Re: 'guix build --target=' handling questions

[John Darrington <john@darrington.wattle.id.au>]

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On Wed, Feb 22, 2017 at 10:54:22PM +0000, Sergei Trofimovich wrote:
     
      (define-module (gnu packages regex)
        #:use-module ((guix licenses) #:prefix license:)
        #:use-module (guix packages)
        #:use-module (guix download)
     -  #:use-module (guix build-system gnu))
     +  #:use-module (guix build-system gnu)
     +  #:use-module (guix utils) ; for %current-target-system
     +  )
     
      (define-public re2
         (package
           (name "re2")
           (version "2017-01-01")
     @@ -40,11 +42,15 @@
                       "0yij1ajh66h3pj3kfz7y0ldrsww8rlpjzaavyr5lchl98as1jq74"))))
           (build-system gnu-build-system)
           (arguments
            `(#:test-target "test"
              ;; There is no configure step, but the Makefile respects a prefix.
     -        #:make-flags (list (string-append "prefix=" %output))
     +        #:make-flags (list (string-append "prefix=" %output)
     +                           (string-append "CXX=" ,(string-append (if (%current-target-system)
     +                                                                     (string-append (%current-target-system) "-")
     +                                                                     "")
     +                                                                 "g++")))
              #:phases
              (modify-phases %standard-phases
                (delete 'configure)
                (add-after 'install 'delete-static-library
                  (lambda* (#:key outputs #:allow-other-keys)
     
     It looks clumsy and potentially requires more tools to be wrapped like that.
     
     At least 'ar' for this package. Perhaps there is a function that already
     adds a "${target}-" and I've missed it?
     

So far as I'm aware there is no better solution than what you have proposed.  It is a common
problem for packages which don't provide a proper autoconf ./configure script.

J'



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