[Bug bootstrap/78985] [7 Regression] profiledbootstrap failure by -Wuninitialized

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78985

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On January 20, 2017 3:07:37 PM GMT+01:00, "marxin at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78985
>
>--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
>(In reply to rguenther@suse.de from comment #4)
>> On Fri, 20 Jan 2017, marxin at gcc dot gnu.org wrote:
>> 
>> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78985
>> > 
>> > Martin Liška <marxin at gcc dot gnu.org> changed:
>> > 
>> >            What    |Removed                     |Added
>> >
>----------------------------------------------------------------------------
>> >              Status|UNCONFIRMED                 |NEW
>> >    Last reconfirmed|                            |2017-01-20
>> >            Assignee|unassigned at gcc dot gnu.org      |marxin at
>gcc dot gnu.org
>> >      Ever confirmed|0                           |1
>> > 
>> > --- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
>> > I'll try to bisect that, on aarch64 machine I see:
>> > 
>> > ../../gcc/config/aarch64/cortex-a57-fma-steering.c: In member
>function ‘void
>> > func_fma_steering::analyze()’:
>> > ../../gcc/config/aarch64/cortex-a57-fma-steering.c:979:53: error:
>‘head’ may be
>> > used uninitialized in this function [-Werror=maybe-uninitialized]
>> >     this->analyze_fma_fmul_insn (forest, chain, head);
>> >                                                      ^
>> > ../../gcc/config/aarch64/cortex-a57-fma-steering.c:979:53: error:
>‘forest’ may
>> > be used uninitialized in this function
>[-Werror=maybe-uninitialized]
>> > ../../gcc/config/aarch64/cortex-a57-fma-steering.c:979:53: error:
>‘chain’ may
>> > be used uninitialized in this function
>[-Werror=maybe-uninitialized]
>> > 
>> > I'll try to bisect..
>> 
>> Yes, aarch64 has a similar issue.
>
>This is aarch64 machine :) Do you remember whether profiledbootstrap
>used to
>succeed (for bisect start)?

It used to, yes.  It at least works on the branch.