v3.0.x: atomic 128 fixes #5617
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v3.0.x: atomic 128 fixes #5617
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Thanks to Stefan Teleman for identifying this issue and providing a
proof-of-concept patch. We ended up revamping the detection of
128-bit atomics to reduce duplicated code and be a slightly simpler --
albiet perhaps a bit more verbose -- approach:
- Remove the --enable-cross-* options; they were confusing and
unnecessary.
- Always try to compile / link the compiler-intrinsic 128-bit atomic
functions.
- Strengthen the C tests we use to be more robust.
- Use m4 to avoid duplicating the C tests multiple times in the .m4
source.
- If not cross-compiling, try to run a short test and ensure that they
actually work (as of Aug 2018, there's at least one platform where
they don't: clang 6 on ARM64). If cross-compiling, just assume that
they work.
- Add more comments about what is going on with all the tests; it's
tricky stuff. Our Future Selves will thank us.
Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit ff9df91)
Thanks to George for finding/fixing these. Signed-off-by: Jeff Squyres <jsquyres@cisco.com> (cherry picked from commit 9194dbb)
bosilca
approved these changes
Aug 28, 2018
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Bring over the 128 bit atomic fixes and one additional minor m4 cleanup commit (the tabs->spaces commit from #5546 did not apply cleanly, and isn't worth it to apply over here).