* guix-build.in (leave): New macro, formerly in `guix-build'. (show-help): Document `--cores'. (%options): Add `--cores'. (guix-build): Remove `leave' macro from here. Pass the `cores' option value to `set-build-options'.
* guix-build.in (guix-build): Display multiple outputs when there's more than one.
* guix-build.in: New file. * configure.ac: Emit `guix-build'. Add `commands-exec'. * Makefile.am (bin_SCRIPTS): New variable. * po/POTFILES.in: Add `guix-build.in'.