[bug#57675] [PATCH v3 3/7] gnu: Add abseil-cpp-cxxstd17.

[Liliana Marie Prikler <liliana.prikler@gmail.com>]

Am Sonntag, dem 11.09.2022 um 18:11 +0800 schrieb Hilton Chain:
> 
> * gnu/packages/telegram.scm (abseil-cpp-cxxstd17): New variable.
> ---
>  gnu/packages/telegram.scm | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/gnu/packages/telegram.scm b/gnu/packages/telegram.scm
> index 6e7fa4a2ec..3b0444025c 100644
> --- a/gnu/packages/telegram.scm
> +++ b/gnu/packages/telegram.scm
> @@ -62,6 +62,7 @@ (define-module (gnu packages telegram)
>    #:use-module (gnu packages xorg)
>    #:use-module ((guix licenses) #:prefix license:)
>    #:use-module (guix packages)
> +  #:use-module (guix utils)
>    #:use-module (guix git-download)
>    #:use-module (guix build-system cmake)
>    #:use-module (guix build-system copy)
> @@ -71,6 +72,18 @@ (define-module (gnu packages telegram)
>    #:use-module (guix build-system python)
>    #:use-module (guix build-system qt))
> 
> +(define-public abseil-cpp-cxxstd17
> +  (let ((base abseil-cpp))
> +    ;; Abseil built with pre C++17 standards enforcing would cause a
> linking
> +    ;; issue when building Telegram Destop. (Currently it's by
> default 11, and
> +    ;; has changed to 14 upstream.)
> +    (hidden-package
> +     (package/inherit base
> +       (arguments
> +        (substitute-keyword-arguments (package-arguments base)
> +          ((#:configure-flags flags)
> +           `(cons* "-DCMAKE_CXX_STANDARD=17" ,flags))))))))
> +
For the record, this ought to be placed near abseil-cpp, because the
semantics of inheritance can screw you over cross-module.

Cheers