Re: gcc trunk fails to build kernel on PowerPC64 due to oprofile warnings

[William Cohen <wcohen@redhat.com>]

On 01/26/2017 11:06 AM, Robert Richter wrote:
> On 26.01.17 10:46:43, William Cohen wrote:
>> From 7e46dbd7dc5bc941926a4a63c28ccebf46493e8d Mon Sep 17 00:00:00 2001
>> From: William Cohen <wcohen@redhat.com>
>> Date: Thu, 26 Jan 2017 10:33:59 -0500
>> Subject: [PATCH] Avoid hypthetical string truncation in oprofile stats buffer
>> MIME-Version: 1.0
>> Content-Type: text/plain; charset=UTF-8
>> Content-Transfer-Encoding: 8bit
>>
>> Increased the size of an internal oprofile driver buffer ensuring that
>> the string was never truncated for any possible int value to avoid the
>> following gcc-7 compiler error on ppc when building the kernel:
> 
> Please test gcc7 for other archs first. I don't think this is the only
> change needed to avoid this warning in oprofile code.
> 
> Thanks,
> 
> -Robert

Hi Robert,

It took me a little while to get a gcc-7 environment set up with Fedora Rawhide on x86_64.  I have a kernel building now with gcc-7 and will see what other issues pop up during the compile.

While watching the output of the build I see the gcc-7 error message about truncating output of snprintf output seems to occur for a number of other places besides the oprofile kernel code during the compile.

-Will