From: ludo@gnu.org (Ludovic Courtès)
To: Sergei Trofimovich <slyfox@inbox.ru>
Cc: guix-devel@gnu.org
Subject: Re: 'guix build --target=' handling questions
Date: Mon, 06 Mar 2017 17:04:18 +0100 [thread overview]
Message-ID: <87y3wiqtml.fsf@gnu.org> (raw)
In-Reply-To: <20170222225422.2d1020ba@sf> (Sergei Trofimovich's message of "Wed, 22 Feb 2017 22:54:22 +0000")
Sergei Trofimovich <slyfox@inbox.ru> skribis:
>> Question time:
>>
>> - Is there a way to run 'guix environment --target=' in the same way as 'guix build --target='
>> sets it up? I'd like to see how both compilers are supposed to be present in there.
>>
>> - Why default g++ in PATH is the host g++ and not target g++?
>> Target seems to make most sense if no explicit compiler is specified.
>>
>> - How to actually set CXX to point to target g++?
>> It looks like implicitly there already both host (through native-inputs)
>> and target (through build-inputs) compilers available.
>> I would expect something like
>> #:make-flags (list (string-append "CXX=" <.?.>))
>> What should be in place of that "<.?.>" to refer to target g++?
>
> I think I've found a workaround at least for my third question.
>
> Both host and target compilers are available as g++ and ${target}-g++.
>
> Thus the following workaround seems to work:
>
> diff --git a/gnu/packages/regex.scm b/gnu/packages/regex.scm
> index f04cba706..a8fa689ab 100644
> --- a/gnu/packages/regex.scm
> +++ b/gnu/packages/regex.scm
> @@ -20,11 +20,13 @@
>
> (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++")))
As John wrote, this is the right fix for this package.
If you can send it with ‘git send-email’ (see
<https://www.gnu.org/software/guix/manual/html_node/Submitting-Patches.html>),
I’ll apply it right away. Otherwise I can do it on your behalf.
Thanks!
Ludo’.
next prev parent reply other threads:[~2017-03-06 16:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 21:40 'guix build --target=' handling questions Sergei Trofimovich
2017-02-22 22:54 ` Sergei Trofimovich
2017-02-23 17:07 ` John Darrington
2017-03-06 16:04 ` Ludovic Courtès [this message]
2017-03-06 22:01 ` Sergei Trofimovich
2017-03-07 14:48 ` Ludovic Courtès
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