[issue15182] find_library_file() should try to link

[Steve Dower]

Steve Dower  added the comment:

Distutils is now deprecated (see PEP 632) and all tagged issues are being 
closed. From now until removal, only release blocking issues will be considered 
for distutils.

If this issue does not relate to distutils, please remove the component and 
reopen it. If you believe it still requires a fix, most likely the issue should 
be re-reported at https://github.com/pypa/setuptools

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nosy: +steve.dower
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue15182] find_library_file() should try to link

[Jeroen Demeyer]

Jeroen Demeyer added the comment:

Sorry for the late answer, but yes: I found this out using an actual 
compilation.  I must admit it was in a bit of an usual situation (32-bit 
userspace on a mixed 32/64-bit mutilib installation), but most other software 
packages have no problems configuring correctly in such a situation.

I can imagine that it's not a trivial change and would require some redesign.

Some more context: this was discovered when building Python as part of Sage, 
see http://trac.sagemath.org/sage_trac/ticket/12725 for the downstream bug 
report.

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[issue15182] find_library_file() should try to link

[Éric Araujo]

Éric Araujo mer...@netwok.org added the comment:

Hi Jeroen, thanks for the report.  Did you run into this while building a 
distribution or did you find it just reading the code?  Distutils is in a 
special state where we only fix bugs but don’t do any improvement for the sake 
of improvements, because many setup.py scripts rely on undocumented details.

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[issue15182] find_library_file() should try to link

[Jeroen Demeyer]

New submission from Jeroen Demeyer jdeme...@cage.ugent.be:

The find_library_function() in Lib/distutils/unixccompiler.py does a very 
simple-minded check to determine the existence of a library. It basically only 
checks that a certain .so file exists. This may lead to false positives: the 
mere existence of a .so file does not imply that we can actually link against 
that library.

In addition to (or even better: instead of) checking the existence of the file, 
you should try to (in the spirit of autoconf) compile a simple program using 
$CC -l$LIB prog.c -o prog

One particular instance of where things can go wrong is with a 32-bit/64-bit 
multilib installation. Python might find a 64-bit library in /usr/lib when 
we're actually compiling 32-bit with libraries in /usr/lib32.

--
assignee: eric.araujo
components: Distutils
messages: 163968
nosy: eric.araujo, jdemeyer, tarek
priority: normal
severity: normal
status: open
title: find_library_file() should try to link
type: compile error
versions: Python 2.7

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