From 04b49f4e8d44ccd9f13b58ac4c31f8af4c28d4a1 Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Wed, 9 Apr 2025 15:25:59 +0100
Subject: [PATCH] apple-sdk: add hack for C++ issues on `x86_64-darwin`

---
 .../ap/apple-sdk/common/process-stubs.nix        | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/pkgs/by-name/ap/apple-sdk/common/process-stubs.nix b/pkgs/by-name/ap/apple-sdk/common/process-stubs.nix
index 1720d9f27cd7..0f87f9c326bd 100644
--- a/pkgs/by-name/ap/apple-sdk/common/process-stubs.nix
+++ b/pkgs/by-name/ap/apple-sdk/common/process-stubs.nix
@@ -38,5 +38,21 @@ self: super: {
         llvm-readtapi --filetype=tbd-v4 usr/lib/$libSystem~ -o usr/lib/$libSystem
         rm usr/lib/$libSystem~
       done
+
+      # Strip weak C++ symbols to work around `libc++` leakage in system
+      # frameworks for now. These are only present on `x86_64-darwin`, so
+      # it should hopefully be harmless.
+      #
+      # TODO FIXME: This is kind of horrible.
+      while read -r -d "" stub; do
+        printf 'Stripping weak C++ symbols from %s\n' "$stub"
+        llvm-readtapi --filetype=tbd-v5 "$stub" \
+        | jq '
+          (.main_library, .libraries[]?).exported_symbols[]?.data.weak[]? |=
+            select(startswith("__Z") | not)
+        ' > $stub~
+        llvm-readtapi --filetype=tbd-v4 $stub~ -o $stub
+        rm $stub~
+      done < <(find . -name '*.tbd' -print0)
     '';
 }