Re: Getting ready to land native-compilation on master

[Eli Zaretskii <eliz@gnu.org>]

> 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.

> The native compiling Emacs itself seems to run fine (I'm right now
> writing this message in gnus on the said system) and the performance
> improvement is very noticeable on this small system.  Thanks a LOT to
> Andrea for this major improvement of GNU Emacs!

Thanks for testing the branch.