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Date:      Sat, 17 Oct 2015 08:57:15 -0700
From:      Bryan Drewery <bdrewery@FreeBSD.org>
To:        NGie Cooper <yaneurabeya@gmail.com>
Cc:        jenkins-admin@FreeBSD.org, ngie@FreeBSD.org, freebsd-current@FreeBSD.org
Subject:   Re: FreeBSD_HEAD_amd64_gcc4.9 - Build #673 - Failure
Message-ID:  <56226FDB.70800@FreeBSD.org>
In-Reply-To: <78883694-7B54-4AC3-9B5B-D715D5DA1F88@gmail.com>
References:  <1743862498.27.1445058611319.JavaMail.jenkins@jenkins-9.freebsd.org> <5621D9F1.9080707@FreeBSD.org> <5621DDB1.8020807@FreeBSD.org> <31F4FEC4-B677-4EA1-BD67-F2DC458A99E4@gmail.com> <2B9A4B89-6D0D-4549-B249-FB30A8117DDF@gmail.com> <78883694-7B54-4AC3-9B5B-D715D5DA1F88@gmail.com>

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On 10/17/2015 12:09 AM, NGie Cooper wrote:
>=20
>> On Oct 16, 2015, at 23:38, NGie Cooper <yaneurabeya@gmail.com> wrote:
>>
>>> On Oct 16, 2015, at 23:26, NGie Cooper <yaneurabeya@gmail.com> wrote:=

>>>
>>>> On Oct 16, 2015, at 22:33, Bryan Drewery <bdrewery@FreeBSD.org> wrot=
e:
>>>
>>> ...
>>>
>>>>> I don't see how these changes cause this and I'm unable to reproduc=
e
>>>>> here.  Is anyone else hitting this?
>>>>>
>>>>
>>>> https://jenkins.freebsd.org/job/FreeBSD_HEAD_sparc64/lastBuild/conso=
leText
>>>>
>>>> The sparc64 build is past this. I don't think it was due to my chang=
es,
>>>> which were largely a NOP.

Woops, that does not use clang :)

>>>>
>>>> I'm going to bed now, will look more tomorrow.
>>>
>>> I just hit it on my 10.2-RELEASE host with dual-SSDs and gobs of RAM.=
 It=92s a race somewhere in the clang build=85 just not sure where yet.
>>> Thanks,
>>> -NGie
>>>
>>> --- arm_neon.h ---
>>> clang-tblgen -gen-arm-neon  -d arm_neon.d -o arm_neon.h  /home/ngie/g=
it/freebsd/src/lib/clang/include/../../../contrib/llvm/tools/clang/includ=
e/clang/Basic/arm_neon.td
>>> /home/ngie/git/freebsd/src/lib/clang/include/../../../contrib/llvm/to=
ols/clang/include/clang/Basic/arm_neon.td:701:1: error: Record `VMOVL' do=
es not have a field named `Operand'!
>>>
>>> def VMOVL        : SInst<"vmovl", "wd",  "csiUcUsUi">;
>>>
>>> *** [arm_neon.h] Error code 1
>>
>> And=85 FWIW I=92m not sure your last set of changes caused this. Needs=
 more investigation.
>> Thanks!
>> -NGie
>=20
> Hmm=85 it=92s the only generated header:
>=20
> 67 GENINCS=3D arm_neon.h
> 68 CLEANFILES=3D ${GENINCS} ${GENINCS:C/\.h$/.d/}
>=20
> Well, lookie here:
>=20
> $ make clean
> rm -f arm_neon.h arm_neon.d
> $ make arm_neon.h
> clang-tblgen -gen-arm-neon  -d arm_neon.d -o arm_neon.h  /home/ngie/git=
/freebsd/src/lib/clang/include/../../../contrib/llvm/tools/clang/include/=
clang/Basic/arm_neon.td
> /home/ngie/git/freebsd/src/lib/clang/include/../../../contrib/llvm/tool=
s/clang/include/clang/Basic/arm_neon.td:701:1: error: Record `VMOVL' does=
 not have a field named `Operand'!
>=20
> def VMOVL        : SInst<"vmovl", "wd",  "csiUcUsUi">;
> ^
> *** Error code 1
>=20
> Stop.
> make: stopped in /home/ngie/git/freebsd/src/lib/clang/include
>=20
> The important thing to note is the Jenkins servers are running stable/1=
0 code too (IIRC), so it might be a mismatch in the tools.
>=20

It's actually 10.1-RELEASE.

> Also, this logic looks troublesome:
>=20
>  42 .if empty(TOOLSDIR) || !exists(${TOOLSDIR}/usr/bin/clang-tblgen)
>  43 .if ${MACHINE} =3D=3D "host" && defined(BOOTSTRAPPING_TOOLS)
>  44 .if !empty(LEGACY_TOOLS) && exists(${LEGACY_TOOLS}/usr/bin/tblgen)
>  45 TOOLSDIR=3D ${LEGACY_TOOLS}
>  46 .endif
>  47 .endif
>  48 .if ${MK_STAGING} =3D=3D "yes" && exists(${STAGE_HOST_OBJTOP:Uno}/u=
sr/bin/tblgen)
>  49 TOOLSDIR=3D ${STAGE_HOST_OBJTOP}
>  50 .endif
>  51 .if exists(${LEGACY_TOOLS:Uno}/usr/bin/tblgen)
>  52 TOOLSDIR=3D ${LEGACY_TOOLS}
>  53 .endif
>  54 .endif
>  55 TOOLSDIR?=3D
>  56 .if !empty(TOOLSDIR) && exists(${TOOLSDIR}/usr/bin/clang-tblgen)
>  57 TBLGEN=3D ${TOOLSDIR}/usr/bin/tblgen
>  58 CLANG_TBLGEN=3D ${TOOLSDIR}/usr/bin/clang-tblgen
>  59 .endif
>  60 TBLGEN?=3D        tblgen
>  61 CLANG_TBLGEN?=3D  clang-tblgen
>=20
> This kind of complexity matched something that I simplified at $work du=
e to build races=85
>=20

None of this is used outside of META_MODE though. TOOLSDIR and
LEGACY_TOOLS and MK_STAGING will all be empty or "no" here. There was a
bug in some meta-mode-only code that didn't handle an empty TOOLSDIR
properly, but all of these cases do. The only possible bad case I see is
the LEGACY_TOOLS:Uno, if somehow that feature didn't work right on
10.1's bmake but I really doubt that.

I've conditionalized the whole block on MK_META_MODE now anyhow.

> Guess what happens when I use a proper clang-tblgen?
>=20
> $ make all
> /usr/obj/home/ngie/git/freebsd/src/usr.bin/clang/clang-tblgen/clang-tbl=
gen -gen-arm-neon  -d arm_neon.d -o arm_neon.h  /home/ngie/git/freebsd/sr=
c/lib/clang/include/../../../contrib/llvm/tools/clang/include/clang/Basic=
/arm_neon.td
> $
>=20
> Voila.
>=20
> So this is happening because it=92s using clang-tblgen from the build h=
ost somehow, which is not able to process the .td files.
>=20

Perhaps PATH got set wrong somehow. Note that the build log does not
have an absolute path for clang-tblgen, as the above code would cause.
It is just using the default PATH as other builds do.

There seems to be more going on here. After a clean buildworld, doing a
-DNO_CLEAN incremental results in this file being regenerated. Doing a
2nd -DNO_CLEAN (hitting ctrl+t soon after this file is generated) does
not regenerate it again. Something is making it stale during the build.


--=20
Regards,
Bryan Drewery


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