[Qemu-devel] MIPS qemu build failure

[Qemu-devel] MIPS qemu build failure

[Steve Ellcey]

Is anyone else seeing this qemu build failure?  I am building qemu
for MIPS from the top-of-tree sources.

make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
make: *** [subdir-mips-linux-user] Error 2
Error: Make command failed, stopping build.



Steve Ellcey
sellcey@imgtec.com

Re: [Qemu-devel] MIPS qemu build failure

[Steve Ellcey]

Following up to my own email.  Apparently the reason I get this error is
that I am building with "--disable-tools --disable-system".  I don't need
the tools and I don't have pixman on my build system so if I don't use
"--disable-tools --disable-system" I get an error about not having pixman
installed.

When I do use "--disable-tools --disable-system" on the configure line I get:

make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
make: *** [subdir-mips-linux-user] Error 2
Error: Make command failed, stopping build.


It was pointed out to me that 'configure --help' does not list the 
--disable-tools option as a supported option but inside the configure
script I see this code, so it seems --disable-tools is supposed to
be supported.

  if test "$pixman" = "none"; then
    if test "$want_tools" != "no" -o "$softmmu" != "no"; then
      error_exit "pixman disabled but system emulation or tools build" \
          "enabled.  You can turn off pixman only if you also" \
          "disable all system emulation targets and the tools" \
          "build with '--disable-tools --disable-system'."
    fi


Steve Ellcey
sellcey@imgtec.com

Re: [Qemu-devel] MIPS qemu build failure

[Peter Maydell]

On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
>
> Following up to my own email.  Apparently the reason I get this error is
> that I am building with "--disable-tools --disable-system".  I don't need
> the tools and I don't have pixman on my build system so if I don't use
> "--disable-tools --disable-system" I get an error about not having pixman
> installed.

We ship pixman as a git submodule so that you don't have to have
a system pixman, though the configure options you're using should work.

> When I do use "--disable-tools --disable-system" on the configure line I get:
>
> make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
> make: *** [subdir-mips-linux-user] Error 2
> Error: Make command failed, stopping build.

Daniel, this sounds like more fallout from your recent changes?

> It was pointed out to me that 'configure --help' does not list the
> --disable-tools option as a supported option but inside the configure
> script I see this code, so it seems --disable-tools is supposed to
> be supported.
>
>   if test "$pixman" = "none"; then
>     if test "$want_tools" != "no" -o "$softmmu" != "no"; then
>       error_exit "pixman disabled but system emulation or tools build" \
>           "enabled.  You can turn off pixman only if you also" \
>           "disable all system emulation targets and the tools" \
>           "build with '--disable-tools --disable-system'."
>     fi
>

Yes, --disable-tools is a valid and supported command line option.
It's a bug that it's not listed in the --help output's list of valid
enable/disable flags.

thanks
-- PMM

Re: [Qemu-devel] MIPS qemu build failure

[Daniel P. Berrange]

On Thu, Sep 17, 2015 at 07:38:53PM +0100, Peter Maydell wrote:
> On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
> >
> > Following up to my own email.  Apparently the reason I get this error is
> > that I am building with "--disable-tools --disable-system".  I don't need
> > the tools and I don't have pixman on my build system so if I don't use
> > "--disable-tools --disable-system" I get an error about not having pixman
> > installed.
> 
> We ship pixman as a git submodule so that you don't have to have
> a system pixman, though the configure options you're using should work.
> 
> > When I do use "--disable-tools --disable-system" on the configure line I get:
> >
> > make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
> > make: *** [subdir-mips-linux-user] Error 2
> > Error: Make command failed, stopping build.
> 
> Daniel, this sounds like more fallout from your recent changes?

I've just tried './configure --enable-tools --disable-system && make' and
got a successful build, including the qemu-mips binary, so I wonder if
there's some stale build artifacts, or other configure CLI args

Steve, were there any other flags you passed to configure besides these
two ?  Also can you confirm you tested with a completely clean build
env. ie after  "git clean -f -d -x" to purge all build artifacts.

If you can still reproduce from a completely clean checkout, can you
provide a copy of the full output of running configure, so I can see
if there's any other options that are different from my testing env.

Regards,
Daniel
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Re: [Qemu-devel] MIPS qemu build failure

[Leon Alrae]

On 18/09/2015 09:24, Daniel P. Berrange wrote:
> On Thu, Sep 17, 2015 at 07:38:53PM +0100, Peter Maydell wrote:
>> On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
>>>
>>> Following up to my own email.  Apparently the reason I get this error is
>>> that I am building with "--disable-tools --disable-system".  I don't need
>>> the tools and I don't have pixman on my build system so if I don't use
>>> "--disable-tools --disable-system" I get an error about not having pixman
>>> installed.
>>
>> We ship pixman as a git submodule so that you don't have to have
>> a system pixman, though the configure options you're using should work.
>>
>>> When I do use "--disable-tools --disable-system" on the configure line I get:
>>>
>>> make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
>>> make: *** [subdir-mips-linux-user] Error 2
>>> Error: Make command failed, stopping build.
>>
>> Daniel, this sounds like more fallout from your recent changes?
> 
> I've just tried './configure --enable-tools --disable-system && make' and
> got a successful build, including the qemu-mips binary, so I wonder if
> there's some stale build artifacts, or other configure CLI args

Note that Steve used --disable-tools, not enable. I just tried and it fails
also for me:

$ ../qemu/configure --disable-tools --disable-system && make
(...)
make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-aarch64'. Stop.
make: *** [subdir-aarch64-linux-user] Error 2

Thanks,
Leon

Re: [Qemu-devel] MIPS qemu build failure

[Daniel P. Berrange]

On Fri, Sep 18, 2015 at 09:53:31AM +0100, Leon Alrae wrote:
> On 18/09/2015 09:24, Daniel P. Berrange wrote:
> > On Thu, Sep 17, 2015 at 07:38:53PM +0100, Peter Maydell wrote:
> >> On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
> >>>
> >>> Following up to my own email.  Apparently the reason I get this error is
> >>> that I am building with "--disable-tools --disable-system".  I don't need
> >>> the tools and I don't have pixman on my build system so if I don't use
> >>> "--disable-tools --disable-system" I get an error about not having pixman
> >>> installed.
> >>
> >> We ship pixman as a git submodule so that you don't have to have
> >> a system pixman, though the configure options you're using should work.
> >>
> >>> When I do use "--disable-tools --disable-system" on the configure line I get:
> >>>
> >>> make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-mips'.  Stop.
> >>> make: *** [subdir-mips-linux-user] Error 2
> >>> Error: Make command failed, stopping build.
> >>
> >> Daniel, this sounds like more fallout from your recent changes?
> > 
> > I've just tried './configure --enable-tools --disable-system && make' and
> > got a successful build, including the qemu-mips binary, so I wonder if
> > there's some stale build artifacts, or other configure CLI args
> 
> Note that Steve used --disable-tools, not enable. I just tried and it fails
> also for me:

Opps, when I tested, I *did* in fact use --disable-tools - just my email
here was wrong.

> $ ../qemu/configure --disable-tools --disable-system && make
> (...)
> make[1]: *** No rule to make target `../qom/object.o', needed by `qemu-aarch64'. Stop.
> make: *** [subdir-aarch64-linux-user] Error 2

Ahh, this is useful.

You have your build directory *outside* the QEMU source tree,
eg $GIT/../build, whereas I had been testing with $GIT/build
and an non-VPATH build.

I can in fact reproduce if building completely outside the GIT tree
like you show.

I'll look at producing a fix shortly...

Regards,
Daniel
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[Qemu-devel] Someone kill the in-tree build, please (was: MIPS qemu build failure)

[Markus Armbruster]

"Daniel P. Berrange" <berrange@redhat.com> writes:

> On Fri, Sep 18, 2015 at 09:53:31AM +0100, Leon Alrae wrote:
>> On 18/09/2015 09:24, Daniel P. Berrange wrote:
>> > On Thu, Sep 17, 2015 at 07:38:53PM +0100, Peter Maydell wrote:
>> >> On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
>> >>>
>> >>> Following up to my own email.  Apparently the reason I get this error is
>> >>> that I am building with "--disable-tools --disable-system".  I don't need
>> >>> the tools and I don't have pixman on my build system so if I don't use
>> >>> "--disable-tools --disable-system" I get an error about not having pixman
>> >>> installed.
>> >>
>> >> We ship pixman as a git submodule so that you don't have to have
>> >> a system pixman, though the configure options you're using should work.
>> >>
>> >>> When I do use "--disable-tools --disable-system" on the
>> >>> configure line I get:
>> >>>
>> >>> make[1]: *** No rule to make target `../qom/object.o', needed by
>> >>> `qemu-mips'.  Stop.
>> >>> make: *** [subdir-mips-linux-user] Error 2
>> >>> Error: Make command failed, stopping build.
>> >>
>> >> Daniel, this sounds like more fallout from your recent changes?
>> > 
>> > I've just tried './configure --enable-tools --disable-system && make' and
>> > got a successful build, including the qemu-mips binary, so I wonder if
>> > there's some stale build artifacts, or other configure CLI args
>> 
>> Note that Steve used --disable-tools, not enable. I just tried and it fails
>> also for me:
>
> Opps, when I tested, I *did* in fact use --disable-tools - just my email
> here was wrong.
>
>> $ ../qemu/configure --disable-tools --disable-system && make
>> (...)
>> make[1]: *** No rule to make target `../qom/object.o', needed by
>> `qemu-aarch64'. Stop.
>> make: *** [subdir-aarch64-linux-user] Error 2
>
> Ahh, this is useful.
>
> You have your build directory *outside* the QEMU source tree,
> eg $GIT/../build, whereas I had been testing with $GIT/build
> and an non-VPATH build.
>
> I can in fact reproduce if building completely outside the GIT tree
> like you show.
>
> I'll look at producing a fix shortly...

Dropping the in-tree build entirely would save us from such unnecessary
build breakages.  Unfortunately, I haven't been able to find the time to
write a patch.  Any takers?

Re: [Qemu-devel] Someone kill the in-tree build, please (was: MIPS qemu build failure)

[Peter Maydell]

On 18 September 2015 at 13:06, Markus Armbruster <armbru@redhat.com> wrote:
> "Daniel P. Berrange" <berrange@redhat.com> writes:
>> You have your build directory *outside* the QEMU source tree,
>> eg $GIT/../build, whereas I had been testing with $GIT/build
>> and an non-VPATH build.

> Dropping the in-tree build entirely would save us from such unnecessary
> build breakages.

No it wouldn't, because neither "build in $GIT/build" nor
"build in ../build" are in-tree build configs (which would
be "build in $GIT" and which I agree we don't really want to
encourage).

thanks
-- PMM

Re: [Qemu-devel] Someone kill the in-tree build, please (was: MIPS qemu build failure)

[Daniel P. Berrange]

On Fri, Sep 18, 2015 at 02:06:39PM +0200, Markus Armbruster wrote:
> "Daniel P. Berrange" <berrange@redhat.com> writes:
> 
> > On Fri, Sep 18, 2015 at 09:53:31AM +0100, Leon Alrae wrote:
> >> On 18/09/2015 09:24, Daniel P. Berrange wrote:
> >> > On Thu, Sep 17, 2015 at 07:38:53PM +0100, Peter Maydell wrote:
> >> >> On 17 September 2015 at 19:21, Steve Ellcey <sellcey@imgtec.com> wrote:
> >> >>>
> >> >>> Following up to my own email.  Apparently the reason I get this error is
> >> >>> that I am building with "--disable-tools --disable-system".  I don't need
> >> >>> the tools and I don't have pixman on my build system so if I don't use
> >> >>> "--disable-tools --disable-system" I get an error about not having pixman
> >> >>> installed.
> >> >>
> >> >> We ship pixman as a git submodule so that you don't have to have
> >> >> a system pixman, though the configure options you're using should work.
> >> >>
> >> >>> When I do use "--disable-tools --disable-system" on the
> >> >>> configure line I get:
> >> >>>
> >> >>> make[1]: *** No rule to make target `../qom/object.o', needed by
> >> >>> `qemu-mips'.  Stop.
> >> >>> make: *** [subdir-mips-linux-user] Error 2
> >> >>> Error: Make command failed, stopping build.
> >> >>
> >> >> Daniel, this sounds like more fallout from your recent changes?
> >> > 
> >> > I've just tried './configure --enable-tools --disable-system && make' and
> >> > got a successful build, including the qemu-mips binary, so I wonder if
> >> > there's some stale build artifacts, or other configure CLI args
> >> 
> >> Note that Steve used --disable-tools, not enable. I just tried and it fails
> >> also for me:
> >
> > Opps, when I tested, I *did* in fact use --disable-tools - just my email
> > here was wrong.
> >
> >> $ ../qemu/configure --disable-tools --disable-system && make
> >> (...)
> >> make[1]: *** No rule to make target `../qom/object.o', needed by
> >> `qemu-aarch64'. Stop.
> >> make: *** [subdir-aarch64-linux-user] Error 2
> >
> > Ahh, this is useful.
> >
> > You have your build directory *outside* the QEMU source tree,
> > eg $GIT/../build, whereas I had been testing with $GIT/build
> > and an non-VPATH build.
> >
> > I can in fact reproduce if building completely outside the GIT tree
> > like you show.
> >
> > I'll look at producing a fix shortly...
> 
> Dropping the in-tree build entirely would save us from such unnecessary
> build breakages.  Unfortunately, I haven't been able to find the time to
> write a patch.  Any takers?

Preventing non-VPATH builds wouldn't have avoided the breakage in this
case, as it only occurred when multiple criteria were met. You needed
to have done a build with certain features disabled *and* done it
in a VPATH *and* for VPATH to have lived outside your $GIT checkout.
We'd only catch that if we added more combinations to the build checks
Peter does prior to merge.

I could see an argument for dropping non-VPATH builds, even though I do
typically use them myself, since VPATH vs non-VPATH is a constant source
of trouble in most projects. I don't think its so reasonable to dictate
to people /where/ they put their VPATHs - IMHO its acceptable to use
$GIT/build as a VPATH.

Regards,
Daniel
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