兼容gcc 10

librf/src/def.h

 #pragma once
 
-#define LIB_RESUMEF_VERSION 20907 // 2.9.7
+#define LIB_RESUMEF_VERSION 20908 // 2.9.8
 
 namespace resumef
 {

librf/src/state.h

 			//msvc认为是constexpr表达式(不写还给警告)，然而，clang不这么认为。
 			//放弃constexpr，反正合格的编译器都会优化掉这个if判断的。
 			if 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__) && !defined(__GNUC__)
 				constexpr
 #endif
 				(_offset_of(state_future_t, _is_future) - _offset_of(state_future_t, _has_value) == 1)

librf/src/unix/gcc_builtin.h

+#pragma once
+
+#if 0
+
+extern "C" void  __builtin_coro_resume(void* addr);
+extern "C" void  __builtin_coro_destroy(void* addr);
+extern "C" bool  __builtin_coro_done(void* addr);
+extern "C" void* __builtin_coro_promise(void* addr, const long unsigned int alignment, bool from_promise);
+#pragma intrinsic(__builtin_coro_resume)
+#pragma intrinsic(__builtin_coro_destroy)
+#pragma intrinsic(__builtin_coro_done)
+#pragma intrinsic(__builtin_coro_promise)
+
+#endif

tutorial/test_async_memory_layout.cpp

 
 using namespace resumef;
 
+#ifndef __GNUC__	//GCC: 没有提供__builtin_coro_frame这样的内置函数
+
 template<class _Ctype>
 static void callback_get_long(int64_t a, int64_t b, _Ctype&& cb)
 {
 	using promise_type = typename future_type::promise_type;
 	using state_type = typename future_type::state_type;
 
-	void* frame_ptr = __builtin_coro_frame();
+	void* frame_ptr = _coro_frame_ptr();
 	auto handler = coroutine_handle<promise_type>::from_address(frame_ptr);
 	promise_type* promise = &handler.promise();
 	state_type* state = handler.promise().get_state();
 	std::cout << "  future size=" << sizeof(future_type) << " / " << _Align_size<future_type>() << std::endl;
 	std::cout << "  promise size=" << sizeof(promise_type) << " / " << _Align_size<promise_type>() << std::endl;
 	std::cout << "  state size=" << sizeof(state_type) << " / "<< _Align_size<state_type>() << std::endl;
-	std::cout << "  frame size=" << __builtin_coro_size() << ", alloc size=" << state->get_alloc_size() << std::endl;
+	std::cout << "  frame size=" << _coro_frame_size() << ", alloc size=" << state->get_alloc_size() << std::endl;
 
 	std::cout << "  frame ptr=" << frame_ptr << "," << (void*)&frame_ptr << std::endl;
-	std::cout << "  frame end=" << (void*)((char*)(frame_ptr)+__builtin_coro_size()) << std::endl;
+	std::cout << "  frame end=" << (void*)((char*)(frame_ptr)+_coro_frame_size()) << std::endl;
 	std::cout << "  promise ptr=" << promise << "," << (void*)&promise << std::endl;
 	std::cout << "  handle ptr=" << handler.address() << "," << (void*)&handler << std::endl;
 	std::cout << "  state ptr=" << state << "," << (void*)&state << std::endl;
 	using promise_type = typename future_type::promise_type;
 	using state_type = typename future_type::state_type;
 
-	void* frame_ptr = __builtin_coro_frame();
+	void* frame_ptr = _coro_frame_ptr();
 	auto handler = coroutine_handle<promise_type>::from_address(frame_ptr);
 	promise_type * promise = &handler.promise();
 	state_type * state = handler.promise().get_state();
 	std::cout << "  future size=" << sizeof(future_type) << " / " << _Align_size<future_type>() << std::endl;
 	std::cout << "  promise size=" << sizeof(promise_type) << " / " << _Align_size<promise_type>() << std::endl;
 	std::cout << "  state size=" << sizeof(state_type) << " / "<< _Align_size<state_type>() << std::endl;
-	std::cout << "  frame size=" << __builtin_coro_size() << ", alloc size=" << state->get_alloc_size() << std::endl;
+	std::cout << "  frame size=" << _coro_frame_size() << ", alloc size=" << state->get_alloc_size() << std::endl;
 
 	std::cout << "  frame ptr=" << frame_ptr << ","<< (void*)&frame_ptr << std::endl;
-	std::cout << "  frame end=" << (void *)((char*)(frame_ptr) + __builtin_coro_size()) << std::endl;
+	std::cout << "  frame end=" << (void *)((char*)(frame_ptr) + _coro_frame_size()) << std::endl;
 	std::cout << "  promise ptr=" << promise << "," << (void *)&promise << std::endl;
 	std::cout << "  handle ptr=" << handler.address() << "," << (void*)&handler << std::endl;
 	std::cout << "  state ptr=" << state << "," << (void*)&state << std::endl;
 
 	std::cout << __FUNCTION__ << " - end" << std::endl;
 }
+#endif //#ifndef __GNUC__
 
 void resumable_main_layout()
 {
 	std::cout << std::endl << __FUNCTION__ << " - begin" << std::endl;
 
+#ifndef __GNUC__	//GCC: 没有提供__builtin_coro_frame这样的内置函数
 	go resumable_get_long_2(1, 2, 5);
+#endif //#ifndef __GNUC__
 	resumef::this_scheduler()->run_until_notask();
 
 	std::cout << __FUNCTION__ << " - end" << std::endl;

tutorial/test_async_routine.cpp

 
 using namespace resumef;
 
+#ifndef __GNUC__	//GCC: 没有提供__builtin_coro_frame这样的内置函数
 future_t<> test_routine_use_timer()
 {
 	using namespace std::chrono;
 	{
 		co_await resumef::sleep_for(100ms);
 		std::cout << "timer after 100ms" << std::endl;
-		std::cout << "1:frame=" << __builtin_coro_frame() << std::endl;
+		std::cout << "1:frame=" << _coro_frame_ptr() << std::endl;
 	}
 }
 
 	std::cout << "test_routine_use_timer_2" << std::endl;
 
 	co_await test_routine_use_timer();
-	std::cout << "2:frame=" << __builtin_coro_frame() << std::endl;
+	std::cout << "2:frame=" << _coro_frame_ptr() << std::endl;
 	co_await test_routine_use_timer();
-	std::cout << "2:frame=" << __builtin_coro_frame() << std::endl;
+	std::cout << "2:frame=" << _coro_frame_ptr() << std::endl;
 	co_await test_routine_use_timer();
-	std::cout << "2:frame=" << __builtin_coro_frame() << std::endl;
+	std::cout << "2:frame=" << _coro_frame_ptr() << std::endl;
 }
+#endif //#ifndef __GNUC__
 
 void resumable_main_routine()
 {
 	//go test_routine_use_timer_2();
+#ifndef __GNUC__	//GCC: 没有提供__builtin_coro_frame这样的内置函数
 	go test_routine_use_timer();
+#endif //#ifndef __GNUC__
 	this_scheduler()->run_until_notask();
 }

vs_proj/librf.vcxproj

   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>ClangCL</PlatformToolset>
     <UseDebugLibraries>true</UseDebugLibraries>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ClInclude Include="..\librf\src\timer.h" />
     <ClInclude Include="..\librf\src\unix\clang_builtin.h" />
     <ClInclude Include="..\librf\src\unix\coroutine.h" />
+    <ClInclude Include="..\librf\src\unix\gcc_builtin.h" />
     <ClInclude Include="..\librf\src\when.h" />
     <ClInclude Include="..\librf\src\when_v2.h" />
     <ClInclude Include="..\librf\src\yield.h" />

vs_proj/librf.vcxproj.filters

     <ClInclude Include="..\librf\src\config.h">
       <Filter>librf\src</Filter>
     </ClInclude>
+    <ClInclude Include="..\librf\src\unix\gcc_builtin.h">
+      <Filter>librf\src\unix</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\librf\src\asio_task_1.12.0.inl">