diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fe920cd..84334a9a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,11 +85,12 @@ if(NOT SYSTEM_CLANG)
 
   if(${CMAKE_CXX_COMPILER_ID} STREQUAL Clang AND CLANG_USE_BUNDLED_LIBC++)
     message(STATUS "Using bundled libc++")
-    target_compile_options(ccls PRIVATE -stdlib=libc++)
-    target_include_directories(ccls PRIVATE ${CLANG_ROOT}/include/c++/v1)
-    target_link_libraries(ccls PRIVATE ${CLANG_ROOT}/lib/libc++.a
-                                       ${CLANG_ROOT}/lib/libc++abi.a
-                                       ${CLANG_ROOT}/lib/libc++experimental.a)
+    target_compile_options(ccls PRIVATE -nostdinc++ -cxx-isystem ${CLANG_ROOT}/include/c++/v1)
+    target_link_libraries(ccls PRIVATE -stdlib=libc++ -L${CLANG_ROOT}/lib -lc++experimental)
+    if(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
+      # FreeBSD uses system libcxxrt.a and does not need libc++abi.
+      target_link_libraries(ccls PRIVATE c++abi)
+    endif()
   endif()
 
 else()
@@ -107,15 +108,13 @@ set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 target_link_libraries(ccls PRIVATE Threads::Threads)
 
-if(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
-  target_link_libraries(ccls PRIVATE -lstdc++fs)
-elseif(MSVC)
-else()
-  # e.g. Darwin, FreeBSD
+if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
   target_link_libraries(ccls PRIVATE -lc++experimental)
-endif()
 
-if(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
+elseif(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
+  if(NOT CLANG_USE_BUNDLED_LIBC++)
+    target_link_libraries(ccls PRIVATE -lstdc++fs)
+  endif()
   # loguru calls dladdr
   target_link_libraries(ccls PRIVATE ${CMAKE_DL_LIBS})
 
@@ -125,6 +124,9 @@ elseif(${CMAKE_SYSTEM_NAME} STREQUAL FreeBSD)
   # src/platform_posix.cc uses libthr
   find_package(Backtrace REQUIRED)
   target_link_libraries(ccls PRIVATE ${Backtrace_LIBRARIES} kvm thr)
+  if(SYSTEM_CLANG)
+    target_link_libraries(ccls PRIVATE c++experimental)
+  endif()
 
 elseif(${CMAKE_SYSTEM_NAME} STREQUAL Windows)
   # sparsepp/spp_memory.h uses LibPsapi
diff --git a/src/fuzzy_match.cc b/src/fuzzy_match.cc
index 49b45de1..1d5d6058 100644
--- a/src/fuzzy_match.cc
+++ b/src/fuzzy_match.cc
@@ -121,7 +121,7 @@ int FuzzyMatcher::Match(std::string_view text) {
                                                pat[i] == text[j]))
                           ? std::max(pre[j][0] + MatchScore(i, j, false),
                                      pre[j][1] + MatchScore(i, j, true))
-                          : cur[j + 1][1] = kMinScore * 2;
+                          : kMinScore * 2;
     }
   }
 
diff --git a/src/port.h b/src/port.h
index d50e597b..da3da313 100644
--- a/src/port.h
+++ b/src/port.h
@@ -12,6 +12,8 @@
 
 #ifdef __clang__
 #define GUARDED_BY(x)  __attribute__((guarded_by(x)))
+#else
+#define GUARDED_BY(x)
 #endif
 
 // TODO GCC
diff --git a/src/project.cc b/src/project.cc
index df568423..77a8273d 100644
--- a/src/project.cc
+++ b/src/project.cc
@@ -69,7 +69,7 @@ std::vector<std::string> kBlacklist = {
 // Arguments which are followed by a potentially relative path. We need to make
 // all relative paths absolute, otherwise libclang will not resolve them.
 std::vector<std::string> kPathArgs = {
-    "-I",        "-iquote",        "-isystem",     "--sysroot=",
+    "-I",        "-iquote",        "-cxx-isystem", "-isystem",     "--sysroot=",
     "-isysroot", "-gcc-toolchain", "-include-pch", "-iframework",
     "-F",        "-imacros",       "-include",     "/I",
     "-idirafter"};
@@ -82,7 +82,7 @@ std::vector<std::string> kNormalizePathArgs = {"--sysroot="};
 // Arguments whose path arguments should be injected into include dir lookup
 // for #include completion.
 std::vector<std::string> kQuoteIncludeArgs = {"-iquote", "-I", "/I"};
-std::vector<std::string> kAngleIncludeArgs = {"-isystem", "-I", "/I"};
+std::vector<std::string> kAngleIncludeArgs = {"-cxx-isystem", "-isystem", "-I", "/I"};
 
 bool ShouldAddToQuoteIncludes(const std::string& arg) {
   return StartsWithAny(arg, kQuoteIncludeArgs);
@@ -152,16 +152,6 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
   for (; i < args.size(); ++i) {
     std::string arg = args[i];
 
-    // If blacklist skip.
-    if (!next_flag_is_path) {
-      if (StartsWithAny(arg, kBlacklistMulti)) {
-        ++i;
-        continue;
-      }
-      if (StartsWithAny(arg, kBlacklist))
-        continue;
-    }
-
     // Finish processing path for the previous argument, which was a switch.
     // {"-I", "foo"} style.
     if (next_flag_is_path) {
@@ -177,6 +167,12 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
       add_next_flag_to_quote_dirs = false;
       add_next_flag_to_angle_dirs = false;
     } else {
+      // If blacklist skip.
+      if (StartsWithAny(arg, kBlacklistMulti)) {
+        i++;
+        continue;
+      }
+
       // Check to see if arg is a path and needs to be updated.
       for (const std::string& flag_type : kPathArgs) {
         // {"-I", "foo"} style.
@@ -184,7 +180,7 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
           next_flag_is_path = true;
           add_next_flag_to_quote_dirs = ShouldAddToQuoteIncludes(arg);
           add_next_flag_to_angle_dirs = ShouldAddToAngleIncludes(arg);
-          break;
+          goto done;
         }
 
         // {"-Ifoo"} style.
@@ -198,10 +194,13 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
             config->quote_dirs.insert(path);
           if (ShouldAddToAngleIncludes(flag_type))
             config->angle_dirs.insert(path);
-          break;
+          goto done;
         }
       }
 
+      if (StartsWithAny(arg, kBlacklist))
+        continue;
+
       // This is most likely the file path we will be passing to clang. The
       // path needs to be absolute, otherwise clang_codeCompleteAt is extremely
       // slow. See
@@ -215,6 +214,7 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
         continue;
     }
 
+  done:
     result.args.push_back(arg);
   }
 
diff --git a/src/query.cc b/src/query.cc
index 49b7a893..036f85e2 100644
--- a/src/query.cc
+++ b/src/query.cc
@@ -5,13 +5,12 @@
 #include "serializers/json.h"
 
 #include <doctest/doctest.h>
-#include <optional>
 #include <loguru.hpp>
 
 #include <cassert>
 #include <cstdint>
 #include <functional>
-#include <iterator>
+#include <optional>
 #include <string>
 #include <unordered_map>
 #include <unordered_set>