llvmPackages_{15,16,17,git}.libcxx: fix darwin link flags

This change applies the upstream PR
llvm/llvm-project#77218 so the same link flags
on darwin are used as when LIBCXX_CXX_ABI=libcxxabi. Specifically, this
adds
"-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/notweak.exp"
which prevents libcxx from segfaulting on darwin

pkgs/development/compilers/llvm/15/libcxx/default.nix

@@ -56,6 +56,14 @@ stdenv.mkDerivation rec {
       hash = "sha256-AaM9A6tQ4YAw7uDqCIV4VaiUyLZv+unwcOqbakwW9/k=";
       relative = "libcxx";
     })
+    # fix for https://github.com/NixOS/nixpkgs/issues/269548
+    # https://github.com/llvm/llvm-project/pull/77218
+    (fetchpatch {
+      name = "darwin-system-libcxxabi-link-flags.patch";
+      url = "https://github.com/llvm/llvm-project/commit/c5b89b29ee6e3c444a355fd1cf733ce7ab2e316a.patch";
+      hash = "sha256-LNoPg1KCoP8RWxU/AzHR52f4Dww24I9BGQJedMhFxyQ=";
+      relative = "libcxx";
+    })
   ] ++ lib.optionals stdenv.hostPlatform.isMusl [
     ../../libcxx-0001-musl-hacks.patch
   ];

pkgs/development/compilers/llvm/16/libcxx/default.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
+, monorepoSrc, runCommand, fetchpatch
 , cmake, ninja, python3, fixDarwinDylibNames, version
 , cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
 , libcxxabi, libcxxrt, libunwind
@@ -47,6 +47,14 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./gnu-install-dirs.patch
+    # fix for https://github.com/NixOS/nixpkgs/issues/269548
+    # https://github.com/llvm/llvm-project/pull/77218
+    (fetchpatch {
+      name = "darwin-system-libcxxabi-link-flags.patch";
+      url = "https://github.com/llvm/llvm-project/commit/c5b89b29ee6e3c444a355fd1cf733ce7ab2e316a.patch";
+      hash = "sha256-LNoPg1KCoP8RWxU/AzHR52f4Dww24I9BGQJedMhFxyQ=";
+      relative = "libcxx";
+    })
   ];
 
   postPatch = ''

pkgs/development/compilers/llvm/17/libcxx/default.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
+, monorepoSrc, runCommand, fetchpatch
 , cmake, ninja, python3, fixDarwinDylibNames, version
 , cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
 , libcxxabi, libcxxrt, libunwind
@@ -45,6 +45,17 @@ stdenv.mkDerivation rec {
     chmod -R u+w .
   '';
 
+  patches = [
+    # fix for https://github.com/NixOS/nixpkgs/issues/269548
+    # https://github.com/llvm/llvm-project/pull/77218
+    (fetchpatch {
+      name = "darwin-system-libcxxabi-link-flags.patch";
+      url = "https://github.com/llvm/llvm-project/commit/c5b89b29ee6e3c444a355fd1cf733ce7ab2e316a.patch";
+      hash = "sha256-LNoPg1KCoP8RWxU/AzHR52f4Dww24I9BGQJedMhFxyQ=";
+      relative = "libcxx";
+    })
+  ];
+
   postPatch = ''
     cd ../runtimes
   '';

pkgs/development/compilers/llvm/git/libcxx/default.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
+, monorepoSrc, runCommand, fetchpatch
 , cmake, ninja, python3, fixDarwinDylibNames, version
 , cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
 , libcxxabi, libcxxrt, libunwind
@@ -45,6 +45,17 @@ stdenv.mkDerivation rec {
     chmod -R u+w .
   '';
 
+  patches = [
+    # fix for https://github.com/NixOS/nixpkgs/issues/269548
+    # https://github.com/llvm/llvm-project/pull/77218
+    (fetchpatch {
+      name = "darwin-system-libcxxabi-link-flags.patch";
+      url = "https://github.com/llvm/llvm-project/commit/c5b89b29ee6e3c444a355fd1cf733ce7ab2e316a.patch";
+      hash = "sha256-LNoPg1KCoP8RWxU/AzHR52f4Dww24I9BGQJedMhFxyQ=";
+      relative = "libcxx";
+    })
+  ];
+
   postPatch = ''
     cd ../runtimes
   '';