Re: Linux 2.6.27.27

[Marc Dionne <marc.c.dionne@gmail.com>]

On 07/20/2009 07:56 PM, Linus Torvalds wrote:
>
> On Mon, 20 Jul 2009, Marc Dionne wrote:
>> I might be seeing a slightly different bug, but in case it's helpful, the
>> behaviour here on Fedora rawhide with gcc-4.4.0-14.x86_64 and
>> binutils-2.19.51.0.11-27.fc12.x86_64 is that I get various .o files that come
>> out as completely empty files (or in one case as a precisely 64K sized file
>> that gives a "File format not recognized" error"), and the latest 2.6.31-rc
>> git can't be built at all.
>
> Hmm. This sounds more like the binutils bug that people had. Sounds like
> an assembler bug if the *.o file ends up being empty or at some fixed
> size. If it was cc1 that fails, I'd expect to not see an *.o file at all,
> since it didn't generate good assembly.
>
> In fact, your behavior sounds like the thing that produces the *.o files
> core-dumped or died for other reasons, and had a 64kB buffer that either
> got flushed or not. That would explain the "zero or exactly 64kB" size.
>
> It could be ccache too, of course.

Actually in my case it turns out that it is ccache after all - if I 
remove it from the picture everything is fine.  If I re-enable it, even 
with a clean cache, I get the problem.

It might just be a coincidence that it's triggered by the -fwrapv change.

Marc