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clang: allow -fstack-clash-protection on FreeBSD
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Authored by emaste on Nov 25 2020, 1:03 AM.
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Summary

-fstack-clash-protection was added in Clang commit e67cbac81211 but was enabled only on Linux. It should work fine on FreeBSD too so enable it.

To be upstreamed, with a corresponding test suite change.

Relnotes: Yes
MFC after: 3 days

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rS FreeBSD src repository - subversion
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