> 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 ${target}-g++.
Thus the following workaround seems to work:
diff --git a/gnu/packages/regex.scm b/gnu/packages/regex.scm
index f04cba706..a8fa689ab 100644
--- a/gnu/packages/regex.scm
+++ b/gnu/packages/regex.scm
@@ -20,11 +20,13 @@
(define-module (gnu packages regex)
#:use-module ((guix licenses) #:prefix license:)
#:use-module (guix packages)
#:use-module (guix download)
- #:use-module (guix build-system gnu))
+ #:use-module (guix build-system gnu)
+ #:use-module (guix utils) ; for %current-target-system
+ )
(define-public re2
(package
(name "re2")
(version "2017-01-01")
@@ -40,11 +42,15 @@
"0yij1ajh66h3pj3kfz7y0ldrsww8rlpjzaavyr5lchl98as1jq74"))))
(build-system gnu-build-system)
(arguments
`(#:test-target "test"
;; There is no configure step, but the Makefile respects a prefix.
- #:make-flags (list (string-append "prefix=" %output))
+ #:make-flags (list (string-append "prefix=" %output)
+ (string-append "CXX=" ,(string-append (if
(%current-target-system)
+
(string-append (%current-target-system) "-")
+ "")
+ "g++")))
#:phases
(modify-phases %standard-phases
(delete 'configure)
(add-after 'install 'delete-static-library
(lambda* (#:key outputs #:allow-other-keys)
It looks clumsy and potentially requires more tools to be wrapped like that.
At least 'ar' for this package. Perhaps there is a function that already
adds a "${target}-" and I've missed it?
--
Sergei
pgpaAoEdth0Gv.pgp
Description: Цифровая подпись OpenPGP
