From 18211adceb903a2efc9cf99e36c87718ba3846c3 Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Mon, 23 Sep 2024 22:06:54 -0400
Subject: [PATCH] llvmPackages.libcxx: use a bootstrap stdenv on Darwin

Using a bootstrap stdenv is needed to avoid infinite recursions that
occur due to inputs propagated by SDK that depend on libc++.
---
 pkgs/development/compilers/llvm/common/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/llvm/common/default.nix b/pkgs/development/compilers/llvm/common/default.nix
index 35525e379f2b..414313422064 100644
--- a/pkgs/development/compilers/llvm/common/default.nix
+++ b/pkgs/development/compilers/llvm/common/default.nix
@@ -1120,7 +1120,11 @@ let
                 )
                 # https://github.com/llvm/llvm-project/issues/64226
                 (metadata.getVersionFile "libcxx/0001-darwin-10.12-mbstate_t-fix.patch");
-          stdenv = overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
+          stdenv =
+            if stdenv.hostPlatform.isDarwin then
+              overrideCC darwin.bootstrapStdenv buildLlvmTools.clangWithLibcAndBasicRt
+            else
+              overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
         }
         // lib.optionalAttrs (lib.versionOlder metadata.release_version "14") {
           # TODO: remove this, causes LLVM 13 packages rebuild.