Re: [Xen-devel] [ANNOUNCE] First release candidates for Xen 4.0.4 and 4.1.3

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Mon, 7 May 2012, Keir Fraser wrote:

> Folks,
>
> I have just tagged first release candidates for 4.0.4 and 4.1.3:
>
> http://xenbits.xen.org/staging/xen-4.0-testing.hg (tag 4.0.4-rc1)
> http://xenbits.xen.org/staging/xen-4.1-testing.hg (tag 4.1.3-rc1)
>
> Please test!
I am seeing problems building 4.1.3-rc1 on Fedora 17, though it might be 
changes in Fedora 17 rather than xen changes that have triggered it. When 
trying to compile objects such as scheduler.c in tools/blktap2/drivers I 
get the error
/usr/include/features.h:329:3: error: #warning _FORTIFY_SOURCE requested but 
disabled [-Werror=cpp]

On checking that file I see that this is because -Wp,-D_FORTIFY_SOURCE=2 
is requested with -O0 . Fedora 17 decides to warn about this and it 
becomes an error as -Werror is specified.
This conflict occurs because of the line
CFLAGS += -Werror -g -O0
in tools/blktap2/drivers/Makefile
I can of course work around the problem in my build, but I was wondering 
if optimization level 0 is still necessary for this code. I think the 
only other place -O0 is used now is tools/security/Makefile which I 
assume will also trigger the problem.
        Michael Young

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