Problem with linking embedding C application
Mads Bondo Dydensborg
madsdyd at challenge.dk
Mon Oct 1 14:01:21 CEST 2001
On Mon, 1 Oct 2001, Olivier Deme wrote:
> Thanks for the link to the demo application.
> Indeed it seems that there a plenty of libraries to link with...
> Something also really annoying:
> The libraries are located in an unusual place on my machine:
> Plus, the fact that libpython*.a has its version number in the file name.
> That means that if our customer has a different version of Python, they
> won't be able to link our application!
> Usually, this should be solved by adding a symbolink link in a common
> directory. Sonething like:
> /usr/lib/libpython.a -> /usr/local/lib/python2.1/config/libpython2.1.a
> But this is not done during installation of Python. How are we supposed to know
> the version used by the people who are going to build our application?
I have found that out - the pygtk code includes autoconf (are you using
autoconf) code that calls python (douh). (This is just an expert, be sure
to review the entire file - acinclude.m4 from the pygtk distribution).
import sys, string
minver = '$1'
pyver = string.split(sys.version) # first word is version string
# split strings by '.' and convert to numeric
minver = map(string.atoi, string.split(minver, '.'))
if hasattr(sys, 'version_info'):
pyver = sys.version_info[:3]
pyver = map(string.atoi, string.split(pyver, '.'))
# we can now do comparisons on the two lists:
if pyver >= minver:
if $PYTHON -c "$prog" 1>&AC_FD_CC 2>&AC_FD_CC
The library can be found from constructions like the following
py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
There are standard places the library go, when you have the exec_prefix (I
Linking is the great problem here (linker options). I found
(it is 4000 lines). Search for KDE_CHECK_PYTHON for how they test for some
common linker requirements.
It is a mess though.
Mads Bondo Dydensborg. madsdyd at challenge.dk
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