clang-tools, perhaps

pkgs/clang-tools.nix

@@ -0,0 +1,15 @@
+with import <nixpkgs> {};
+runCommand "clang-tools" {} ''
+  mkdir -p $out/bin
+  for file in ${clang-tools}/bin/*; do
+    if [ $(basename "$file") != "clangd" ]; then
+      ln -s "$file" $out/bin
+    fi
+  done
+
+  sed \
+    -e "18iexport CPLUS_INCLUDE_PATH=${llvmPackages.libcxx}/include/c++/v1\\''${CPATH:+':'}\\''${CPATH}" \
+    -e '/CPLUS_INCLUDE_PATH/d' \
+      < ${clang-tools}/bin/clangd \
+      > $out/bin/clangd
+''

pkgs/clang-tools/default.nix

@@ -0,0 +1,24 @@
+{ pkgs }:
+with pkgs;
+
+runCommand "clang-tools" {} ''
+  mkdir -p $out/bin
+  export libc_includes="${stdenv.lib.getDev stdenv.cc.libc}/include"
+  export libcpp_includes="${llvmPackages.libcxx}/include/c++/v1"
+
+  export clang=${llvmPackages.clang-unwrapped}
+
+  echo $clang
+
+  substituteAll ${./wrapper} $out/bin/clangd
+  chmod +x $out/bin/clangd
+  for tool in \
+    clang-apply-replacements \
+    clang-check \
+    clang-format \
+    clang-rename \
+    clang-tidy
+  do
+    ln -s $out/bin/clangd $out/bin/$tool
+  done
+''

pkgs/clang-tools/wrapper

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+buildcpath() {
+  local path
+  while (( $# )); do
+    case $1 in
+        -isystem)
+            shift
+            path=$path${path:+':'}$1
+    esac
+    shift
+  done
+  echo $path
+}
+
+export CPATH=${CPATH}${CPATH:+':'}$(buildcpath ${NIX_CFLAGS_COMPILE})
+export CPATH=${CPATH}${CPATH:+':'}@libc_includes@
+export CPLUS_INCLUDE_PATH=@libcpp_includes@${CPATH:+':'}${CPATH}
+
+exec -a "$0" @clang@/bin/$(basename $0) "$@"