Re: RFC: static builds for user emulators in Fedora QEMU RPMs

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On Wed, Jun 29, 2016 at 04:54:42PM +0200, Florian Weimer wrote:
> On 06/29/2016 12:34 PM, Daniel P. Berrange wrote:
> > On Wed, Jun 29, 2016 at 12:15:02PM +0200, Florian Weimer wrote:
> > > On 06/29/2016 12:03 PM, Daniel P. Berrange wrote:
> > > > Debian handles this by having several packages [1]
> > > > 
> > > >  - qemu-user - the dynamic linked qemu user binaries
> > > >  - qemu-binfmt - binfmt rules registering the dynamic linked binaries
> > > >  - qemu-user-static - the static linked qemu user binaries *and* binfmt
> > > >                       rules to register them. The static binaries all
> > > > 		      have -static suffix on their name
> > > 
> > > Debian builds static libraries and puts them into their -dev packages.
> > > Fedora does not do this systematically.  Are all the static libraries you
> > > need actually available in Fedora?
> > 
> > Yes, everything we need exists - as mentioned its only glibc-static,
> > glib2-static, zlib-static and pcre-static that we need for this.
> 
> In this case, linking statically is indeed an option.
> 
> We currently have little tooling for static libraries.  Strictly speaking,
> all statically linked libraries have to be rebuilt even for minor glibc
> updates because we do not provide ABI compatibility for static linking
> (there are no compatibility symbols, static binaries always get the most
> recent implementation).

Yep, I understand those caveats - the flipside is that most other Linux
distros already provide statically linked qemu user emulators with glibc
without suffering unduly. So while I accept there are potential problems,
it doesn't seem like they're frequent / severe enough to make this approach
unviable.

Regards,
Daniel
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