building 3.7.1 from source, _ctypes and libffi troubles

[Fetchinson .]

On 12/20/18, Fetchinson . <fetchinson at googlemail.com> wrote:
> Hi all, I'm trying to build 3.7.1 from source and having trouble with
> libffi and _ctypes. I'm on linux and have installed libffi also from
> source to a custom location:
>
> $HOME/opt/lib64/libffi.so.6.0.4
> $HOME/opt/lib64/libffi.a
> $HOME/opt/lib64/libffi.la
> $HOME/opt/lib64/libffi.so.6
> $HOME/opt/lib64/libffi.so
> $HOME/opt/lib/pkgconfig/libffi.pc
> $HOME/opt/lib/libffi-3.2.1/include/ffi.h
> $HOME/opt/lib/libffi-3.2.1/include/ffitarget.h
> $HOME/opt/share/info/libffi.info
>
> I have no idea why the installation is somewhat scattered, these are
> the default locations that were created by
>
> ./configure --prefix=$HOME/opt
>
> of the source libffi.
>
> In any case, just to be sure, I've copied the header files to
>
> $HOME/opt/include/ffi.h
> $HOME/opt/include/ffitarget.h
>
> Looks like pkg-config works as intended:
>
> [fetch at fetch opt]$ pkg-config --libs libffi
> -L/home/fetch/opt/lib/../lib64 -lffi
>
> [fetch at fetch opt]$ pkg-config --cflags libffi
> -I/home/fetch/opt/lib/libffi-3.2.1/include
>
> And as far as I know pkg-config is used by python's configure script
> so everything should be fine. I also set
> LD_LIBRARY_PATH=/home/fetch/opt/lib:/home/fetch/opt/lib64 and also
> C_INCLUDE_PATH=/home/fetch/opt/include
>
> And still I get
>
> Failed to build these modules:
> _ctypes
>
> from make when I try to build python 3.7.1 Also tried adding
> --with-system-ffi to ./configure but that didn't help either.
>
> Does anyone have an idea what's wrong? I've seen some related bug reports,
> e.g.
>
> https://bugs.python.org/issue35170
>
> but these were typically solved by the OP installing libffi from the
> repository of his/her distro. Note that in my case I must compile
> libffi from source.
>
> Any ideas?
>
> Thanks a lot,
> Daniel

I just found a bug report from the end of September detailing the
exact same problem:

https://bugs.python.org/issue34823

It's still open with no comments at all :(

Is there a chance this will be fixed?

Summarizing: the problem is that python can't be build on linux from
source if libffi is installed to non-standard directories.

Cheers,
Daniel


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