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

[Steven Haigh <netwiz@xxxxxxxxx>]

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.

-- 
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

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