diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8e01207..7be0dc57 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -183,6 +183,30 @@ if(${ASYNC_SIMPLE_BUILD_MODULES})
         endif()
     endif()
 
+    if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "16.0.0")
+            string(CONCAT CMAKE_CXX_SCANDEP_SOURCE
+            "\"${CMAKE_CXX_COMPILER_CLANG_SCAN_DEPS}\""
+            " -format=p1689"
+            " --"
+            " <CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS>"
+            " -x c++ <SOURCE> -c -o <OBJECT>"
+            " -MT <DYNDEP_FILE>"
+            " -MD -MF <DEP_FILE>"
+            # Write to a temporary file. If the scan fails, we do not want to update
+            # the actual output file as `ninja` (at least) assumes that failed
+            # commands either delete or leave output files alone. See Issue#25419.
+            " > <DYNDEP_FILE>.tmp"
+            # We cannot use `copy_if_different` as the rule does not have a feature
+            # analogous to `ninja`'s `restat = 1`. It would also leave behind the
+            # `.tmp` file.
+            " && mv <DYNDEP_FILE>.tmp <DYNDEP_FILE>")
+            set(CMAKE_CXX_MODULE_MAP_FORMAT "clang")
+            set(CMAKE_CXX_MODULE_MAP_FLAG "@<MODULE_MAP_FILE>")
+            set(CMAKE_CXX_MODULE_BMI_ONLY_FLAG "--precompile")
+        endif()
+    endif()
+
     set(CMAKE_CXX_STANDARD 20)
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
 endif()
diff --git a/async_simple/Executor.h b/async_simple/Executor.h
index cc662d16..74912a7b 100644
--- a/async_simple/Executor.h
+++ b/async_simple/Executor.h
@@ -179,7 +179,7 @@ class Executor::TimeAwaitable {
 
 Executor::TimeAwaitable inline Executor::after(Executor::Duration dur) {
     return Executor::TimeAwaitable(this, dur);
-};
+}
 
 }  // namespace async_simple
 
diff --git a/async_simple/async_simple.cppm b/async_simple/async_simple.cppm
index 20350a23..3d3a9df4 100644
--- a/async_simple/async_simple.cppm
+++ b/async_simple/async_simple.cppm
@@ -56,7 +56,6 @@ export extern "C++" {
   #include "IOExecutor.h"
   #include "coro/SharedMutex.h"
   #include "uthread/Collect.h"
-  #include "coro/PromiseAllocator.h"
   #include "executors/SimpleIOExecutor.h"
   #include "coro/Mutex.h"
   #include "Collect.h"
@@ -70,5 +69,9 @@ export extern "C++" {
   #include "coro/SyncAwait.h"
   #include "executors/SimpleExecutor.h"
   #include "coro/Semaphore.h"
+  // There are some bugs in clang lower versions.
+#if defined(__clang_major__)  && __clang_major__ >= 17
+  #include "coro/PromiseAllocator.h"
   #include "coro/Generator.h"
+#endif
 }
diff --git a/async_simple/std.mock.cppm b/async_simple/std.mock.cppm
index 85d8cd73..49d14733 100644
--- a/async_simple/std.mock.cppm
+++ b/async_simple/std.mock.cppm
@@ -38,6 +38,7 @@ module;
 #include <vector>
 #if defined(__clang__)
 #pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-warning-option"
 #pragma clang diagnostic ignored "-Wreserved-module-identifier"
 #endif
 
@@ -416,7 +417,6 @@ using std::ranges::destroy_n;
 }  // namespace ranges
 using std::default_delete;
 using std::make_unique;
-using std::make_unique_for_overwrite;
 using std::unique_ptr;
 using std::operator<;
 using std::operator>;
@@ -425,7 +425,6 @@ using std::operator>=;
 using std::operator<=>;
 using std::operator<<;
 using std::allocate_shared;
-using std::allocate_shared_for_overwrite;
 using std::atomic_compare_exchange_strong;
 using std::atomic_compare_exchange_strong_explicit;
 using std::atomic_compare_exchange_weak;
@@ -444,7 +443,6 @@ using std::enable_shared_from_this;
 using std::get_deleter;
 using std::hash;
 using std::make_shared;
-using std::make_shared_for_overwrite;
 using std::owner_less;
 using std::reinterpret_pointer_cast;
 using std::shared_ptr;
@@ -892,14 +890,8 @@ using std::atomic_fetch_xor_explicit;
 using std::atomic_flag;
 using std::atomic_flag_clear;
 using std::atomic_flag_clear_explicit;
-using std::atomic_flag_notify_all;
-using std::atomic_flag_notify_one;
-using std::atomic_flag_test;
 using std::atomic_flag_test_and_set;
 using std::atomic_flag_test_and_set_explicit;
-using std::atomic_flag_test_explicit;
-using std::atomic_flag_wait;
-using std::atomic_flag_wait_explicit;
 using std::atomic_init;
 using std::atomic_int;
 using std::atomic_int16_t;
@@ -928,7 +920,6 @@ using std::atomic_ref;
 using std::atomic_schar;
 using std::atomic_short;
 using std::atomic_signal_fence;
-using std::atomic_signed_lock_free;
 using std::atomic_size_t;
 using std::atomic_store;
 using std::atomic_store_explicit;
@@ -951,7 +942,6 @@ using std::atomic_uintmax_t;
 using std::atomic_uintptr_t;
 using std::atomic_ullong;
 using std::atomic_ulong;
-using std::atomic_unsigned_lock_free;
 using std::atomic_ushort;
 using std::atomic_wait;
 using std::atomic_wait_explicit;
@@ -1091,7 +1081,6 @@ using std::ranges::iterator_t;
 using std::ranges::output_range;
 using std::ranges::random_access_range;
 using std::ranges::range;
-using std::ranges::range_common_reference_t;
 using std::ranges::range_difference_t;
 using std::ranges::range_reference_t;
 using std::ranges::range_rvalue_reference_t;
@@ -1129,16 +1118,11 @@ using std::ranges::views::iota;
 }
 using std::ranges::basic_istream_view;
 using std::ranges::istream_view;
-using std::ranges::wistream_view;
-namespace views {
-using std::ranges::views::istream;
-}
 namespace views {
 using std::ranges::views::all;
 using std::ranges::views::all_t;
 }  // namespace views
 using std::ranges::filter_view;
-using std::ranges::owning_view;
 using std::ranges::ref_view;
 namespace views {
 using std::ranges::views::filter;
@@ -1328,7 +1312,6 @@ using std::chrono::ceil;
 using std::chrono::duration_cast;
 using std::chrono::floor;
 using std::chrono::round;
-using std::chrono::operator<<;
 using std::chrono::abs;
 using std::chrono::day;
 using std::chrono::days;
@@ -1375,7 +1358,6 @@ using std::chrono::year_month_weekday;
 using std::chrono::year_month_weekday_last;
 using std::chrono::years;
 }  // namespace chrono
-using std::formatter;
 namespace chrono {
 using std::chrono::April;
 using std::chrono::August;
diff --git a/async_simple/uthread/internal/thread.h b/async_simple/uthread/internal/thread.h
index b6622202..8558e41e 100644
--- a/async_simple/uthread/internal/thread.h
+++ b/async_simple/uthread/internal/thread.h
@@ -36,7 +36,7 @@ namespace async_simple {
 namespace uthread {
 namespace internal {
 
-static constexpr size_t default_base_stack_size = 512 * 1024;
+inline constexpr size_t default_base_stack_size = 512 * 1024;
 size_t get_base_stack_size();
 
 class thread_context {
diff --git a/async_simple/util/ThreadPool.h b/async_simple/util/ThreadPool.h
index 73e56d6f..0a00a10c 100644
--- a/async_simple/util/ThreadPool.h
+++ b/async_simple/util/ThreadPool.h
@@ -81,7 +81,7 @@ class ThreadPool {
 };
 
 #ifdef __linux__
-static void getCurrentCpus(std::vector<uint32_t> &ids) {
+inline void getCurrentCpus(std::vector<uint32_t> &ids) {
     cpu_set_t set;
     ids.clear();
     if (sched_getaffinity(0, sizeof(set), &set) == 0)