gcc 4.2.1 will delete

[Mori Hiroki]

Hi.

I want try clang on mips. When can use it ?

I think clang is better than external gcc.

Because of ZRouter have build setting for
arm and armv7 by clang already.

Hiroki Mori

----- Original Message -----
>From: Kyle Evans <kevans at freebsd.org>
>To: Warner Losh <imp at bsdimp.com> 
>Cc: Mori Hiroki <yamori813 at yahoo.co.jp>; freebsd-mips at freebsd.org; Ed Maste <emaste at freebsd.org>
>Date: 2019/8/28, Wed 02:18
>Subject: Re: gcc 4.2.1 will delete
> 
>On Tue, Aug 27, 2019 at 11:59 AM Kyle Evans <kevans at freebsd.org> wrote:
>>
>> (CC'ing emaste@ as well, because this is a bit of a status report)
>>
>> On Fri, Aug 23, 2019 at 11:01 PM Warner Losh <imp at bsdimp.com> wrote:
>> >
>> > On Fri, Aug 23, 2019, 9:54 PM Mori Hiroki <yamori813 at yahoo.co.jp> wrote:
>> >
>> > > Hi
>> > >
>> > > gcc 4.2.1 will delete.
>> > >
>> > > How about go mips architecture ?
>> > >
>> > > https://reviews.freebsd.org/rS351429
>> >
>> >
>> > There is good support for an external toolchain today. Clang has some
>> > support, but it works a lot better in llvm 9.0,  which is due in about a
>> > month.
>> >
>> > Warner
>> >
>>
>> I have the following open work for mips32 w/ in-tree llvm (and llvm90
>> has the same issues for some of them):
>> - https://reviews.freebsd.org/D21435 (_mcount needs to be explicitly
>> placed in .text; clang will emit ".section .mdebug.abi32" before
>> everything else so _mcount ends up in it -- I don't think we can
>> really blame clang, we probably should've specified)
>>
>> - https://people.freebsd.org/~kevans/mips-llvm.diff (.eh_frame ends up
>> with some relocations we can't have in non-writable section; dirty
>> dirty hack to make .eh_frame writable in clang and making sure the
>> synthetic section that lld produces is also writable [this part's even
>> dirtier than the first])
>>
>> - https://people.freebsd.org/~kevans/mips-opts.diff (fusefs tests
>> currently hang and I haven't had time to figure out why or try and
>> reproduce it against llvm90; the rest of the diff is simply enabling
>> full LLVM/LLD world)
>>
>> With these three I can make build and install a world w/ MALTA kernel,
>> all otherwise modified, and things generally work except kldxref:
>>
>> Building /boot/kernel/linker.hints
>> kldxref: /boot/kernel/kernel: too many segments
>>
>> root@:~ # uname -a
>> FreeBSD  13.0-CURRENT FreeBSD 13.0-CURRENT #0
>> b101f7f4b1d-c262228(mips-llvm)-dirty: Tue Aug 27 09:42:00 CDT 2019
>> root at viper.audeuro.com:/usr/obj/usr/src/mips-llvm/sys/MALTA  mips
>>
>> Next step, I'll fudge this into freebsd-wifi-build and test it on the
>> hardware in my test lab...
>>
>
>I almost forgot this one:
>
>- https://people.freebsd.org/~kevans/mips-csu.diff
>
>I pulled a .cprestore directive out of thin air because, AFAICT, it
>really doesn't matter. We do similar hijinks in
>^/sys/mips/include/profile.h, apparently, in MCOUNT.
>
>
>