From 276fe40ff34d0dcb0cf11a6f81c16fdbd6a66cd3 Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Tue, 10 Dec 2024 17:03:55 +0200
Subject: [PATCH] swift: Fix eval failure `error: expected a string but found
 null: null`
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Dunno if this is correct, there's other `hostPlatform.isDarwin`
conditionals which may be wrong.

Leaving the other conditionals to swift maintainers or people who are
interested in swift cross-compilation

```
$ nix repl --file . --system aarch64-darwin
nix-repl> pkgsCross.aarch64-multiplatform.swift
«derivation /nix/store/kqbaqwdfc9g0yvkq4ffrlqspranprlmy-swift-wrapper-aarch64-unknown-linux-gnu-5.8.drv»

nix-repl> pkgsCross.aarch64-multiplatform.buildPackages.swift
error:
       error: expected a string but found null: null
       at /home/artturin/nixgits/my-nixpkgs/.worktree/2/pkgs/development/compilers/swift/compiler/default.nix:586:11:
          585|         #WATCHOS_SIMULATOR
          586|       }.${targetPlatform.darwinPlatform}}
             |           ^
          587|
```
---
 pkgs/development/compilers/swift/compiler/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/swift/compiler/default.nix b/pkgs/development/compilers/swift/compiler/default.nix
index 8e8cf798db4f2..b8a4159003222 100644
--- a/pkgs/development/compilers/swift/compiler/default.nix
+++ b/pkgs/development/compilers/swift/compiler/default.nix
@@ -541,7 +541,7 @@ in stdenv.mkDerivation {
     ";
     buildProject lldb llvm-project/lldb
 
-    ${lib.optionalString stdenv.hostPlatform.isDarwin ''
+    ${lib.optionalString stdenv.targetPlatform.isDarwin ''
     # Need to do a standalone build of concurrency for Darwin back deployment.
     # Based on: utils/swift_build_support/swift_build_support/products/backdeployconcurrency.py
     cmakeFlags="