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

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Tue, 1 Dec 2015, Jan Beulich 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.

This is just with Fedora's gcc-5.1.1-4.fc23.x86_64 with the standard 
package build options, including -Werror . The values of 
-D__OBJECT_FILE__= really are different, with (from memory) the first 
being the absolute path to the /xen subdirectory of the unpacked xen-4.7 
source and the second a relative path to the file being complied from 
there.

        Michael Young

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