Pkg xen devel - May 2011 - Bug#625438: xen: ftbfs with gcc-4.6 -Werror

Package: xen
Version: 4.1.0-3
Severity: important
Tags: wheezy sid
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-4.6 ftbfs-werror

This package builds with -Werror, and GCC 4.6 triggers new warnings
which will make the package fail to build.  Currently a Debian patch
just passes
    -Wno-error=unused-but-set-variable and
    -Wno-error=unused-but-set-parameter
to avoid build failures, but this patch will be reverted with the
GCC 4.6.1 release, and the severity of the report will be raised.

The full build log can be found at:
http://people.debian.org/~doko/tmp/werror/xen_4.1.0-3_lsid64.buildlog
The last lines of the build log are at the end of this report.

On Tue, 2011-05-03 at 10:34 +0000, Matthias Klose wrote:
> Package: xen
> Version: 4.1.0-3
> Severity: important
> Tags: wheezy sid
> User: debian-gcc at lists.debian.org
> Usertags: ftbfs-gcc-4.6 ftbfs-werror
> 
> This package builds with -Werror, and GCC 4.6 triggers new warnings
> which will make the package fail to build.  Currently a Debian patch
> just passes
>     -Wno-error=unused-but-set-variable and
>     -Wno-error=unused-but-set-parameter
> to avoid build failures, but this patch will be reverted with the
> GCC 4.6.1 release, and the severity of the report will be raised.
> 
> The full build log can be found at:
> http://people.debian.org/~doko/tmp/werror/xen_4.1.0-3_lsid64.buildlog
> The last lines of the build log are at the end of this report.
The build error in that log seems to be:
gcc -g -O2 -O2 -fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement  -DNDEBUG
-nostdinc -fno-builtin -fno-common -Wredundant-decls -iwithprefix include
-Werror -Wno-pointer-arith -pipe
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-generic
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -mno-red-zone -fpic
-fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -g -D__XEN__ -MMD
-MF .xen.d -O2 -fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement  -DNDEBUG
-nostdinc -fno-builtin -fno-common -Wredundant-decls -iwithprefix include
-Werror -Wno-pointer-arith -pipe
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-generic
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -mno-red-zone -fpic
-fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -g -D__XEN__ -MMD
-MF .built_in.o.d -O2 -fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99
-Wall -Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement 
-DNDEBUG -nostdinc -fno-builtin -fno-common -Wredundant-decls -iwithprefix
include -Werror -Wno-pointer-arith -pipe
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-generic
-I/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -mno-red-zone -fpic
-fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -g -D__XEN__ -MMD
-MF .io_apic.o.d -c io_apic.c -o io_apic.o
io_apic.c: In function 'restore_IO_APIC_setup':
/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm/io_apic.h:150:26:
error: '*((void *)&entry+4)' may be used uninitialized in this
function [-Werror=uninitialized]
io_apic.c:221:32: note: '*((void *)&entry+4)' was declared here
/build/user-xen_4.1.0-3-amd64-zSon7K/xen-4.1.0/debian/build/build-hypervisor_amd64_amd64/xen/include/asm/io_apic.h:150:26:
error: 'entry' may be used uninitialized in this function
[-Werror=uninitialized]
io_apic.c:221:32: note: 'entry' was declared here
cc1: all warnings being treated as errors

which unless I'm mistaken is unrelated to the unused-but-set-variable or
unused-but-set-parameter warnings (although the warning does seem
valid), is this the right log or am I missing something?

Ian.
-- 
Ian Campbell
Current Noise: Enslaved - Havenless

Inspiration without perspiration is usually sterile.

Your message dated Fri, 17 Feb 2012 10:29:17 +0000
with message-id <1329474557.3131.25.camel at zakaz.uk.xensource.com>
and subject line Fixed in 4.1.1-1
has caused the Debian Bug report #625438,
regarding xen: ftbfs with gcc-4.6 -Werror
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
625438: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=625438
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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