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packages: Implement `package-cross-derivation'.

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* guix/packages.scm (package-transitive-target-inputs,
  package-transitive-native-inputs): New procedures.
  (package-derivation): Parametrize `%current-target-system'.
  (package-cross-derivation): Implement.
* guix/utils.scm (%current-target-system): New variable.
* tests/packages.scm ("package-cross-derivation"): New test.
* doc/guix.texi (Defining Packages): Document
  `package-cross-derivation'.
This commit is contained in:
Ludovic Courtès
2013-05-24 22:21:24 +02:00
parent 17bb886ff4
commit 9c1edabd8b
4 changed files with 98 additions and 5 deletions
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17
doc/guix.texi
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@@ -919,6 +919,23 @@ must be a connection to the daemon, which operates on the store
(@pxref{The Store}).
@end deffn
@noindent
@cindex cross-compilation
Similarly, it is possible to compute a derivation that cross-builds a
package for some other system:
@deffn {Scheme Procedure} package-cross-derivation @var{store} @
@var{package} @var{target} [@var{system}]
Return the derivation path and corresponding @code{<derivation>} object
of @var{package} cross-built from @var{system} to @var{target}.
@var{target} must be a valid GNU triplet denoting the target hardware
and operating system, such as @code{"mips64el-linux-gnu"}
(@pxref{Configuration Names, GNU configuration triplets,, configure, GNU
Configure and Build System}).
@end deffn
@node The Store
@section The Store