Fix libcds on MinGW

cmake/modules/DetectMachine.cmake

@@ -1,3 +1,5 @@
+INCLUDE(CheckCXXSourceCompiles)
+
 IF(WIN32)
 	SET(LMMS_BUILD_WIN32 1)
 ELSEIF(APPLE)
@@ -86,3 +88,27 @@ IF(LMMS_BUILD_APPLE)
 	STRING(REGEX REPLACE "\\.[0-9]*$" "" APPLE_OS_VER "${APPLE_OS_VER}")
 	SET(CMAKE_MACOSX_RPATH 1)	
 ENDIF()
+
+# Detect MinGW
+IF(WIN32 AND CMAKE_COMPILER_IS_GNUCXX)
+	SET(MINGW TRUE)
+ENDIF()
+
+# Detect MINGW thread support
+IF(MINGW)
+	CHECK_CXX_SOURCE_COMPILES("
+	#include <mutex>
+	#include <thread>
+	int main(int argc, const char* argv[]) {
+		std::mutex m;
+		std::this_thread::yield();
+		return 0;
+	}
+	" HAS_STD_THREADS)
+	IF(NOT HAS_STD_THREADS)
+		SET(NEED_MINGW_THREADS_REPLACEMENT TRUE)
+	ELSE()
+		SET(NEED_MINGW_THREADS_REPLACEMENT FALSE)
+	ENDIF()
+	MESSAGE(NEED_MINGW_THREADS_REPLACEMENT ${NEED_MINGW_THREADS_REPLACEMENT})
+ENDIF()

cmake/toolchains/common/Ubuntu-MinGW-W64.cmake

@@ -5,13 +5,16 @@ set(CMAKE_C_COMPILER      ${TOOLCHAIN_PREFIX}-gcc)
 set(CMAKE_CXX_COMPILER    ${TOOLCHAIN_PREFIX}-g++)
 set(CMAKE_RC_COMPILER     ${TOOLCHAIN_PREFIX}-windres)
 
-set(CMAKE_FIND_ROOT_PATH  /usr/${TOOLCHAIN_PREFIX})
+set(MINGW_PREFIX          /usr/${TOOLCHAIN_PREFIX})
+
+set(CMAKE_FIND_ROOT_PATH  ${MINGW_PREFIX})
 SET(ENV{PKG_CONFIG}       /usr/bin/${TOOLCHAIN_PREFIX}-pkg-config)
 
 IF(WIN64)
 	SET(TOOLCHAIN_PREFIX32   ${CMAKE_SYSTEM_PROCESSOR32}-w64-mingw32)
 	SET(CMAKE_C_COMPILER32   ${TOOLCHAIN_PREFIX32}-gcc)
 	SET(CMAKE_CXX_COMPILER32 ${TOOLCHAIN_PREFIX32}-g++)
+	set(MINGW_PREFIX32       /usr/${TOOLCHAIN_PREFIX32})
 ENDIF()
 
 INCLUDE(${CMAKE_CURRENT_LIST_DIR}/WinCrossCompile.cmake)