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

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

[Josh Marshall]

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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.

[-- Attachment #2: 0545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv.bz2 --]
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[-- Attachment #3: magic-enum.scm --]
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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

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

[Josh Marshall]

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Hello,

Resending because I didn't get a post acknowledgement.

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.

[-- Attachment #2: 0545hcvyz4p07jc5xz4crak2cvpxpv-magic-enum-0.6.3.drv.bz2 --]
[-- Type: application/bzip2, Size: 3779 bytes --]

[-- Attachment #3: magic-enum.scm --]
[-- Type: application/octet-stream, Size: 1205 bytes --]

(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

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

[sirgazil]

---- On Fri, 29 Nov 2019 08:22:38 -0500 Josh Marshall <joshua.r.marshall.1991@gmail.com> wrote ----

 > Hello, 
 >  
 > Resending because I didn't get a post acknowledgement. 

I see it.

The previous one was posted too, though: https://lists.gnu.org/archive/html/help-guix/2019-11/msg00199.html

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

[Tobias Geerinckx-Rice]

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Josh,

Welcome!

Josh Marshall 写道：
> 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.

Well…  I'm easily stumped but that's actually not the case here.

You've added gcc-9 to ‘inputs’.  If you rename your ‘inputs’ field 
to ‘native-inputs’ you'll the see the magic kick in:

  $ guix build -f magic_enum.scm
  […]
  g++ (GCC) 9.2.0
  Copyright (C) 2019 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions. 
  There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A 
  PARTICULAR PURPOSE.

:-)

After removing the debugging ‘ --version’, it complains that:

  cc1plus: error: command line option ?-std=gnu17? is valid for 
  C/ObjC but not for C++ [-Werror]

True dat.  So I edit your code to read:

  #:configure-flags '("-DCMAKE_CXX_FLAGS=-std=c++17")

Note that there's no need for 'quotes' here.  Guix doesn't pass 
command lines to a shell like many other build systems.

Et pouf!

  $ guix build -f magic_enum.scm
  […]
  /gnu/store/h9npwdihnwr11xdbqjr20q5w2r6dbw1x-magic-enum-0.6.3

  $ tree 
  /gnu/store/h9npwdihnwr11xdbqjr20q5w2r6dbw1x-magic-enum-0.6.3
  /gnu/store/h9npwdihnwr11xdbqjr20q5w2r6dbw1x-magic-enum-0.6.3
  ├── include
  │   └── magic_enum.hpp
  ├── lib
  │   └── cmake
  │       └── magic_enum
  │           ├── magic_enumConfig.cmake
  │           └── magic_enumConfigVersion.cmake
  └── share
      └── doc
          └── magic-enum-0.6.3
              └── LICENSE

Glorious.

> Resending because I didn't get a post acknowledgement.

I don't think (first) posts are explicitly acknowledged.  The 
mailing lists are sometimes delayed (seldom more than a few 
minutes).  The Web archives have a similar but often longer delay.

> nckd and I have gone back and forth over a few days in IRC

Close ;-)  I know, weird nick, see my real name for an 
explanation.

Kind regards,

T G-R

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

[Marius Bakke]

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Hi Josh,

Josh Marshall <joshua.r.marshall.1991@gmail.com> writes:

> 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.

If you change 'inputs' to 'native-inputs', then CMake will pick up the
correct GCC, and you can remove the (arguments ...) block.

(you probably wanted -std=gnu++17 instead of -std=gnu17 too, but no need
when using GCC 9)

Pro tip: use 'guix build -f magic-enum.scm' to get the build output
right in your terminal.  :-)

HTH,
Marius

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