cctools: support LTO on Darwin

LTO is disabled during bootstrap to keep the bootstrap tools small and
avoid unnecessary LLVM rebuilds, but is enabled in the final stdenv
stage and should be usable by normal packages.

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/stdenv/darwin/default.nix b/pkgs/stdenv/darwin/default.nix
index d287517e8868..c361ae6e4021 100644
--- a/pkgs/stdenv/darwin/default.nix
+++ b/pkgs/stdenv/darwin/default.nix
@@ -201,6 +201,7 @@ in rec {
       python2 = self.python;
 
       ninja = super.ninja.override { buildDocs = false; };
+      darwin = super.darwin // { cctools = super.darwin.cctools.override { llvm = null; }; };
     };
   in with prevStage; stageFun 1 prevStage {
     extraPreHook = "export NIX_CFLAGS_COMPILE+=\" -F${bootstrapTools}/Library/Frameworks\"";