Re: [Xen-devel] Build problems with xen 4.7

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.05.16 at 15:49, <konrad.wilk@xxxxxxxxxx> wrote:
> On Tue, Dec 01, 2015 at 10:59:41AM -0500, Konrad Rzeszutek Wilk wrote:
>> On Tue, Dec 01, 2015 at 08:56:03AM -0700, Jan Beulich wrote:
>> > >>> On 01.12.15 at 15:36, <konrad.wilk@xxxxxxxxxx> wrote:
>> > > On December 1, 2015 8:19:32 AM EST, Jan Beulich <JBeulich@xxxxxxxx> 
>> > > wrote:
>> > >>>>> On 01.12.15 at 00:37, <m.a.young@xxxxxxxxxxxx> 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.
>> 
> 
> Still an issue - with 4.7.0-rc1.

And I don't recall anyone having contributed a fix/workaround.

> If I do:
> 
> $export CFLAGS=" "'
> $make
> 
> I end up with:
> gcc -E -O1 -fno-omit-frame-pointer -m64 -DBUILD_ID -g -fno-strict-aliasing 
> -std=gnu99 
>[...]
> <command-line>:0:0: error: "__OBJECT_FILE__" redefined [-Werror]
> <command-line>:0:0: note: this is the location of the previous definition
> <command-line>:0:0: error: "__OBJECT_LABEL__" redefined [-Werror]
> <command-line>:0:0: note: this is the location of the previous definition
> cc1: all warnings being treated as errors
> Makefile:62: recipe for target 'compat/callback.i' failed

My previous recommendation stands: Then just don't do this.

Jan


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