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

[George Dunlap <dunlapg@xxxxxxxxx>]

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.

 -George

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