[Python-bugs-list] [ python-Bugs-668662 ] Compiling C sources with absolute path bug

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Bugs item #668662, was opened at 2003-01-15 20:59
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Category: Distutils
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Pearu Peterson (pearu)
Assigned to: A.M. Kuchling (akuchling)
Summary: Compiling C sources with absolute path bug

Initial Comment:
Py-2.3 distutils is broken in the following situation
when building extension modules:
If a file in C sources list is given with absolute
path, say
/path/to/foo.c then Py-2.3 distutils tries to create
the corresponding    
object file to /path/to/foo.o (earlier versions would
create it to, say, build/temp.linux-i686-2.2/foo.o).
This causes problems when
1) an user does not have permissions to write to
/path/to/, e.g. in multiuser systems
2) an user builds extension modules, say, using
different compilers or flags. Then /path/to/foo.o will
be in a way for subsequent builds.
IMHO, distutils should not create any files outside the
given
build directory, unless explicitely specified using
--build-temp.

Fix:
The problematic code seems to be in the method
ccompiler.object_filenames in file distutils/ccompiler.py.
As a fix, I suggest using the following object name for
a C source if given with absolute path: 
  ./build/temp.linux-i686-2.2/path/to/foo.o.

This can be achived by inserting the following line
just after
the line `base, ext = os.path.splitext(src_name)`:

 base = base[os.path.isabs(base):]

Pearu

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>Comment By: Pearu Peterson (pearu)
Date: 2003-02-16 22:11

Message:
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Attached patch maps the base of a source file with absolute
path (and 
drive if present) to relative path before composing the
corresponding object file. This avoids creation of object
files out of the build directory. 

Pearu

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Comment By: Michael Hudson (mwh)
Date: 2003-01-16 15:28

Message:
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Actually, I guessed after posting that something like that
could happen.

BTW, I strongly suspect this is related to the fix for this bug:

[ 599248 ] ext module generation problem

Can you come up with a patch for your suggested fix?  I'm
sure Andrew would appreciate it :-)

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Comment By: Pearu Peterson (pearu)
Date: 2003-01-15 21:48

Message:
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FYI, distutils does not make this absolute path, but one can
specify
absolute paths in setup.py files, for instance.
Also, tools that create extension modules (e.g. f2py), may
ship with C sources that are installed as data files and
compiled
for each generated extension module separately (possibly
with different
compilers and flags so that pre-compilation of such sources
would not be an option).


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Comment By: Michael Hudson (mwh)
Date: 2003-01-15 21:23

Message:
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I'm a little boggled by how distutils would get an absolute
path, but I'm going to assign this to amk anyway :)

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