Subject: [bug#54599] [PATCH] gnu: libdaemon: fix build for riscv64

From: Thiago Jung Bauermann <[email-masked]>
Date: Mon, 28 Mar 2022 22:25:20 -0300

Hello,

Thanks for this patch! Just a few comments:

fesoj000 <[email-masked]> writes:

> * gnu/packages/libdaemon.scm: (native-inputs): Add check for riscv64 to
> include config
> * gnu/packages/libdaemon.scm: (arguments): Add check for riscv64 to add
> update-config.sub build step

In the changelog, the name of the package goes in the parentheses, and
the package attribute being changed in square brackets. For example:

* gnu/packages/libdaemon.scm (libdaemon)[native-inputs]: Add check for
riscv64 to include config.

Also the sentences should have a period at the end.

> ---
>  gnu/packages/libdaemon.scm | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/gnu/packages/libdaemon.scm b/gnu/packages/libdaemon.scm
> index 9dc851e823..e91b651e5a 100644
> --- a/gnu/packages/libdaemon.scm
> +++ b/gnu/packages/libdaemon.scm
> @@ -49,7 +49,8 @@ (define-public libdaemon
>               (file-name (string-append name "-" version ".tar.gz"))))
>      (build-system gnu-build-system)
>      (native-inputs
> -     (if (and=> (%current-target-system) target-aarch64?)
> +     (if (or (target-aarch64?)
> +             (target-riscv64?))
>           `(("config" ,config)) ; for config.sub
>           '()))
>      (arguments
> @@ -66,7 +67,8 @@ (define-public libdaemon
>                                         ;; Hurd's console client.
>                                         "--localstatedir=/var"))
>               '())
> -       ,@(if (and=> (%current-target-system) target-aarch64?)
> +       ,@(if (or (target-aarch64?)
> +                 (target-riscv64?))
>               `(#:phases
>                 (modify-phases %standard-phases
>                   (add-before 'configure 'update-config.sub

Before the patch, ‘native-inputs’ and ‘arguments’ were only changed when
cross-compiling on aarch64. After your patch, they are changed even for
native builds.

Functionally, it's not a problem but this changes the package's
derivation. Since the package has many dependents, it causes a lot of
other packages to be rebuilt:

popigai: guix refresh --list-dependent libdaemon 
Building the following 1496 packages would ensure 3175 dependent packages are rebuilt: …

Because of this, the patch can't be applied on the master branch. It
would have to go to core-updates.

So for the master branch, you need to keep the property of only making
changes to ‘native-inputs’ and ‘arguments’ when cross-compiling.

But I also suggest sending an additional patch for the core-updates
branch which unconditionally updates config.sub, regardless of the
architecture and regardless of whether it's a native compilation or a
cross one. This way, the next time Guix is ported to a new architecture
we won't need to update this package again.

-- 
Thanks
Thiago