bug#27076: [PATCH] build-system/cmake: Add support for cross compilation.

[Ricardo Wurmus <rekado@elephly.net>]

Ricardo Wurmus <rekado@elephly.net> writes:

> diff --git a/guix/build-system/cmake.scm b/guix/build-system/cmake.scm
> index 25ac262d5..ee116c5a4 100644
> --- a/guix/build-system/cmake.scm
> +++ b/guix/build-system/cmake.scm
[…]
> +  (bag
> +    (name name)
> +    (system system)
> +    (target target)
> +    (build-inputs `(,@(if source
> +                          `(("source" ,source))
> +                          '())
> +                    ,@`(("cmake" ,cmake))
> +                    ,@native-inputs
> +                    ,@(if target
> +                          ;; Use the standard cross inputs of
> +                          ;; 'gnu-build-system'.
> +                          (standard-cross-packages target 'host)
> +                          '())
> +                    ;; Keep the standard inputs of 'gnu-build-system'.
> +                    ,@(standard-packages)))
> +    (host-inputs inputs)
> +
> +    ;; The cross-libc is really a target package, but for bootstrapping
> +    ;; reasons, we can't put it in 'host-inputs'.  Namely, 'cross-gcc' is a
> +    ;; native package, so it would end up using a "native" variant of
> +    ;; 'cross-libc' (built with 'gnu-build'), whereas all the other packages
> +    ;; would use a target variant (built with 'gnu-cross-build'.)
> +    (target-inputs (if target
> +                       (standard-cross-packages target 'target)
> +                       '()))

This was the only change compared to the previous patch, which would set
“target-inputs” without checking if “target” is provided.

-- 
Ricardo

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