Target i586 by default on the i386 architecture, since after upstream's
change https://reviews.llvm.org/rL356631 ("[X86] Add CMPXCHG8B feature flag. Set it for all CPUs except i386/i486 including 'generic'. Disable use of CMPXCHG8B when this flag isn't set"), clang now correctly emits calls to __atomic_load_8, __atomic_store_8, etc. when targeting i486, and this means we can no longer link most modern programs, because we do not have a libatomic, nor support for atomic functions in libc. See also PR 230888, 220822, 233725, 234976, and more probably duplicates. Note that in practice, clang has been incorrectly generating cmpxchg8b instructions for years now, when targeting i486. So de facto nothing really changes by doing this.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/projects/clang900-import/; revision=352030
@ -93,10 +93,10 @@ const char *x86::getX86TargetCPU(const ArgList &Args,
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return "x86-64";
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switch (Triple.getOS()) {
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case llvm::Triple::FreeBSD:
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case llvm::Triple::NetBSD:
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case llvm::Triple::OpenBSD:
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return "i486";
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return "i486";
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case llvm::Triple::FreeBSD:
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case llvm::Triple::Haiku:
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return "i586";
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default:
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