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Re: [Qemu-devel] [PATCH RFC] Makefile.target: prepend $libs_softmmu to $

From: Wei Liu
Subject: Re: [Qemu-devel] [PATCH RFC] Makefile.target: prepend $libs_softmmu to $LIBS
Date: Mon, 9 Mar 2015 15:23:12 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

On Tue, Mar 10, 2015 at 12:11:44AM +0900, Peter Maydell wrote:
> On 9 March 2015 at 23:54, Wei Liu <address@hidden> wrote:
> > I discovered a problem when trying to build QEMU statically with gcc.
> > libm is an element of LIBS while libpixman-1 is an element in
> > libs_softmmu. Libpixman references functions in libm, so the original
> > ordering makes linking fail.
> >
> > This fix is to reorder $libs_softmmu and $LIBS to make -lm appear after
> > -lpixman-1. However I'm not quite sure if this is the right fix, hence
> > the RFC tag.
> >
> > Normally QEMU is built with c++ compiler which happens to link in libm
> > (at least this is the case with g++), so building QEMU statically
> > normally just works and nobody notices this issue.
> Actually I think nobody notices it because they don't statically
> link the softmmu executables. Static linking is really intended
> for the linux-user executables.
> Maybe we should actively stop configure allowing a static build
> of the softmmu and tools binaries, rather than having configs which
> nobody really tests? Or is there a genuine use case for them?

I'm trying to build QEMU as Xen's stubdom. That would certainly require
static linking. This is a usecase we care. An we can also test this
configuration after we make everything work and put things into our own
test system.


> thanks
> -- PMM

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