Date: Tue, 13 Jun 2023 01:19:13 -0700 From: Mark Millard <marklmi@yahoo.com> To: Robert Clausecker <fuz@fuz.su> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Status for armv7 vs. rust (and go)? Message-ID: <E1CFD3CF-5611-4CDB-838A-B2D7FCC88807@yahoo.com> In-Reply-To: <ZG6Y1sbnKQZOEAkg@fuz.su> References: <56FBE30B-41B9-4FBE-AA37-F041946855EC.ref@yahoo.com> <56FBE30B-41B9-4FBE-AA37-F041946855EC@yahoo.com> <ZG6Y1sbnKQZOEAkg@fuz.su>
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On May 24, 2023, at 16:08, Robert Clausecker <fuz@fuz.su> wrote:
> Hi Mark,
Hello.
> Am Wed, May 24, 2023 at 12:52:26PM -0700 schrieb Mark Millard:
>> May be things build but there are operational problems?
>>
>> Anyway, I'd be interested to learn of whatever types of
>> armv7 problems rust may be currently having. (Rust being
>> a large build is a known issue.)
>
> The main problem with Rust ports on armv7 is that many of them have
> LLVM run into address space exhaustions, probably due to trying to
> build programs with LTO. It's hard to diagnose these issues.
>
> There are also a number of recurring portability problems due to
> time_t not being a long on armv7, but these are easy to patch.
I had forgotten, but on the HoneyComb (16 Cortex-A72 cores) I
have in its /usr/local/etc/poudriere.d/main-CA7-make.conf :
. . .
.if ${.CURDIR:M*/lang/*rust*}
MAKE_JOBS_NUMBER=8
.elif . . .
. . .
If I remember right, too many parallel jobs lead to hitting
a process size limit that stopped the build. I've not
experimented with between 8 and 16 (non-inclusive). With 8
I just had 1.70 build:
[00:00:14] [01] [00:00:00] Building lang/rust | rust-1.70.0
[02:16:24] [01] [02:16:10] Finished lang/rust | rust-1.70.0: Success
(The process size limit can be smaller for cortext-a72's doing
aarch32/armv7 activity than on a cortex-a7 armv7 system. That
might contribute to hitting the issue.)
===
Mark Millard
marklmi at yahoo.com
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