Re: [Xen-devel] 4.9rc4: Cannot build with higher than -j4 - was: linux.c:27:28: fatal error: xen/sys/evtchn.h: No such file or directory

[Julien Grall <julien.grall@xxxxxxx>]

Hi George,

CC Ian and Wei for feedback on the error.

On 15/05/17 14:04, George Dunlap wrote:
> On Sun, May 14, 2017 at 10:50 AM, Steven Haigh <netwiz@xxxxxxxxx> wrote:
> > On 10/05/17 23:02, Steven Haigh wrote:
> > > On 10/05/17 01:20, M A Young wrote:
> > > > On Tue, 9 May 2017, Steven Haigh wrote:
> > > >
> > > > > I'm trying to use the same build procedure I had for working correctly
> > > > > for Xen 4.7 & 4.8.1 - but am coming across this error:
> > > > >
> > > > > gcc  -DPIC -m64 -DBUILD_ID -fno-strict-aliasing -std=gnu99 -Wall
> > > > > -Wstrict-prototypes -Wdeclaration-after-statement
> > > > > -Wno-unused-but-set-variable -Wno-unused-local-typedefs   -g3 -O0
> > > > > -fno-omit-frame-pointer -D__XEN_INTERFACE_VERSION__=__XE
> > > > > N_LATEST_INTERFACE_VERSION__ -MMD -MF .linux.opic.d -D_LARGEFILE_SOURCE
> > > > > -D_LARGEFILE64_SOURCE   -Werror -Wmissing-prototypes -I./include
> > > > > -I/builddir/build/BUILD/xen-4.9.0-rc4/tools/libs/evtchn/../../../tools/include
> > > > > -I/builddir/build/BUI
> > > > > LD/xen-4.9.0-rc4/tools/libs/evtchn/../../../tools/libs/toollog/include
> > > > > -I/builddir/build/BUILD/xen-4.9.0-rc4/tools/libs/evtchn/../../../tools/include
> > > > >  -fPIC -c -o linux.opic linux.c
> > > > > mv headers.chk.new headers.chk
> > > > > linux.c:27:28: fatal error: xen/sys/evtchn.h: No such file or directory
> > > > >  #include <xen/sys/evtchn.h>
> > > > >                             ^
> > > > > compilation terminated.
> > > > > linux.c:27:28: fatal error: xen/sys/evtchn.h: No such file or directory
> > > > >  #include <xen/sys/evtchn.h>
> > > > >                             ^
> > > > > compilation terminated.
> > > > >
> > > > > Any clues as to what to start pulling apart that changed between 4.8.1
> > > > > and 4.9.0-rc4 that could cause this?
> > > > It worked for me in a test build, eg. see one of the builds at
> > > > https://copr.fedorainfracloud.org/coprs/myoung/xentest/build/549124/
> > > Ok, after lots of debugging, when I run 'make dist', I usually use the
> > > macro for smp building, so I end up with:
> > >       make %{?_smp_mflags} dist
> > >
> > > It seems this is hit and miss as to it actually working.
> > >
> > > I have had a 100% success rate (but slow builds) with:
> > >       make dist
> > >
> > > Trying with 'make -j4 dist' seems to work the couple of times I've tried it.
> > >
> > > This seems to be a new problem that I haven't come across before in 4.4,
> > > 4.5, 4.6, 4.7 or my initial 4.8.1 builds - so its new to 4.9.0 rc's.
> > >
> > > The consensus on #xen seems to be that there is a race between libs &
> > > include - and that these are supposed to be built in sequence and not
> > > parallel.
> > >
> > > I'm a little over my depth now - as I assume this heads into Makefile land.
> > >
> > > If it helps, there is a full build log available at:
> > >       https://cloud.crc.id.au/index.php/s/iTWJE3A1TQBhgDq
> > >
> > > I've committed my current progress in my git tree:
> > >       https://xen.crc.id.au/git/?p=xen49;a=tree
> > >
> > > Right now, we're looking at lines 304 / 305 of SPECS/xen49.spec
> > Just wanted to give this a nudge. It seems if you build with above -j4
> > (on a machine with suitable number of cores), the build will fail. This
> > is a degradation from any version previous to 4.9.
> Julien,
>
> Probably something we should put on your list as a release blocker.
I think you are right. Added in the list.

Cheers,

--
Julien Grall

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