From 67915acae1b8a3a234f06c46a0a293b834e8c03e Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Tue, 26 Nov 2024 21:11:46 -0500
Subject: [PATCH] libffi: use darwin.libffi on Darwin

---
 pkgs/top-level/all-packages.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4182436fa084..2f5a47a8cb58 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9642,7 +9642,12 @@ with pkgs;
     python = python3;
   };
 
-  libffi = callPackage ../development/libraries/libffi { };
+  # Use Apple’s fork of libffi by default, which provides APIs and trampoline functionality that is not yet
+  # merged upstream. This is needed by some packages (such as cffi).
+  #
+  # `libffiReal` is provided in case the upstream libffi package is needed on Darwin instead of the fork.
+  libffiReal = callPackage ../development/libraries/libffi { };
+  libffi = if stdenv.hostPlatform.isDarwin then darwin.libffi else libffiReal;
   libffi_3_3 = callPackage ../development/libraries/libffi/3.3.nix { };
   libffiBoot = libffi.override {
     doCheck = false;