From be4eb91b3c53d985255216a7bc924ced88699135 Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Thu, 15 Apr 2021 11:47:39 +0200
Subject: [PATCH] llvmPackages_7.libunwind: init at 7.1.0

---
 pkgs/development/compilers/llvm/7/default.nix |  6 ++++
 .../compilers/llvm/7/libunwind/default.nix    | 33 +++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 pkgs/development/compilers/llvm/7/libunwind/default.nix

diff --git a/pkgs/development/compilers/llvm/7/default.nix b/pkgs/development/compilers/llvm/7/default.nix
index 2170177117e..5ae5f9ecb20 100644
--- a/pkgs/development/compilers/llvm/7/default.nix
+++ b/pkgs/development/compilers/llvm/7/default.nix
@@ -181,6 +181,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
+    libunwind = callPackage ./libunwind ({
+      inherit (buildLlvmTools) llvm;
+    } // lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
+      stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
+    });
+
     openmp = callPackage ./openmp.nix {};
   });
 
diff --git a/pkgs/development/compilers/llvm/7/libunwind/default.nix b/pkgs/development/compilers/llvm/7/libunwind/default.nix
new file mode 100644
index 00000000000..8fb6e2c7b6d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/libunwind/default.nix
@@ -0,0 +1,33 @@
+{ lib, stdenv, version, fetch, fetchpatch, cmake, llvm, libcxx
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+stdenv.mkDerivation {
+  pname = "libunwind";
+  inherit version;
+
+  src = fetch "libunwind" "035dsxs10nyiqd00q07yycvmkjl01yz4jdlrjvmch8klxg4pyjhp";
+
+  patches = lib.optional (stdenv.hostPlatform.useLLVM or false) [
+    # removes use of `new` that require libc++
+    (fetchpatch {
+      url = "https://github.com/llvm-mirror/libunwind/commit/34a45c630d4c79af403661d267db42fbe7de1178.patch";
+      sha256 = "0n0pv6jvcky8pn3srhrf9x5kbnd0d2kia9xlx2g590f5q0bgwfhv";
+    })
+    # cleans up remaining libc++ dependencies (mostly header inclusions)
+    (fetchpatch {
+      url = "https://github.com/llvm-mirror/libunwind/commit/e050272d2eb57eb4e56a37b429a61df2ebb8aa3e.patch";
+      sha256 = "170mwmj0wf40iyk1kzdpaiy36rz9n8dpl881h4h7s5da0rh51xya";
+      includes = [ "src/libunwind.cpp" "src/UnwindCursor.hpp" ];
+    })
+  ];
+
+  nativeBuildInputs = [ cmake llvm ];
+
+  cmakeFlags = lib.optionals (!enableShared) [
+    "-DLIBUNWIND_ENABLE_SHARED=OFF"
+  ] ++ lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLIBUNWIND_HAS_NOSTDINCXX_FLAG=ON"
+    "-DLLVM_ENABLE_LIBCXX=ON"
+  ];
+}