[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[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 out of date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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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[Mark Lawrence]

Change by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[Roumen Petrov]

Changes by Roumen Petrov bugtr...@roumenpetrov.info:


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nosy: +rpetrov

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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[Mark Lawrence]

Mark Lawrence added the comment:

Who is best placed to comment on build issues?

--
nosy: +BreamoreBoy
versions: +Python 3.4, Python 3.5 -Python 2.6, Python 3.1, Python 3.2

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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[koobs]

Changes by koobs koobs.free...@gmail.com:


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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[Marcus von Appen]

New submission from Marcus von Appen m...@sysfault.org:

If CPython is built and installed with additional CPPFLAGS and/or LDFLAGS on a 
posix platform, those flags are not passed to C extension modules, leaving 
users (in the worst case) lost without the ability to build and install C 
extension modules, if the flags are important for detecting include files or 
linking.

Example:

* Python shall be built with GNU pthreads (--with-pth)
* The pth libs are not installed in any default location, CPP and LD know 
about, but somewhere else (e.g. /usr/local/lib/pth/ and /usr/local/include/pth/)
* Appropriate CPPFLAGS=-I/usr/local/include/pth and 
LDFLAGS=-L/usr/local/lib/pth are defined in the environment for the build.

Python gets built and installed. Result in /wherever/pythonX.X/config/Makefile:

...
OPT=
BASECFLAGS= -fno-strict-aliasing
CFLAGS= $(BASECFLAGS) -pipe $(OPT) $(EXTRA_CFLAGS)
...
CPPFLAGS=   -I. -IInclude -I$(srcdir)/Include -I/usr/local/include/pth
LDFLAGS=-L/usr/local/lib/pth
...

Invocation of python-config --cflags:

# python-config --cflags 
-I/whereever/include/pythonX.X -I/whereever/include/pythonX.X 
-fno-strict-aliasing -pipe 

Invocation of python-config --ldflags:

# python-config --ldflags 
-L/whereever/lib/pythonX.X/config -lpth -lutil -lm -lpythonX.X


So far, so problematic. Since Python.h incorporates pth.h, compiling something 
without defining the necessary CPPFLAGS manually will fail. Same for linking.

The issue is *not* limited to --with-pth, but to any CPPFLAGS/LDFLAGS settings 
that are necessary to get CPython to work on the target platform. One might 
argue that CPPFLAGS should go to CFLAGS, but that contradicts the purpose of 
CPPFLAGS and CFLAGS.

At least for posix-alike platforms (those for which _init_posix() is called in 
distutils/sysconfig.py), it is necessary that both, python-config as well as 
the distutils internals add the appropriate CPPFLAGS.

It might be argued that one should use CFLAGS instead of CPPFLAGS for such 
important additional flags, but what shall be done with LDFLAGS then?

--
assignee: eric.araujo
components: Build, Distutils, Extension Modules
messages: 162405
nosy: eric.araujo, marcusva, tarek
priority: normal
severity: normal
status: open
title: Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on 
posix
type: behavior
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2

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[issue15018] Incomplete Python LDFLAGS and CPPFLAGS used for extension modules on posix

[Jesús Cea Avión]

Changes by Jesús Cea Avión j...@jcea.es:


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