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Re: [PATCH] RISC-V: Fix elfutils testsuite unwind failures.

From: Jim Wilson <jimw at sifive dot com>
To: Mark Wielaard <mark at klomp dot org>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Tue, 22 Jan 2019 22:58:35 -0800
Subject: Re: [PATCH] RISC-V: Fix elfutils testsuite unwind failures.
References: <20190113234809.4818-1-jimw@sifive.com> <fe71f6cdfc7fe3970c38f06437fbc5cde8a78a57.camel@klomp.org> <CAFyWVaY=EcAMpW8Qn+-i9iqFtuaa0jrFGoFABwSYxKSJFnp0EQ@mail.gmail.com> <5c03692dd8c9b1f230487a2a5b75ce5024a7d54c.camel@klomp.org>

On Tue, Jan 22, 2019 at 5:28 AM Mark Wielaard <mark@klomp.org> wrote:
> The distro might build with -fasynchronous-unwind-tables which would
> make sure that only the CFI unwinder is used, while without it, it
> might be that there is a frame that might have to be handled by the
> fallback unwinder.

Thanks.  That indeed turns out to be the problem here.  I see in the
fedora glibc rpm that it is using CFLAGS="-O2 -g
-fasynchronous-unwind-tables".  When I configure and build glibc that
way, the testcase behaves the way I expect.  It fails without my
__thread_start patch and works with my patch.

Jim

References:
- [PATCH] RISC-V: Fix elfutils testsuite unwind failures.
  - From: Jim Wilson
- Re: [PATCH] RISC-V: Fix elfutils testsuite unwind failures.
  - From: Mark Wielaard
- Re: [PATCH] RISC-V: Fix elfutils testsuite unwind failures.
  - From: Jim Wilson
- Re: [PATCH] RISC-V: Fix elfutils testsuite unwind failures.
  - From: Mark Wielaard

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