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Re: [Libvir] [PATCH] A variety of fixes for Debian, old versions of GnuTLS



On Tue, Aug 07, 2007 at 12:56:39PM +0100, Richard W.M. Jones wrote:
> Attached is a patch to get libvirt working on Debian/stable again.
> 
> (1) Add ./configure option --disable-stack-protector.  The stack 
> protector feature is still enabled by default, but it causes no end of 
> problems when compiling on Debian systems, apparently because of bugs in 
> their gcc.  So Debian users would be well advised to try disabling it if 
> they have problems building.

I'm a little puzzled why this change was needed. The configure script
takes each compiler flag in turn & attempts to compile a test program.
If this test fails it doesn't use the flag for main libvirt build. Any
ideas why the configure test succeeeded, but libvirt build didn't ?

> (2) Adds support for GnuTLS 1.0.x by detecting this version and enabling 
> some simple compatibility macros.

Looks fine.

> (3) In qemudDispatchClientEvent, a prototype shadowed a global function 
> name.  A simple name change to a parameter fixes it.

looks fine.

> (4) Debian (and likely non-Linux systems also) don't have the 
> SIOCBRADDBR and related ioctls.  If these are missing, then I've changed 
> this to runtime errors.  This means that these systems won't be able to 
> start the network daemon, but other (non-network) features of libvirt 
> continue to work.

This is quite a long standing issue with kernel headers. Only very recently
(Fedora 6) and later are the glibc kernel headers actually generated from
the kernel sources. Prior to this pretty much every distro shipped kernel
headers based on some ancient kernel version. This didn't have SIOCBRADDBR
and friends, even though the kernel has had full support for this for years.

Looking at the bridge-utils source code, they simply #define all the missing
constants if they're not part of kernel headers. We could do the same and
thus make bridging stuff work on Debian too.

Regards,
Dan
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