guix: dune-build-system: Add a package parameter.

* guix/build-system/dune.scm: Add a package parameter.
* guix/build/dune.scm (build, test, install): Use it.
* doc/guix.texi: Document it.

1 files changed, 5 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index d10fbce3a4..6e8ce3c084 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5816,6 +5816,11 @@ list of flags passed to the @code{dune} command during the build.
 The @code{#:jbuild?} parameter can be passed to use the @code{jbuild}
 command instead of the more recent @code{dune} command while building
 a package.  Its default value is @code{#f}.
+
+The @code{#:package} parameter can be passed to specify a package name, which
+is useful when a package contains multiple packages and you want to build
+only one of them.  This is equivalent to passing the @code{-p} argument to
+@code{dune}.
 @end defvr
 
 @defvr {Scheme Variable} go-build-system