a751f5cd7c
- Change the default -march for i386 from i486 to i586. This avoids the need for libatomics and had been the defacto default for some time. [0] - Add -m(no)-spe to clang. (powerpc) - Deduce MIPS specific ELF header flags from `emulation`. (mips) - Fix a variety of assertions and compile/link errors including crashes with CPUTYPE=haswell. [1] - Switch back to https for downloads. [2] The new patches were initially committed to FreeBSD src by dim@. PR: 240918 [0], 240759 [1], 240870 [2] Reported by: jbeich [0,1], Miyashita Touka <imagin8r@protonmail.com> [2]
37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
commit 5f6a983e7fba98335e2863fe31305e895545ebb2
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Author: dim <dim@FreeBSD.org>
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Date: Sun Sep 8 10:31:34 2019 +0000
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Target i586 by default on the i386 architecture, since after upstream's
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change https://reviews.llvm.org/rL356631 ("[X86] Add CMPXCHG8B feature
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flag. Set it for all CPUs except i386/i486 including 'generic'. Disable
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use of CMPXCHG8B when this flag isn't set"), clang now correctly emits
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calls to __atomic_load_8, __atomic_store_8, etc. when targeting i486,
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and this means we can no longer link most modern programs, because we do
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not have a libatomic, nor support for atomic functions in libc. See
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also PR 230888, 220822, 233725, 234976, and more probably duplicates.
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Note that in practice, clang has been incorrectly generating cmpxchg8b
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instructions for years now, when targeting i486. So de facto nothing
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really changes by doing this.
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Notes:
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svn path=/projects/clang900-import/; revision=352030
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diff --git tools/clang/lib/Driver/ToolChains/Arch/X86.cpp tools/clang/lib/Driver/ToolChains/Arch/X86.cpp
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index 34be226b69e9..9a5c0aa28c7f 100644
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--- tools/clang/lib/Driver/ToolChains/Arch/X86.cpp
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+++ tools/clang/lib/Driver/ToolChains/Arch/X86.cpp
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@@ -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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+ 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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