nordic-dev.net/nixpkgs
nordic-dev.net/nixpkgs
2
0
Fork 0
mirror of https://github.com/NixOS/nixpkgs.git synced 2024-11-29 10:23:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #69060 from alexfmpe/fix-example

Browse Source 
Fix example
This commit is contained in:
Matthew Bauer 2019-09-19 10:36:14 -04:00 committed by GitHub
commit ba91110c61
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
doc/cross-compilation.xml
View File

@ -271,14 +271,14 @@
<para>
Nixpkgs can be instantiated with <varname>localSystem</varname> alone, in which case there is no cross-compiling and everything is built by and for that system, or also with <varname>crossSystem</varname>, in which case packages run on the latter, but all building happens on the former. Both parameters take the same schema as the 3 (build, host, and target) platforms defined in the previous section. As mentioned above, <literal>lib.systems.examples</literal> has some platforms which are used as arguments for these parameters in practice. You can use them programmatically, or on the command line:
<programlisting>
nix-build &lt;nixpkgs&gt; --arg crossSystem '(import &lt;nixpkgs/lib&gt;).systems.examples.fooBarBaz' -A whatever</programlisting>
nix-build '&lt;nixpkgs&gt;' --arg crossSystem '(import &lt;nixpkgs/lib&gt;).systems.examples.fooBarBaz' -A whatever</programlisting>
</para>
<note>
<para>
Eventually we would like to make these platform examples an unnecessary convenience so that
<programlisting>
nix-build &lt;nixpkgs&gt; --arg crossSystem '{ config = "&lt;arch&gt;-&lt;os&gt;-&lt;vendor&gt;-&lt;abi&gt;"; }' -A whatever</programlisting>
nix-build '&lt;nixpkgs&gt;' --arg crossSystem '{ config = "&lt;arch&gt;-&lt;os&gt;-&lt;vendor&gt;-&lt;abi&gt;"; }' -A whatever</programlisting>
works in the vast majority of cases. The problem today is dependencies on other sorts of configuration which aren't given proper defaults. We rely on the examples to crudely to set those configuration parameters in some vaguely sane manner on the users behalf. Issue <link xlink:href="https://github.com/NixOS/nixpkgs/issues/34274">#34274</link> tracks this inconvenience along with its root cause in crufty configuration options.
</para>
</note>