Fix libcds on MinGW

Author: lukas-w

.gitmodules

@@ -34,3 +34,6 @@
 [submodule "src/3rdparty/libcds"]
 	path = src/3rdparty/libcds
 	url = https://github.com/khizmax/libcds.git
+[submodule "src/3rdparty/mingw-std-threads"]
+	path = src/3rdparty/mingw-std-threads
+	url = https://github.com/meganz/mingw-std-threads.git

CMakeLists.txt

@@ -147,6 +147,8 @@ INCLUDE_DIRECTORIES(
 	${Qt5Xml_INCLUDE_DIRS}
 )
 
+INCLUDE_DIRECTORIES("${CMAKE_SOURCE_DIR}/src/3rdparty/mingw-std-threads")
+
 SET(QT_LIBRARIES
 	Qt5::Core
 	Qt5::Gui

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  ${MINGW_PREFIX})
 SET(PKG_CONFIG_EXECUTABLE /usr/bin/${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)

include/libcds.h

@@ -1,7 +1,14 @@
 #pragma once
 
+#include <thread>
+
 #include "NiftyCounter.h"
 
+#if defined(__MINGW32__) && !defined(_GLIBCXX_HAS_GTHREADS)
+#	include "mingw-std-threads/thread"
+#	include "mingw-std-threads/mutex"
+#endif
+
 namespace _cdslib
 {
 	void init();

include/mingw-std-threads/mutex

@@ -0,0 +1 @@
+#include "mingw.mutex.h"

include/mingw-std-threads/thread

@@ -0,0 +1 @@
+#include "mingw.thread.h"

plugins/CMakeLists.txt

@@ -9,6 +9,13 @@ IF(LMMS_BUILD_APPLE)
 	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
 ENDIF()
 
+IF(MINGW_PREFIX)
+	# There's a bug in some CMake or MinGW versions that passes -std=c++11 when
+	# compiling C files (e.g. fmopl.c). Remove -Werror for plugins to work
+	# around this.
+	STRING(REPLACE "-Werror " "" CMAKE_C_FLAGS ${CMAKE_C_FLAGS})
+ENDIF()
+
 INCLUDE_DIRECTORIES(
 	${SAMPLERATE_INCLUDE_DIRS}
 	"${CMAKE_BINARY_DIR}/src"

src/3rdparty/CMakeLists.txt

@@ -11,4 +11,53 @@ ENDIF()
 ADD_SUBDIRECTORY(rpmalloc)
 ADD_SUBDIRECTORY(weakjack)
 
-ADD_SUBDIRECTORY(libcds)
+IF(WIN32 AND CMAKE_COMPILER_IS_GNUCXX)
+	SET(MINGW TRUE)
+ENDIF()
+
+IF(MINGW)
+	# Work around linking errors with MinGW
+	SET(CDS_LIBRARY_TYPE SHARED)
+ELSE()
+	SET(CDS_LIBRARY_TYPE STATIC)
+ENDIF()
+
+ADD_LIBRARY(cds ${CDS_LIBRARY_TYPE}
+	libcds/src/init.cpp
+	libcds/src/hp.cpp
+	libcds/src/dhp.cpp
+	libcds/src/urcu_gp.cpp
+	libcds/src/urcu_sh.cpp
+	libcds/src/thread_data.cpp
+	libcds/src/topology_hpux.cpp
+	libcds/src/topology_linux.cpp
+	libcds/src/topology_osx.cpp
+	libcds/src/dllmain.cpp
+)
+SET_TARGET_PROPERTIES(cds PROPERTIES
+	CXX_STANDARD 11
+	CXX_STANDARD_REQUIRED ON
+)
+TARGET_INCLUDE_DIRECTORIES(cds
+	PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/libcds"
+)
+
+IF(NEED_MINGW_THREADS_REPLACEMENT)
+	# Provide win32 threads implementation
+	TARGET_INCLUDE_DIRECTORIES(cds BEFORE
+		PRIVATE "${CMAKE_SOURCE_DIR}/include/mingw-std-threads"
+		PUBLIC  "${CMAKE_CURRENT_SOURCE_DIR}/mingw-std-threads"
+	)
+ENDIF()
+
+IF(CDS_LIBRARY_TYPE STREQUAL "STATIC")
+	TARGET_COMPILE_DEFINITIONS(cds
+		PRIVATE CDS_BUILD_STATIC_LIB
+	)
+ELSE()
+	TARGET_COMPILE_DEFINITIONS(cds
+		PRIVATE CDS_BUILD_LIB
+	)
+	# Install DLL
+	install(TARGETS cds RUNTIME DESTINATION .)
+ENDIF()

src/CMakeLists.txt

@@ -165,7 +165,7 @@ SET(LMMS_REQUIRED_LIBS ${LMMS_REQUIRED_LIBS}
 	${SNDFILE_LIBRARIES}
 	${EXTRA_LIBRARIES}
 	rpmalloc
-	cds-s
+	cds
 )
 
 # Expose required libs for tests binary