llvmPackages_13: Copy from llvmPackages_git

(cherry picked from commit f3f86d47220e2c2332d60f6bd0a89b76a628529d)

pkgs/development/compilers/llvm/13/libunwind/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, llvm_meta, version, src, cmake
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libunwind";
+  inherit version;
+
+  inherit src;
+  sourceRoot = "source/${pname}";
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [ cmake ];
+
+  cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
+
+  meta = llvm_meta // {
+    # Details: https://github.com/llvm/llvm-project/blob/main/libunwind/docs/index.rst
+    homepage = "https://clang.llvm.org/docs/Toolchain.html#unwind-library";
+    description = "LLVM's unwinder library";
+    longDescription = ''
+      The unwind library provides a family of _Unwind_* functions implementing
+      the language-neutral stack unwinding portion of the Itanium C++ ABI (Level
+      I). It is a dependency of the C++ ABI library, and sometimes is a
+      dependency of other runtimes.
+    '';
+  };
+}