diff options
Diffstat (limited to 'doc/manual/writing-nix-expressions.xml')
| -rw-r--r-- | doc/manual/writing-nix-expressions.xml | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/doc/manual/writing-nix-expressions.xml b/doc/manual/writing-nix-expressions.xml index 2294fc69a..cf590190c 100644 --- a/doc/manual/writing-nix-expressions.xml +++ b/doc/manual/writing-nix-expressions.xml @@ -428,7 +428,14 @@ lrwxrwxrwx ... 2006-09-29 10:43 result -> /nix/store/632d2b22514d...-hello-2.1.1 $ ./result/bin/hello Hello, world!</screen> -</para> +The <link linkend='opt-attr'><option>-A</option></link> option selects +the <literal>hello</literal> attribute from +<filename>all-packages.nix</filename>. This is faster than using the +symbolic package name specified by the <literal>name</literal> +attribute (which also happens to be <literal>hello</literal>) and is +unambiguous (there can be multiple packages with the symbolic name +<literal>hello</literal>, but there can be only one attribute in a set +named <literal>hello</literal>).</para> <para><command>nix-build</command> registers the <filename>./result</filename> symlink as a garbage collection root, so @@ -470,8 +477,8 @@ So it is always safe to run multiple instances of Nix in parallel <para>If you have a system with multiple CPUs, you may want to have Nix build different derivations in parallel (insofar as possible). -Just pass the option <option linkend='opt-max-jobs'>-j -<replaceable>N</replaceable></option>, where +Just pass the option <link linkend='opt-max-jobs'><option>-j +<replaceable>N</replaceable></option></link>, where <replaceable>N</replaceable> is the maximum number of jobs to be run in parallel, or set. Typically this should be the number of CPUs.</para> |