managed to trip over <a href="http://deeplearning.net/software/theano/_sources/install.txt">this post</a> telling me to rename the <code>Py_InitModule4</code> line to <code>Py_InitModule4_64</code>. After that everything worked swimmingly.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USc00kiemonster
    1. USc00kiemonster
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COYou need to create `libpython27.a` with `gendef.exe python27.dll` and `dlltool.exe --dllname python27.dll --def python27.def --output-lib libpython27.a` and place it in `C:\Python27\libs`
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. UScgohlke
    2. COI saw some posts mentioning gendef. But it's not easy finding information on how to go about generation the libpython27.a file. Would you happen to know of any?
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. USc00kiemonster
    3. COOh ok, gendef and dlltool are two different commands. Will try. Thanks.
      singulars
      1. POHow can I build my C extensions with MinGW-w64 in Python?
      1. USc00kiemonster
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload