Re: Build problems with xen 4.7

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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@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.
> 

Still an issue - with 4.7.0-rc1.

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 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -O1 -fno-omit-frame-pointer -m64 -DBUILD_ID -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -nostdinc -fno-builtin -fno-common -Werror -Wredundant-decls -Wno-pointer-arith -pipe -g -D__XEN__ '-D__OBJECT_FILE__="/home/konrad/ssd/konrad/xen/xen/xen"' -Wa,--strip-local-absolute -fno-optimize-sibling-calls -DVERBOSE -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER -fno-optimize-sibling-calls -I/home/konrad/ssd/konrad/xen/xen/include -I/home/konrad/ssd/konrad/xen/xen/include/asm-x86/mach-generic -I/home/konrad/ssd/konrad/xen/xen/include/asm-x86/mach-default '-D__OBJECT_LABEL__=omeonradsdonradenen$homeonradsdonradenenen' -msoft-float -fno-stack-protector -fno-exceptions -Wnested-externs -mno-red-zone -mno-sse -fpic -fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -O1 -fno-omit-frame-pointer -m64 -DBUILD_ID -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -O1 -fno-omit-frame-pointer -m64 -DBUILD_ID -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -nostdinc -fno-builtin -fno-common -Werror -Wredundant-decls -Wno-pointer-arith -pipe -g -D__XEN__ '-D__OBJECT_FILE__="compat/callback.i"' -Wa,--strip-local-absolute -fno-optimize-sibling-calls -DVERBOSE -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER -fno-optimize-sibling-calls -I/home/konrad/ssd/konrad/xen/xen/include -I/home/konrad/ssd/konrad/xen/xen/include/asm-x86/mach-generic -I/home/konrad/ssd/konrad/xen/xen/include/asm-x86/mach-default '-D__OBJECT_LABEL__=include$compat$callback.i' -msoft-float -fno-stack-protector -fno-exceptions -Wnested-externs -mno-red-zone -mno-sse -fpic -fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -O1 -fno-omit-frame-pointer -m64 -DBUILD_ID -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -include public/xen-compat.h -m32 -o compat/callback.i compat/callback.c
<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


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