pack: Add '--target'.

* guix/scripts/pack.scm (self-contained-tarball): Add #:target.
(docker-image): Add #:target.
[build]: Pass it to 'build-docker-image'.
(%options, show-help): Add '--target'.
(guix-pack): Pass TARGET to 'profile-derivation' and to 'build-image'.
* guix/docker.scm (build-docker-image): Add #:system parameter and honor it.
* doc/guix.texi (Invoking guix pack): Document '--target'.
(Additional Build Options): Refer to the Autoconf manual instead of the
obsolete 'configure.info' for cross-compilation.

1 files changed, 8 insertions, 2 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 3db6dad5f3..0a09bba06f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -2476,6 +2476,12 @@ Docker Image Specification}.
 Attempt to build for @var{system}---e.g., @code{i686-linux}---instead of
 the system type of the build host.
 
+@item --target=@var{triplet}
+@cindex cross-compilation
+Cross-build for @var{triplet}, which must be a valid GNU triplet, such
+as @code{"mips64el-linux-gnu"} (@pxref{Specifying target triplets, GNU
+configuration triplets,, autoconf, Autoconf}).
+
 @item --compression=@var{tool}
 @itemx -C @var{tool}
 Compress the resulting tarball using @var{tool}---one of @code{gzip},
@@ -5063,8 +5069,8 @@ to build packages in a complete 32-bit environment.
 @item --target=@var{triplet}
 @cindex cross-compilation
 Cross-build for @var{triplet}, which must be a valid GNU triplet, such
-as @code{"mips64el-linux-gnu"} (@pxref{Configuration Names, GNU
-configuration triplets,, configure, GNU Configure and Build System}).
+as @code{"mips64el-linux-gnu"} (@pxref{Specifying target triplets, GNU
+configuration triplets,, autoconf, Autoconf}).
 
 @anchor{build-check}
 @item --check