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Common variables will be flagged as errors by default. This can
be overridden with -fcommon.
Cherry-pick this change that will be part of LLVM11. We bring it
forward so we can finish fixing the fallout in the ports tree.
ok deraadt@ sthen@ mglocker@
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This adapts the -mfix-loongson2f-btb workaround from as(1) to
LLVM/clang. Because LLVM emits machine code directly without using
assembly as intermediary form, the workaround has to be applied
in the compiler backend in addition to the integrated assembler.
Discussed with miod@
OK mortimer@
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ok deraadt@ kettenis@
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llvm 9 and later take more care not to inline cmpxchg8b/cx8 with
-march=i486 instead calling __atomic_* functions. This in turn breaks
the build of a large number of ports.
To avoid having to add a lock or conditionally building individual ports
with -march=i586 change the default so 64 bit atomics will always be
available.
ok patrick@ sthen@ deraadt@
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ok hackroom
tested by plenty
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naddy
visa
mortimer
patrick
jsg