Date: Fri, 10 Aug 2018 19:58:35 +0000 From: bugzilla-noreply@freebsd.org To: toolchain@FreeBSD.org Subject: [Bug 230399] devel/libunwind: fails to build with Clang 7 Message-ID: <bug-230399-29464-b0aUQyjcnK@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-230399-29464@https.bugs.freebsd.org/bugzilla/> References: <bug-230399-29464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230399 --- Comment #8 from commit-hook@freebsd.org --- A commit references this bug: Author: dim Date: Fri Aug 10 19:57:56 UTC 2018 New revision: 337585 URL: https://svnweb.freebsd.org/changeset/base/337585 Log: In r308100, an explicit -fexceptions flag was added for the C sources from LLVM's libunwind, which end up in libgcc_eh.a and libgcc_s.so. This is because the unwinder needs the unwinder data for its own functions. However, for the C++ sources in libunwind, -fexceptions is already the default, and this can have the side effect of generating a reference to __gxx_personality_v0, the so-called personality function, which is normally provided by the C++ ABI library (libcxxrt or libsupc++). If the reference ends up in the eventual libgcc_s.so, linking any non-C++ programs against it will fail with "undefined reference to `__gxx_personality_v0'". Note that at high optimization levels, the reference is usually optimized away, which is why we have never noticed this problem before. With clang 7.0.0 though, higher optimization levels don't help anymore, since the addition of address-significance tables [1] in <https://reviews.llvm.org/rL337339>. Effectively, this always causes a reference to __gxx_personality_v0. After discussion with the upstream author of that change, it turns out that we should compile libunwind sources with the -fno-exceptions -funwind-tables flags instead. This ensures unwind tables are generated, but no references to any personality functions are emitted. [1] https://lists.llvm.org/pipermail/llvm-dev/2018-May/123514.html Reported by: jbeich PR: 230399 MFC after: 1 week Changes: head/lib/libgcc_eh/Makefile.inc --=20 You are receiving this mail because: You are the assignee for the bug.=
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