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From: Ekaitz Zarraga <ekaitz@elenq.tech>
To: "guix-devel\\@gnu.org" <guix-devel@gnu.org>
Subject: Re: GCC:  Canadian Cross + Dynamic linker issues
Date: Wed, 07 Apr 2021 10:48:33 +0000	[thread overview]
Message-ID: <3fkeacs8utn3gE9NbPcDOyvCyS6o2fi09HtR7TI0JxEoWGxMog0fb0aPPkS5Ql99oJR2ine59PdzccC-XcVsjpxePdmzTxw2PdW1XT0OY0A=@elenq.tech> (raw)
In-Reply-To: <_AbV1fmXZO2t0n9rEa7I0GVYI1tA0xCD5LM38VFA4-MeleekWvU1iPVJ_vgegmIBQ4LpwRFKzMKS2SY5_oXp6GbpnbaowL_MX5lwZNk61FI=@elenq.tech>

Let me please bump this thread a little bit, since I didn't get
any answer

> Hi,
>
> I've been struggling with GCC package definition for a while and I hope someone
> can help me solve or improve what I think are issues in its definition.
>
> I'm working on a R7RS-Small Scheme implementation that compiles to RISC-V
> assembly and I'm finding many issues to create a RISC-V cross compiler.
>
> Consider the following manifest file for my project, where I need a GCC for
> a 32 bit RISC-V machine:
>
>     (use-modules (gnu packages cross-base)
>                  (gnu packages gcc)
>                  (gnu packages embedded))
>
>     (packages->manifest
>
>       (let* ((triplet "riscv32-unknown-elf")
>              (binutils (cross-binutils triplet)))
>             (list
>               binutils
>               (cross-gcc triplet
>                          #:xbinutils binutils
>                          #:libc #f))))
>
>
> The call to cross-gcc fails to find a dynamic linker and the installation
> fails.
>
> This happens because GCC package definition calls to the function
> `glibc-dynamic-linker` in `gnu/packages/bootstrap.scm`, that contains a list of
> possible triplets with their associated dynamic linker file name.
>
> I don't really understand why does a generic GCC package need to call a
> function from the bootstrap module by default. I can see why GCC takes a huge
> part on the bootstrapping process of Guix but I think that kind of coupling is
> compromising the flexibility of the generic GCC package. Please, correct me if
> I'm wrong.
>
> That said, in the past, I sent a patch[^patch] as a workaround because I saw
> some references to AVR on the `glibc-dynamic-linker` that also used a fake
> dynamic linker to avoid the function to fail but I got no response so I'm not
> sure if the change makes any sense.
>
> Digging further on the GCC package definition I found a note that says:
>
> > ;; None of the flags below are needed when doing a Canadian cross.
> > ;; TODO: Simplify this.
>
> So I wonder if that's the source of the problems I'm finding here.
>
> The `glibc-dynamic-linker` function is being used twice in the block preceded
> by that comment and only once more below, in some patches we are applying on
> top of the source code.
>
> At this level I'm not sure if there's any way to "fix" GCC package definition
> to be able to create cross-compilers or if I should create a separate package
> for my specific use-case and forget about all this.
>
> I would love to take part and try to simplify the GCC package description, but
> as it is a fundamental package looks like a huge responsibility so I'd like to
> have some guidance first.
>
> Thanks,
>
> Ekaitz
>
> [^patch]: https://issues.guix.gnu.org/46059




      reply	other threads:[~2021-04-07 10:55 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 11:45 Ekaitz Zarraga
2021-04-07 10:48 ` Ekaitz Zarraga [this message]

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