From: "Alex Bennée" <alex.bennee@linaro.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: wilde@sha-bang.de, emacs-devel@gnu.org, akrl@sdf.org
Subject: Re: Getting ready to land native-compilation on master
Date: Wed, 14 Apr 2021 18:28:49 +0100 [thread overview]
Message-ID: <87lf9klqmn.fsf@linaro.org> (raw)
In-Reply-To: <83czuwzto3.fsf@gnu.org>
Eli Zaretskii <eliz@gnu.org> writes:
>> From: wilde@sha-bang.de
>> Cc: emacs-devel@gnu.org, Andrea Corallo <akrl@sdf.org>
>> Date: Wed, 14 Apr 2021 17:53:33 +0200
>>
>> Today I build and started using Emacs from the on a small i368 system
>> with NetBSD 9.1:
>>
>> System spec:
>> CPU: Intel(R) Atom(TM) CPU N270 @ 1.60GHz
>> RAM: 2 GiB
>>
>> Build:
>> - I build libgccjit from gcc 10.2.0 manually as libgccjit seems not to
>> be available from pkgsrc (not checked very thoroughly though) at least
>> I found no `pkgin' installable binaries...
>>
>> - I had to manually remove `-ldl' from LIBGCCJIT in src/Makefile as this
>> is not needed on *BSD (and triggers an error during build, when
>> present)
>
> Andrea, looks like NetBSD is in the same boat as OpenBSD, where we
> already refrain from using -ldl.
>
>> - I hat to disable memory protection on the system to make the native
>> compiler work:
>> sysctl -w security.pax.mprotect.global=0
>> sysctl -w security.pax.mprotect.enabled=0
>> This is not a Emacs specific problem but a problem with libgccjit
>> itself. (The basic gcc jit "Hello World" example also fails with
>> memory protection in place).
>
> I'm not sure I understand why this happens, but I think this issue
> should be reported to the GCC Bugzilla.
I suspect this is a change similar to the recent MacOS one where
eXecutable pages cannot be mapped as Writable. The QEMU project recently
had to implement split mappings for it's JIT to workaround this although
I dare say there is probably a JIT interface that should be used to give
suitable access to pages but that is something for the BSD experts to
chime in on.
--
Alex Bennée
next prev parent reply other threads:[~2021-04-14 17:28 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 14:02 Getting ready to land native-compilation on master Eli Zaretskii
2021-04-09 14:27 ` tomas
2021-04-09 14:33 ` Stefan Kangas
2021-04-09 14:39 ` T.V Raman
2021-04-09 16:17 ` Pip Cet
2021-04-09 16:35 ` Thierry Volpiatto
2021-04-09 18:57 ` Eli Zaretskii
2021-04-10 5:39 ` Thierry Volpiatto
2021-04-09 17:12 ` Jens C. Jensen
2021-04-09 18:53 ` Stefan Monnier
2021-04-09 18:59 ` Jens C. Jensen
2021-04-09 22:43 ` Stefan Monnier
2021-04-10 8:45 ` Jens C. Jensen
2021-04-10 13:10 ` Stefan Monnier
2021-04-09 19:08 ` Andrea Corallo via Emacs development discussions.
2021-04-09 19:14 ` Eli Zaretskii
2021-04-10 0:07 ` Andy Moreton
2021-04-10 7:23 ` Eli Zaretskii
2021-04-10 11:40 ` Andy Moreton
2021-04-09 18:09 ` Sujith Manoharan
2021-04-09 18:50 ` Eli Zaretskii
2021-04-09 18:27 ` Alex Bennée
2021-04-09 18:48 ` Andrea Corallo via Emacs development discussions.
2021-04-14 4:39 ` Pankaj Jangid
2021-04-14 6:31 ` Eli Zaretskii
2021-04-14 9:45 ` Philip Kaludercic
2021-04-14 10:14 ` Andrea Corallo via Emacs development discussions.
2021-04-14 10:35 ` Philip Kaludercic
2021-04-14 10:45 ` Eli Zaretskii
2021-04-14 10:49 ` Eli Zaretskii
2021-04-14 12:57 ` Philip Kaludercic
2021-04-14 13:10 ` Eli Zaretskii
2021-04-14 14:00 ` Philip Kaludercic
2021-04-14 14:35 ` Stefan Kangas
2021-04-14 14:42 ` Philip Kaludercic
2021-04-14 14:50 ` Stefan Monnier
2021-04-14 15:02 ` Eli Zaretskii
2021-04-14 14:37 ` Eli Zaretskii
2021-04-14 14:48 ` Dmitry Gutov
2021-04-14 17:10 ` Eli Zaretskii
2021-04-14 10:48 ` Andrea Corallo via Emacs development discussions.
2021-04-14 15:53 ` wilde
2021-04-14 17:02 ` Eli Zaretskii
2021-04-14 17:28 ` Alex Bennée [this message]
2021-04-14 17:41 ` Eli Zaretskii
2021-04-15 11:15 ` Alex Bennée
2021-04-14 18:07 ` Andrea Corallo via Emacs development discussions.
2021-04-14 20:23 ` Stefan Kangas
2021-04-14 22:01 ` Andrea Corallo via Emacs development discussions.
2021-04-15 9:25 ` wilde
2021-04-15 11:19 ` wilde
2021-04-15 16:23 ` Andrea Corallo via Emacs development discussions.
2021-04-27 16:25 ` wilde
2021-04-28 3:06 ` Corwin Brust
2021-04-28 17:52 ` Jose E. Marchesi
2021-04-29 8:20 ` Arthur Miller
2021-04-22 10:09 ` wilde
2021-04-22 11:14 ` Eli Zaretskii
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