From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: Build problems with xen 4.7
Date: Tue, 01 Dec 2015 09:09:10 -0700
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Marcos Matsunaga <marcos.matsunaga@oracle.com>, xen-devel@lists.xen.org, M A Young <m.a.young@durham.ac.uk>
List-Id: xen-devel@lists.xenproject.org

>>> On 01.12.15 at 16:59, <konrad.wilk@oracle.com> wrote:
> On Tue, Dec 01, 2015 at 08:56:03AM -0700, Jan Beulich wrote:
>> >>> On 01.12.15 at 15:36, <konrad.wilk@oracle.com> wrote:
>> > On December 1, 2015 8:19:32 AM EST, Jan Beulich <JBeulich@suse.com> wrote:
>> >>>>> On 01.12.15 at 00:37, <m.a.young@durham.ac.uk> wrote:
>> >>> When I try to build the current xen 4.7 master I get the following
>> >>error
>> >>> 
>> >>> <command-line>:0:0: error: "__OBJECT_FILE__" redefined [-Werror]
>> >>> <command-line>:0:0: note: this is the location of the previous
>> >>definition
>> >>> cc1: all warnings being treated as errors
>> >>> 
>> >>> The problem seems to be that -D__OBJECT_FILE__= is set each time 
>> >>> xen/Rules.mk is called, which happens more than once because of
>> >>nested 
>> >>> makes resulting in multiple diffent values for -D__OBJECT_FILE__=
>> >>
>> >>Considering you're the first one to have such a problem, I think the
>> >>precise compiler version you use matters here. Also the redundant
>> >>definitions shouldn't be different, and identical re-definition should
>> >>not yield a diagnostic. So I think there's a little more data you need
>> >>to supply in order to determine whether we need to adjust something.
>> >>
>> > 
>> > Ccing Marcos who also saw this. Marcos do you remember the git commit that 
>> > caused this?
>> 
>> There's no question about when this got introduced. What we need
>> to understand is why this is an issue only for very few people.
> 
> It is only an issue when doing rpmbuilds.
> 
> Not when doing the build outside of that.

I.e. there must be something different in how make gets invoked or
the environment set up.

Jan