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Date:      Sat, 11 Aug 2018 19:01:13 +0000
From:      Mark Millard <mark.millard@nexustechnology.com>
To:        Warner Losh <imp@bsdimp.com>
Cc:        Dimitry Andric <dim@FreeBSD.org>, "freebsd-toolchain@FreeBSD.org" <freebsd-toolchain@freebsd.org>
Subject:   Re: Broken arm support in clang now?
Message-ID:  <8B467E75-A6D3-41A5-8EA1-4DDFE0E14CC5@nexustechnology.com>
In-Reply-To: <A5B46840-B508-4F40-9EFD-50D0439EBAC7@FreeBSD.org>
References:  <CANCZdfpmDN-nAkViuEx-tKpPhOdRYX=xNu6s8E2o6F4xC2WPnA@mail.gmail.com> <1880880F-9D9D-47E0-A7A4-5369A3770F89@FreeBSD.org> <CANCZdfpF9ND_k2xvZrsDebsZ07p2RU0Lebp5GDtmxnjdXc=N-A@mail.gmail.com> <A5B46840-B508-4F40-9EFD-50D0439EBAC7@FreeBSD.org>
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[-- Attachment #1 --]
On 2018-Aug-11, at 11:09 AM, Dimitry Andric <dim at FreeBSD.org> wrote:
> 
> On 11 Aug 2018, at 19:31, Warner Losh <imp at bsdimp.com> wrote:
>> 
>> On Sat, Aug 11, 2018, 10:20 AM Dimitry Andric <dim@freebsd.org> wrote:
>> On 11 Aug 2018, at 16:55, Warner Losh <imp@bsdimp.com> wrote:
>>> 
>>> It looks like armv5 clang bogusly uses lld:
>>> 
>>> From a 'make buildkernel' of the RT1310 kernel config:
>>> 
>>> cc -target arm-gnueabi-freebsd12.0
> ...
>>> ld: warning: lld uses extended branch encoding, no object with architecture
>>> supporting feature detected.
>>> ld: warning: lld may use movt/movw, no object with architecture supporting
>>> feature detected.
> ...

Did the build get either of the below notices? Both?

make[1]: "/usr/src/Makefile.inc1" line 341: SYSTEM_COMPILER: Determined that CC=cc matches the source tree.  Not bootstrapping a cross-compiler.
make[1]: "/usr/src/Makefile.inc1" line 346: SYSTEM_LINKER: Determined that LD=ld matches the source tree.  Not bootstrapping a cross-linker.

?

(The example text was taken from an amd64 -> aarch64 cross build.)

>> Host is amd64. Target is arm. No src.conf. Did a full buildworld TARGET=arm a few days ago. /usr/bin/ld is lld.
> 
> Okay, so in the above "cc" command, can you somehow figure out which cc
> executable it is using? And please add a -v to the "linking kernel.full"
> command line, so it shows exactly which linker it runs?
> 
> I have the idea that it is preferring your /usr/bin/ld over
> ${WORLDTMP}/usr/bin/ld...



===

Mark Millard
Nexus Technology, Inc. 
78 Northeastern Blvd., Unit #2 
Nashua  NH  03062

877-595-8116  x821

mark.millard@nexustechnology.com


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