Re: [Qemu-devel] [PATCH v2 3/3] util: remove redundant include of glib.h

[Peter Xu <peterx@redhat.com>]

On Thu, Jun 07, 2018 at 09:26:51AM +0100, Daniel P. Berrangé wrote:
> On Thu, Jun 07, 2018 at 03:44:56PM +0800, Peter Xu wrote:
> > On Thu, Jun 07, 2018 at 09:05:28AM +0200, Markus Armbruster wrote:
> > > Peter Xu <peterx@redhat.com> writes:
> > > 
> > > > On Wed, Jun 06, 2018 at 07:31:53PM +0100, Peter Maydell wrote:
> > > >> On 6 June 2018 at 18:32, Daniel P. Berrangé <berrange@redhat.com> wrote:
> > > >> > Code must only ever include glib.h indirectly via the glib-compat.h
> > > >> > header file, because we will need some macros set before glib.h is
> > > >> > pulled in. Adding extra includes of glib.h will (soon) cause compile
> > > >> > failures such as:
> > > >> >
> > > >> > In file included from /home/berrange/src/virt/qemu/include/qemu/osdep.h:107,
> > > >> >                  from /home/berrange/src/virt/qemu/include/qemu/iova-tree.h:26,
> > > >> >                  from util/iova-tree.c:13:
> > > >> > /home/berrange/src/virt/qemu/include/glib-compat.h:22: error: "GLIB_VERSION_MIN_REQUIRED" redefined [-Werror]
> > > >> >  #define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_40
> > > >> >
> > > >> > In file included from /usr/include/glib-2.0/glib/gtypes.h:34,
> > > >> >                  from /usr/include/glib-2.0/glib/galloca.h:32,
> > > >> >                  from /usr/include/glib-2.0/glib.h:30,
> > > >> >                  from util/iova-tree.c:12:
> > > >> > /usr/include/glib-2.0/glib/gversionmacros.h:237: note: this is the location of the previous definition
> > > >> >  # define GLIB_VERSION_MIN_REQUIRED      (GLIB_VERSION_CUR_STABLE)
> > > >> >
> > > >> > Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> > > >> > ---
> > > >> >  util/iova-tree.c | 1 -
> > > >> >  1 file changed, 1 deletion(-)
> > > >> >
> > > >> > diff --git a/util/iova-tree.c b/util/iova-tree.c
> > > >> > index 2d9cebfc89..d39cd8bb29 100644
> > > >> > --- a/util/iova-tree.c
> > > >> > +++ b/util/iova-tree.c
> > > >> > @@ -9,7 +9,6 @@
> > > >> >   * This work is licensed under the terms of the GNU GPL, version 2 or later.
> > > >> >   */
> > > >> >
> > > >> > -#include <glib.h>
> > > >> >  #include "qemu/iova-tree.h"
> > > >> 
> > > >> While we're fixing up the headers in this file:
> > > >> it should start with an include of qemu/osdep.h,
> > > >> and qemu/iova-tree.h should not include osdep.h...
> > > >
> > > > Sorry to messed this up.  It was used for hwaddr definition.
> > > >
> > > > Maybe we can just replace hwaddr usage in iova-tree.[ch] with
> > > > something like uint64_t?  Then I think we can drop the osdep.h.
> > > 
> > > Every compilation unit must include "osdep.h" first.  Its file comment
> > > explains why.  If it's insufficiently convincing, we should fix it :)
> > 
> > Ah... :)
> > 
> > Then maybe also we can let iova-tree.c to include osdep.h (instead of
> > glib.h), and remove that line in iova-tree.h
> 
> Yeah, I'll repost with that changed

Thanks for fixing that!

-- 
Peter Xu