[issue34823] libffi detection doesn’t work in my setup

[Daniel Fetchinson]

Daniel Fetchinson  added the comment:

It would be really great if this could be sorted out because at the moment this 
bug prevents me from using numpy/scipy with python 3.7.1 (they need _ctypes).

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[issue34823] libffi detection doesn’t work in my setup

[Daniel Fetchinson]

Daniel Fetchinson  added the comment:

I have the exact same issue, trying to compile 3.7.1 with a custom libffi 
location. Note that I must build libffi from source and can't install binaries 
provided by my distro, I believe this is the origin of the problem. Probably 
the python build system checks for libffi in some "standard" locations and it 
doesn't seem possible to use libffi from a custom location.

This is where libffi gets installed after passing --prefix=$HOME/opt to 
./configure:


$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

In any case, just to be sure, I've copied the header files to

$HOME/opt/include/ffi.h
$HOME/opt/include/ffitarget.h

And pkg-config works:

[fetch@fetch opt]$ pkg-config --libs libffi
-L/home/fetch/opt/lib/../lib64 -lffi

[fetch@fetch opt]$ pkg-config --cflags libffi
-I/home/fetch/opt/lib/libffi-3.2.1/include

These environment variables are also set:

LD_LIBRARY_PATH=/home/fetch/opt/lib:/home/fetch/opt/lib64

C_INCLUDE_PATH=/home/fetch/opt/include

And still _ctypes fails to build (but python itself (minus _ctypes) compiles 
successful and works perfectly well).

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nosy: +fetchinson

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[issue34823] libffi detection doesn’t work in my setup

[Daniel Fetchinson]

Daniel Fetchinson  added the comment:

It seems there is a way to fix this:

https://mail.python.org/pipermail/python-list/2018-December/738568.html

LDFLAGS=`pkg-config --libs-only-L libffi` ./configure

Would be nice to document this or make the build system find the libraries and 
headers in a simpler way.

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