Re: [Xen-devel] Mini-os fbfront.c unused variable complaint

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 08/02/2012 14:15, "Ian Campbell" <Ian.Campbell@xxxxxxxxxx> wrote:

> On Mon, 2012-02-06 at 19:05 +0000, John McDermott CIV wrote:
>> Xen Developers,
>> 
>> FWIW, in trying to compile mini-os on Xen 4.1.2, I get a variable set
>> but not used warning for variable 'message' in function init_kbdfront.
>> (Looks like another one just like it, in function init_fbfront, from
>> the same file.) My source won't compile with these warnings. I could
>> not find a patch for this in xen-4.1-testing.hg Xenbits.
> 
> This new, enabled by default, compiler warning is very annoying, even
> though it happens to be correct. Which distro has done it? (or maybe
> it's just new enough gcc which is to blame).

We should be disablign this warning in Config.mk, where we add
-Wno-unused-but-set-variable to CFLAGS. Perhaps mini-os needs to do the
same, if it is creating its own CFLAGS? Note that we add it in Config.mk via
$(call cc-option-add ...) because older gcc versions do not have this
warning.

 -- Keir

>> It looks like a conditional printk got left out after the label
>> 'abort_transaction'. I don't understand fbfront.c well enough to
>> suggest a patch. Its low priority for me, because I am going to stick
>> some plausible code in there for now.
> 
> I think an unconditional printk including the %s and message is all
> which is required here. If you've got some plausible code you may as
> well post it.
> 
> Thanks,
> Ian.
> 
>> 
>> Sincerely,
>> 
>> John
>> ----
>> What is the formal meaning of the one-line program
>> #include "/dev/tty"
>> 
>> J.P. McDermott   building 12
>> Code 5542   john.mcdermott@xxxxxxxxxxxx
>> Naval Research Laboratory voice: +1 202.404.8301
>> Washington, DC 20375, US fax:   +1 202.404.7942
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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> 
> 
> 
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