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Zucca
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Joined: 14 Jun 2007
Posts: 4058
Location: Rasi, Finland
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 Posted: Thu May 08, 2025 7:47 am Post subject: musl/llvm + rust: chicken & egg, how to bootstrap? |
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So... I've set up yet another machine.
This one's gonna be a so called "controller" - it will control some relay boards over serial line.
Because it has only a Celeron N3010 and 8GB RAM, I decided to to play around a little and go with (experimental) musl/llvm toolchain. Fun to experiment at least. This way I can avoid having two compiler sets (llvm+friends + gcc). I try to avoid having lot's of big packages, for now, because: | Code: | | sys-kernel/gentoo-kernel-6.6.88: 18 hours, 39 minutes, 13 seconds |
However... Eventually I will need rust because of some dependency requirement.
Then problem is that there's no rust-bin for amd64/musl/llvm.
The mrustc doesn't help either as: | Code: | DEPEND="sys-libs/zlib"
# mrustc transpiles Rust to C, and currently the C code it generates doesn't currently work with clang
RDEPEND="
${DEPEND}
sys-devel/gcc:*
"
BDEPEND="sys-devel/gcc:*" |
... I really would like to avoid gcc on this system.
There seems to be no binary packages for rust or mrustc for amd64/musl/llvm either.
It looks like my only option is mrustc via gcc compilation. Correct?
I'll avoid rust for now... But eventually I think I'll need it anyways. Unless llvm project pops out their rust compiler.
Tips, suggestions?
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..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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sam_
Developer
Joined: 14 Aug 2020
Posts: 2310
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| Posted: Thu May 08, 2025 8:46 am Post subject: Re: musl/llvm + rust: chicken & egg, how to bootstrap? |
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| Zucca wrote: | So... I've set up yet another machine.
This one's gonna be a so called "controller" - it will control some relay boards over serial line.
Because it has only a Celeron N3010 and 8GB RAM, I decided to to play around a little and go with (experimental) musl/llvm toolchain. Fun to experiment at least. This way I can avoid having two compiler sets (llvm+friends + gcc). I try to avoid having lot's of big packages, for now, because: | Code: | | sys-kernel/gentoo-kernel-6.6.88: 18 hours, 39 minutes, 13 seconds |
However... Eventually I will need rust because of some dependency requirement.
Then problem is that there's no rust-bin for amd64/musl/llvm.
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I think this is actually some error in the profiles I keep meaning to look at. The binary should work. Try unmasking it. |
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Zucca
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Joined: 14 Jun 2007
Posts: 4058
Location: Rasi, Finland
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| Posted: Thu May 08, 2025 6:20 pm Post subject: Re: musl/llvm + rust: chicken & egg, how to bootstrap? |
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| sam_ wrote: | | The binary should work. Try unmasking it. |
I assume you mean rust-bin?
Yeah. I've actually unmasked one version...
But I keep getting stuck because | Code: | RDEPEND="
>=app-eselect/eselect-rust-20190311
dev-libs/openssl
sys-apps/lsb-release
sys-devel/gcc:*
!dev-lang/rust:stable
!dev-lang/rust-bin:stable
" |
... it needs gcc at runtime?
Is this correct? Does it need some gcc provided library?
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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sam_
Developer
Joined: 14 Aug 2020
Posts: 2310
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| Posted: Thu May 08, 2025 6:52 pm Post subject: |
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| Yes, it needs libgcc* at least. |
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Zucca
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Joined: 14 Jun 2007
Posts: 4058
Location: Rasi, Finland
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| Posted: Thu May 08, 2025 9:00 pm Post subject: |
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Dang it. :P
Well... I'll start compiling.
I guess one cannot have gcc-less or llvm-less system... at least not that easily.
I think I read somewhere gcc folks are working on some experimental rust compiler. I wonder what's on the llvm side...
Yes. These two are not comparable as-is, but I'd hope to use only one of them in some cases, instead of having both being part of the regular system.
Anyway. I like experimenting with these not-so-common profiles... I'll see what comes out if this. So far pretty nice, unless one wants rust. But that either isn't impossible. ;)
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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sam_
Developer
Joined: 14 Aug 2020
Posts: 2310
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| Posted: Thu May 08, 2025 9:29 pm Post subject: |
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| rustc is the LLVM side? |
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Zucca
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Joined: 14 Jun 2007
Posts: 4058
Location: Rasi, Finland
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| Posted: Fri May 09, 2025 8:55 am Post subject: |
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Ah. So rustc is an "llvm compiler" like clang? Didn't knew that.
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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bstaletic
Guru
Joined: 05 Apr 2014
Posts: 506
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| Posted: Fri May 09, 2025 5:05 pm Post subject: |
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Yes, rustc uses llvm as its backend.
As far as I know mrustc does not officially support musl/clang systems, but!
If the only dependency on gcc is mrustc, then you'd only need to compile gcc once. Later on you can use rustc and system llvm to compile newer versions of rustc. |
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Zucca
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Joined: 14 Jun 2007
Posts: 4058
Location: Rasi, Finland
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| Posted: Sun May 11, 2025 5:17 pm Post subject: |
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| bstaletic wrote: | | If the only dependency on gcc is mrustc, then you'd only need to compile gcc once. Later on you can use rustc and system llvm to compile newer versions of rustc. |
Yes. This is what I hope for.
I'm now back home and I'll continue tinkering with the machine.
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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