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top-level: Deprecate top-level {build,host,target}Platform

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I don't know when we can/should remove them, but this at least gets
people to stop using them. The preferred alternatives also date back to
17.09 so writing forward-compatable code without extra conditions is
easy.

Beginning with these as they are the least controversial.
This commit is contained in:
John Ericson 2018-08-27 14:39:58 -04:00
parent 51907d257c
commit e51f736076
2 changed files with 14 additions and 12 deletions
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10
doc/cross-compilation.xml
View file

@ -47,13 +47,9 @@
<para>
In Nixpkgs, these three platforms are defined as attribute sets under the
names <literal>buildPlatform</literal>, <literal>hostPlatform</literal>,
and <literal>targetPlatform</literal>. All three are always defined as
attributes in the standard environment, and at the top level. That means
one can get at them just like a dependency in a function that is imported
with <literal>callPackage</literal>:
<programlisting>{ stdenv, buildPlatform, hostPlatform, fooDep, barDep, .. }: ...buildPlatform...</programlisting>
, or just off <varname>stdenv</varname>:
names <literal>buildPlatform</literal>, <literal>hostPlatform</literal>, and
<literal>targetPlatform</literal>. They are always defined as attributes in
the standard environment. That means one can access them like:
<programlisting>{ stdenv, fooDep, barDep, .. }: ...stdenv.buildPlatform...</programlisting>
.
</para>

16
pkgs/top-level/stage.nix
View file

@ -79,11 +79,17 @@ let
# The old identifiers for cross-compiling. These should eventually be removed,
# and the packages that rely on them refactored accordingly.
platformCompat = self: super: let
inherit (super.stdenv) buildPlatform hostPlatform targetPlatform;
in {
inherit buildPlatform hostPlatform targetPlatform;
inherit (buildPlatform) system;
platformCompat = self: super: {
buildPlatform = lib.warn
"top-level `buildPlatform` is deprecated since 18.09. Please use `stdenv.buildPlatform`."
super.stdenv.buildPlatform;
hostPlatform = lib.warn
"top-level `hostPlatform` is deprecated since 18.09. Please use `stdenv.hostPlatform`."
super.stdenv.hostPlatform;
targetPlatform = lib.warn
"top-level `targetPlatform` is deprecated since 18.09. Please use `stdenv.targetPlatform`."
super.stdenv.targetPlatform;
inherit (super.stdenv.buildPlatform) system;
};
splice = self: super: import ./splice.nix lib self (buildPackages != null);