From 48cdce9a790b6ba7384a36d5b4a6ffadc21a89bd Mon Sep 17 00:00:00 2001
From: Lukas W <lukaswhl@gmail.com>
Date: Tue, 28 Nov 2017 11:00:11 +0100
Subject: [PATCH] Fix compilation with MinGW versions without threads support

Older versions of MinGW don't provide std::mutex or std::thread
---
 .gitmodules                                   |  3 +++
 cmake/build_win32.sh                          |  2 +-
 plugins/vst_base/RemoteVstPlugin.cpp          |  7 ++++++-
 .../vst_base/RemoteVstPlugin/CMakeLists.txt   | 21 +++++++++++++++++++
 src/3rdparty/mingw-std-threads                |  1 +
 5 files changed, 32 insertions(+), 2 deletions(-)
 create mode 160000 src/3rdparty/mingw-std-threads

diff --git a/.gitmodules b/.gitmodules
index 94530a197..3f4859b56 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -28,3 +28,6 @@
 [submodule "src/3rdparty/weakjack/weakjack"]
 	path = src/3rdparty/weakjack/weakjack
 	url = https://github.com/x42/weakjack.git
+[submodule "src/3rdparty/mingw-std-threads"]
+	path = src/3rdparty/mingw-std-threads
+	url = https://github.com/meganz/mingw-std-threads.git
diff --git a/cmake/build_win32.sh b/cmake/build_win32.sh
index 6fbf5287b..33cd8ecce 100755
--- a/cmake/build_win32.sh
+++ b/cmake/build_win32.sh
@@ -37,4 +37,4 @@ fi
 CMAKE_OPTS="-DCMAKE_PREFIX_PATH=$MINGW $CMAKE_OPTS"
 
 # shellcheck disable=SC2086
-cmake "$DIR/.." -DCMAKE_TOOLCHAIN_FILE="$TOOLCHAIN" -DCMAKE_MODULE_PATH="$DIR/../cmake/modules/" $CMAKE_OPTS
+cmake "$DIR/.." -DCMAKE_TOOLCHAIN_FILE="$TOOLCHAIN" $CMAKE_OPTS
diff --git a/plugins/vst_base/RemoteVstPlugin.cpp b/plugins/vst_base/RemoteVstPlugin.cpp
index db5c99e8f..6110cb253 100644
--- a/plugins/vst_base/RemoteVstPlugin.cpp
+++ b/plugins/vst_base/RemoteVstPlugin.cpp
@@ -59,7 +59,12 @@
 #define USE_WS_PREFIX
 #include <windows.h>
 
-#include <mutex>
+#ifdef USE_MINGW_THREADS_REPLACEMENT
+#	include <mingw.mutex.h>
+#else
+#	include <mutex>
+#endif
+
 #include <vector>
 #include <queue>
 #include <string>
diff --git a/plugins/vst_base/RemoteVstPlugin/CMakeLists.txt b/plugins/vst_base/RemoteVstPlugin/CMakeLists.txt
index 9c43f436c..59dfd1282 100644
--- a/plugins/vst_base/RemoteVstPlugin/CMakeLists.txt
+++ b/plugins/vst_base/RemoteVstPlugin/CMakeLists.txt
@@ -4,9 +4,11 @@ project(RemoteVstPlugin
 set(CMAKE_CXX_STANDARD 11)
 
 include(CheckCXXPreprocessor)
+include(CheckCXXSourceCompiles)
 
 CHECK_CXX_DEFINE(IS_WIN "_WIN32")
 CHECK_CXX_DEFINE(IS_WIN64 "_WIN64")
+CHECK_CXX_DEFINE(IS_MINGW "__MINGW32__")
 
 if(NOT IS_WIN)
 	message(FATAL_ERROR "Toolchain used does not target windows.")
@@ -35,6 +37,25 @@ if(WIN32)
 	target_link_libraries(${EXE_NAME} Qt5::Core)
 endif()
 
+if(IS_MINGW)
+	SET(CMAKE_REQUIRED_FLAGS "-std=c++11")
+
+	CHECK_CXX_SOURCE_COMPILES("
+	#include <mutex>
+	int main(int argc, const char* argv[]) {
+		std::mutex m;
+		return 0;
+	}
+	" HAS_STD_MUTEX)
+
+	if(NOT HAS_STD_MUTEX)
+		target_include_directories(${EXE_NAME} PRIVATE
+			"${CMAKE_SOURCE_DIR}/src/3rdparty/mingw-std-threads")
+		target_compile_definitions(${EXE_NAME} PRIVATE
+			-DUSE_MINGW_THREADS_REPLACEMENT)
+	endif()
+endif()
+
 IF(STRIP)
 	ADD_CUSTOM_COMMAND(TARGET RemoteVstPlugin32 POST_BUILD COMMAND "${STRIP}" "$<TARGET_FILE:RemoteVstPlugin32>")
 ENDIF()
diff --git a/src/3rdparty/mingw-std-threads b/src/3rdparty/mingw-std-threads
new file mode 160000
index 000000000..10665829d
--- /dev/null
+++ b/src/3rdparty/mingw-std-threads
@@ -0,0 +1 @@
+Subproject commit 10665829daaedc28629e5e9b014fe498c20d73f2