top-level: Remove cycles: stdenv calls in top-level but not vice versa

This commit changes the dependencies of stdenv, and clean-up the stdenv
story by removing the `defaultStdenv` attribute as well as the `bootStdenv`
parameter.

Before, the final bootstrapping stage's stdenv was provided by
all-packages, which was iterating multiple times over the
top-level/default.nix expression, and non-final bootstrapping stages'
stdenvs were explicitly specified with the `bootStdenv` parameter.

Now, all stages' stdenvs are specified with the `stdenv` parameter.
For non-final bootstrapping stages, this is a small change---basically just
rename the parameter.
For the final stage, top-level/default.nix takes the chosen stdenv and
makes the final stage with it.

`allPackages` is used to make all bootstrapping stages, final and
non-final alike. It's basically the expression of `stage.nix` (along with a
few partially-applied default arguments)

Note, the make-bootstrap-tools scripts are temporarily broken

1 files changed, 2 insertions, 1 deletions

diff --git a/pkgs/stdenv/native/default.nix b/pkgs/stdenv/native/default.nix
index fcd0805275be..22b4dc1400fe 100644
--- a/pkgs/stdenv/native/default.nix
+++ b/pkgs/stdenv/native/default.nix
@@ -127,7 +127,8 @@ rec {
 
   stdenvBoot1Pkgs = allPackages {
     inherit system;
-    bootStdenv = stdenvBoot1;
+    allowCustomOverrides = false;
+    stdenv = stdenvBoot1;
   };