MacOS: Added missing system include folder for llvm 8.0.0

src/compile_commands.cc

@@ -141,11 +141,15 @@ std::vector<std::string> CompileCommands::get_arguments(const boost::filesystem:
   if(std::regex_match(clang_version_string, sm, clang_version_regex)) {
     auto clang_version = sm[1].str();
     arguments.emplace_back("-I/usr/lib/clang/" + clang_version + "/include");
-    arguments.emplace_back("-I/usr/lib64/clang/" + clang_version + "/include");  // For Fedora
-#if defined(__APPLE__) && CINDEX_VERSION_MAJOR == 0 && CINDEX_VERSION_MINOR < 32 // TODO: remove during 2018 if llvm3.7 is no longer in homebrew (CINDEX_VERSION_MINOR=32 equals clang-3.8 I think)
+    arguments.emplace_back("-I/usr/lib64/clang/" + clang_version + "/include"); // For Fedora
+#if defined(__APPLE__)
+#if CINDEX_VERSION_MAJOR == 0 && CINDEX_VERSION_MINOR < 32 // TODO: remove during 2018 if llvm3.7 is no longer in homebrew (CINDEX_VERSION_MINOR=32 equals clang-3.8 I think)
     arguments.emplace_back("-I/usr/local/Cellar/llvm/" + clang_version + "/lib/clang/" + clang_version + "/include");
-    arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1");
+    arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1");
     arguments.emplace_back("-I/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1"); //Added for OS X 10.11
+#else
+    arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1"); // Missing include folder in llvm 8.0.0
+#endif
 #endif
 #ifdef _WIN32
     auto env_msystem_prefix = std::getenv("MSYSTEM_PREFIX");