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Re: [Xen-devel] [PATCH] libxc: build fixes

To: Olaf Hering <olaf@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] libxc: build fixes
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Tue, 11 Jan 2011 12:46:09 +0000
Cc: Christoph Egger <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
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On Tue, 2011-01-11 at 10:41 +0000, Olaf Hering wrote:
> On Thu, Jan 06, Ian Jackson wrote:
> 
> > Christoph Egger writes ("[Xen-devel] [PATCH] libxc: build fixes"):
> > > Attached patch makes libxc build again on NetBSD after the recent rework.
> > 
> > I have applied this.  However:
> > 
> > I changed the name of the new make variable from LIBDL to DLOPEN_LIBS.
> > The latter conforms to the naming scheme for similar variables found
> > in config/*.mk - PTHREAD_LIBS et al.
> > 
> > Also I moved the setting of the variable to -dl from Linux to StdGNU
> > (which makes it apply more widely) and also added it to SunOS.mk
> > (based on pure guesswork).
> 
> This is incomplete. flask does not build because linking fails with
> missing dlopen/dlsym etc. This change fixes it for me.

I thought there was a way to convince ld to do this sort of thing
automatically without forcing higher layers to know all about the
transitive dependencies.

However we've got a bunch of this stuff already and I don't think anyone
really wants to go messing with the build system so close to the 4.1-rc0
anyway so:

> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Ian.

>  
> --- xen-unstable.hg-4.1.22697.orig/tools/Rules.mk
> +++ xen-unstable.hg-4.1.22697/tools/Rules.mk
> @@ -18,7 +18,7 @@ XEN_BLKTAP2        = $(XEN_ROOT)/tools/b
>  CFLAGS_include = -I$(XEN_INCLUDE)
>  
>  CFLAGS_libxenctrl = -I$(XEN_LIBXC) $(CFLAGS_include)
> -LDLIBS_libxenctrl = -L$(XEN_LIBXC) -lxenctrl
> +LDLIBS_libxenctrl = -L$(XEN_LIBXC) -lxenctrl $(DLOPEN_LIBS)
>  
>  CFLAGS_libxenguest = -I$(XEN_LIBXC) $(CFLAGS_include)
>  LDLIBS_libxenguest = -L$(XEN_LIBXC) -lxenguest
> 
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