Fwd: Packaging a cmake C++ header only library requiring C++17

[Josh Marshall <joshua.r.marshall.1991@gmail.com>]

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Hello,

nckd and I have gone back and forth over a few days in IRC trying to
help me out here.  I am trying to package magic-enum (
https://github.com/Neargye/magic_enum ) which is a C++ header only
library requiring at least C++ 17, and uses the cmake build system.
The problem which we can't figure out is why the compiler being used
is the default for `gcc` at 7.4 while there is explicit use and
dependency on `gcc` 9.2 via `gcc-9`.  We're stumped.

Attached are the latest package definitions, build log, and cli
invocation and output.

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(define-module (gnu packages magic-enum)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system cmake)
  #:use-module (guix licenses)
  #:use-module (gnu packages gcc))

(define-public magic-enum
  (package
    (name "magic-enum")
    (version "0.6.3")
    (source (origin
              (method url-fetch)
              (uri (string-append "https://github.com/Neargye/magic_enum/archive/v" version ".tar.gz" ))
              (sha256
               (base32
                "0g22jiykx7dznskvkba6qmdasr7pbqp8a15sp0738kw9yjfgx6ak"))))
    (build-system cmake-build-system)
    (arguments
      '(#:tests? #t ;
        #:configure-flags '("-DCMAKE_CXX_FLAGS='-std=gnu17 --version'")))
        ; #:make-flags '("CMAKE_CXX_FLAGS=-std=gnu17")))
    (inputs `(("gcc", gcc-9)))
    (synopsis "Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code")
    (description "Header-only C++17 library provides static reflection for enums, work with any enum type without any macro or boilerplate code.")
    (home-page "https://github.com/Neargye/magic_enum")
    (license expat)))


magic-enum

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anadon@goodadvicemallard:~/Documents/code/guix-packages$ guix package --install-from-file=magic-enum.scm
substitute: /gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.utf8)
substitute: /gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.utf8)
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.utf8)
/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.utf8)
building /gnu/store/l90545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv...
- 'check' phasebuilder for `/gnu/store/l90545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv' failed with exit code 1
build of /gnu/store/l90545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv failed
View build log at '/var/log/guix/drvs/l9/0545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv.bz2'.
guix package: error: build of `/gnu/store/l90545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv' failed