[Python-Dev] Partial support for dlmodule.c in 64-bits OSes (original) (raw)

Thomas Heller theller at python.net
Fri Jul 14 17:09:37 CEST 2006

Pierre Baillargeon schrieb:

Currently, many 64-bits Oses cannot uses the dlmodule due to the conflicts between the sizes of int, long and char *. That is well. The check is made as run-time, which is also very well.

The problem is that the Python configuration script (setup.py) also makes the check and plainly excludes dlmodule.c from being built and deployed. That is not so well. The reason is that we use the dlmodule solely to get access to the various flags (RTLDNOW, RTLDGLOBAL, etc), so that we can do some magic with loaded shared libraries, such as over-ridding the import mechanism so that the default load flags get changed (via sys.setdlopenflags()) to force some semantics. Currently this doesn't work on most 64-bits OSes because the dl module doesn't exists, so it cannot be imported and its RTLD* symbols are not accessible. So I ask if it would be possible that the test for sys.maxint == 0x7fffffff in setup.py be dropped in future releases.

I don't know if your patch is acceptable or not, but if it is applied Lib/test/test_dl.py crashes on 64-bit platforms, so this must be changed as well. Further, patches should be uploaded to the SF tracker so they don't get lost or forgotten.

OTOH, the RTLD_ constants are possibly available in the DLFCN module, as the documentation explains.

Thomas

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