Re: [Qemu-devel] [PATCH] qemu-log: default to stderr for logging output

[Peter Maydell]

On 12 February 2013 17:50, Andreas Färber <address@hidden> wrote:
> Am 12.02.2013 18:33, schrieb Peter Maydell:
>> Stefan suggested that qemu_log should default to stderr, and I
>> agree that it makes more sense than a random file in /tmp/.
>> As noted in the commit message, this is technically an incompatible
>> change.
>
> I don't think this change is okay, it should be limited to the softmmus.
> Having random debug output appear on stderr may well break linux-user
> test suites or use cases.

Debug output will only appear on stderr if you asked for it by
passing -d something. This isn't any different to the softmmu
case (where it is also the case that random debug output might
break things, and also that you won't get it unless you ask).

I agree that it might break weird use cases (where you're running
some existing scripted usecase with debug logging enabled for some
reason); the tradeoff for those people having to tweak their script
to add "-D /tmp/qemu.log" is that we make things better for the
common user who mostly doesn't run with debug but who can now run
with '-d unimp,guest_errors' and get those messages usefully
interspersed with guest output.

-- PMM