bpo-35903: Use autoconfig to probe for shm_open() and shm_unlink(). #11765
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AC_SEARCH_LIBS will execute the success clause even if -lrt is not needed. So, check the result and define HAVE_RT_SHM_OPEN only if linking with -lrt is really needed.
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That looks like a winner to me. Given all the other discussions going on around shared memory at the moment, it might be worth holding off merging right away... or would that actually be counter-productive? |
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I would be inclined to merge. It is easy to back out if needed but I think it makes things better. I understand the plan is to not revert your e5ef45b change. |
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@nascheme: Please replace |
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The logic in setup.py that determines if _multiprocessing/posixshmem.c should get built is not very robust. I think it is better to use autoconfig to probe for the required functions and libraries. My autoconfig brain cells are a bit fuzzy but I think my patch is correct.
I look for shm_open and shm_unlink. I also check if librt is required for these functions.
https://bugs.python.org/issue35903