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compiling 3.7.0 from source with custom libffi path

On 9/24/18, Thomas Jollans <tjol at tjol.eu> wrote:
> On 2018-09-24 14:14, Fetchinson . via Python-list wrote:
>>>> I'm trying to compile python 3.7.0 from source with a custom libffi
>>>> path and the compiler/linker doesn't seem to pick up the right
>>>> version. The system libffi doesn't have the development files so I've
>>>> installed the latest libffi (also from source) to /opt/custom but
>>>> still I get
>>>> INFO: Could not locate ffi libs and/or headers
>>> Apparently the configure script uses pkg-config to locate libffi.[1] You
>>> should be able to get it to find your libffi by setting PKG_CONFIG_PATH
>>> appropriately (probably to "/opt/custom/lib/pkgconfig" ?)
>>> [1]: https://github.com/python/cpython/blob/v3.7.0/configure.ac#L2936
>> Thanks, tried it, but still no luck, exact same error message.
> Is there a .pc file for libffi? Can you run pkg-config manually, to
> check if it works, and finds libffi in your environment?

Yes, there is a .pc for libffi and if I first

export PKG_CONFIG_PATH=/opt/custom

then pkg-config finds the necessary include path:

[fetch at fetch]$ pkg-config libffi --cflags-only-I

And of course this path is correct:

[fetch at fetch]$ ls /opt/custom/lib/libffi-3.2.1/include
ffi.h  ffitarget.h

And also the configure script correctly creates the Makefile:

[fetch at fetch]$ grep LIBFFI_INCLUDE Makefile
LIBFFI_INCLUDEDIR=      /opt/custom/lib/libffi-3.2.1/include

So I'd say everything should work but it doesn't, I reran ./configure
and also make of course.


>> Cheers,
>> Daniel
>>>> Failed to build these modules:
>>>> _ctypes
>>>> Although I compile python with --prefix=/opt/custom because that's the
>>>> location I'd like to install it too. So how do I tell the build system
>>>> where to find my custom libffi?
>>>> Cheers,
>>>> Daniel
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