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Re: [PATCH][4/4][v2] RPO-style value-numbering for FRE/PRE
On 09/10/2018 02:19 PM, Gerald Pfeifer wrote:
> On Mon, 10 Sep 2018, Martin Liška wrote:
>> I can reproduce that locally in a KVM machine running FreeBSD test
>> 10.4-RELEASE. I used gcc version 6.4.0 (FreeBSD Ports Collection) to
>> build stage1 compiler and I can see Segfaults happening.
>
> Great, thanks for helping look into this, Martin!
>
>> Issue is that neither valgrind nor gdb work on the system.
>> Valgrind has 2 PRs reported:
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224878
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228973
>>
>> For the gdb I can't see any lines associated:
>
> Which gdb are you using? (`which gdb` and/or `gdb --version`?)
>
> If, as I assume, it is the old one in the system (GDB 6.1.1) it
> may be worth a try installing the one from the ports/packages.
> Something like `pkg add gdb`, which should bring in GDB 8.1.1.
Works for me! One needed to add --wrapper gdb81,--args. So now I see a nice
back-trace.
>
>> Would be very handy to have at least one of these tools working.
>> Gerald can you please help us with that?
>
> I believe the GDB route is the more promising one (also having looked
> at the two PRs you found re valgrind on FreeBSD/i386). Quesiton is,
> is it more of a GDB issue, or perhaps debugging information missing?
>
> Let me know what you find, I may be able to ask others, closer to the
> FreeBSD toolchain for help.
Sure, I'll debug that more now.
Martin
>
> Gerald
>