From: Andrea Corallo <andrea.corallo@arm.com>
To: Daurnimator <quae@daurnimator.com>
Cc: David Malcolm <dmalcolm@redhat.com>, jit@gcc.gnu.org
Subject: Re: libgccjit questions
Date: Wed, 09 Sep 2020 10:18:41 +0200 [thread overview]
Message-ID: <gkrr1rbz7ku.fsf@arm.com> (raw)
In-Reply-To: <CAEnbY+cxMW3JjE7Av-sMQS8wLGOPQdcvFrtj3etXkXYdr0+2sw@mail.gmail.com> (Daurnimator's message of "Wed, 9 Sep 2020 12:50:42 +1000")
Daurnimator <quae@daurnimator.com> writes:
> Hi,
Hi!
> I'm looking into using libgccjit as an ahead-of-time compiler to write
> a backend for zig (https://ziglang.org/)
> I've got a few questions I hope you can answer:
>
> What became of cross-compilation? I saw it mentioned as a possible
> roadmap item in
> https://gcc.gnu.org/legacy-ml/jit/2015-q3/msg00086.html)
AFAIK cross compilation is not supported and nothing is going on in that
sense. I believe this is in line with the idea of libgccjit being
mainly intended for making jitters.
> How can I support inline assembly?
I believe you cannot use inline assembly as we have no specific support
for that and asm and __asm__ are not builtin functions so they can't be
used with gcc_jit_context_get_builtin_function.
> Would it be reasonable to add an API that allows extracting sections
> without writing out to a file and reading it back in?
The elf file is always produced because the assembler is invoked as a
child process, so as of today this cannot happen in memory.
> Alteratively, would it be possible to get a pointer and length to e.g.
> an ELF in memory?
>
> Should distros be packaging libgccjit?
> I noticed that e.g. ArchLinux is not. Possibly because it is
> documented as "experimental"; possibly because it requires building
> gcc with --enable-host-shared ?
Most distros are already packing libgccjit, even if the quality of the
package may vary.
> What is the license situation with libgccjit; is it GPL? LGPL? what
> does this mean for code that uses libgccjit?
AFAIU libgccjit is part of GCC and this is released under the GNU
General Public License.
> Thanks,
> Daurnimator
Bests
Andrea
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next prev parent reply other threads:[~2020-09-09 8:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-09 2:50 Daurnimator
2020-09-09 8:18 ` Andrea Corallo [this message]
2020-09-10 22:50 ` David Malcolm
2020-09-11 2:42 ` Daurnimator
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