Remove MinGW support

The Issue
=======

For a long time now MinGW has been unsupported and unmaintained and at this point,
it looks like something that we should just leave behind and move on.


Why Remove
==========

One of the big motivations for MinGW back in the day is that it was free compared to MSVC which was licensed based.
However, now that this is no longer true we have basically stopped updating the need CMake files.
Along with the CMake files, there are several patches to the extern libs needed to make this work.  For example, see:
https://developer.blender.org/diffusion/B/browse/master/extern/carve/patches/mingw_w64.patch

If we wanted to keep MinGW then we would need to make more custom patches to the external libs and
this is not something our platform maintainers are willing to do.

For example, here is the patches needed to build python: https://github.com/Alexpux/MINGW-packages/tree/master/mingw-w64-python3

Fixes T51301

Differential Revision: https://developer.blender.org/D2648

1 files changed, 21 insertions, 110 deletions

diff --git a/source/creator/CMakeLists.txt b/source/creator/CMakeLists.txt
index 7a34f8bcb69..8f26e248424 100644
--- a/source/creator/CMakeLists.txt
+++ b/source/creator/CMakeLists.txt
@@ -113,24 +113,13 @@ if(WIN32 AND NOT UNIX)
 	string(SUBSTRING ${BLENDER_VERSION} 0 1 bver1)
 	string(SUBSTRING ${BLENDER_VERSION} 2 1 bver2)
 	string(SUBSTRING ${BLENDER_VERSION} 3 1 bver3)
-	if(MINGW)
-		add_definitions(
-			-DWINDRES
-			-DBLEN_VER_RC_STR_M=${BLENDER_VERSION}
-			-DBLEN_VER_RC_1=${bver1}
-			-DBLEN_VER_RC_2=${bver2}
-			-DBLEN_VER_RC_3=${bver3}
-			-DBLEN_VER_RC_4=0
-		)
-	else()
-		add_definitions(
-			-DBLEN_VER_RC_STR=${BLENDER_VERSION}
-			-DBLEN_VER_RC_1=${bver1}
-			-DBLEN_VER_RC_2=${bver2}
-			-DBLEN_VER_RC_3=${bver3}
-			-DBLEN_VER_RC_4=0
-		)
-	endif()
+	add_definitions(
+		-DBLEN_VER_RC_STR=${BLENDER_VERSION}
+		-DBLEN_VER_RC_1=${bver1}
+		-DBLEN_VER_RC_2=${bver2}
+		-DBLEN_VER_RC_3=${bver3}
+		-DBLEN_VER_RC_4=0
+	)
 
 
 	list(APPEND SRC
@@ -652,7 +641,6 @@ elseif(WIN32)
 	if(WITH_PYTHON)
 		string(REPLACE "." "" _PYTHON_VERSION_NO_DOTS ${PYTHON_VERSION})
 
-		# MinGW TODO: This bit of Python configuration diverges from MSVC
 		if(NOT CMAKE_COMPILER_IS_GNUCC)
 			install(
 				FILES ${LIBDIR}/python/lib/python${_PYTHON_VERSION_NO_DOTS}.dll
@@ -749,20 +737,6 @@ elseif(WIN32)
 				DESTINATION ${BLENDER_VERSION}/python/bin
 				CONFIGURATIONS Debug
 			)
-
-			# MinGW needs Python DLL
-			if(MINGW)
-				install(
-					FILES ${LIBDIR}/python/lib/python${_PYTHON_VERSION_NO_DOTS}.dll
-					DESTINATION "."
-					CONFIGURATIONS Release;RelWithDebInfo;MinSizeRel
-				)
-				install(
-					FILES ${LIBDIR}/python/lib/python${_PYTHON_VERSION_NO_DOTS}_d.dll
-					DESTINATION "."
-					CONFIGURATIONS Debug
-				)
-			endif()
 		endif()
 
 		unset(_PYTHON_VERSION_NO_DOTS)
@@ -785,57 +759,19 @@ elseif(WIN32)
 			FILES ${LIBDIR}/pthreads/lib/pthreadVC2.dll
 			DESTINATION "."
 		)
-	else()
-		#MinGW64 comes with own version. For portable builds it will probaly have to be copied to work
-		if(NOT WITH_MINGW64)
-			install(
-				FILES ${LIBDIR}/pthreads/lib/pthreadGC2.dll
-				DESTINATION "."
-			)
-		elseif(WITH_MINGW64)
-			install(
-				FILES 
-					${LIBDIR}/binaries/libgcc_s_sjlj-1.dll
-					${LIBDIR}/binaries/libwinpthread-1.dll
-					${LIBDIR}/binaries/libstdc++-6.dll
-				DESTINATION "."
-			)
-			
-			if(WITH_OPENMP)
-				install(
-					FILES 
-					${LIBDIR}/binaries/libgomp-1.dll
-					DESTINATION "."
-				)
-			endif()
-		endif()
 	endif()
 
 	if(WITH_CODEC_FFMPEG)
-		if(WITH_MINGW64)
-			install(
-				FILES
-					${LIBDIR}/ffmpeg/lib/avcodec-53.dll
-					${LIBDIR}/ffmpeg/lib/avformat-53.dll
-					${LIBDIR}/ffmpeg/lib/avdevice-53.dll
-					${LIBDIR}/ffmpeg/lib/avutil-51.dll
-					${LIBDIR}/ffmpeg/lib/swscale-2.dll
-					${LIBDIR}/ffmpeg/lib/swresample-0.dll
-					${LIBDIR}/ffmpeg/lib/xvidcore.dll
-				DESTINATION "."
-			)
-		else()
-			install(
-				FILES
-					${LIBDIR}/ffmpeg/lib/avcodec-57.dll
-					${LIBDIR}/ffmpeg/lib/avformat-57.dll
-					${LIBDIR}/ffmpeg/lib/avdevice-57.dll
-					${LIBDIR}/ffmpeg/lib/avutil-55.dll
-					${LIBDIR}/ffmpeg/lib/swscale-4.dll
-					${LIBDIR}/ffmpeg/lib/swresample-2.dll
-				DESTINATION "."
-			)
-		endif()
+		install(
+			FILES
+				${LIBDIR}/ffmpeg/lib/avcodec-57.dll
+				${LIBDIR}/ffmpeg/lib/avformat-57.dll
+				${LIBDIR}/ffmpeg/lib/avdevice-57.dll
+				${LIBDIR}/ffmpeg/lib/avutil-55.dll
+				${LIBDIR}/ffmpeg/lib/swscale-4.dll
+				${LIBDIR}/ffmpeg/lib/swresample-2.dll
+			DESTINATION "."
+		)
 	endif()
 
 	if(WITH_CODEC_SNDFILE)
@@ -851,30 +787,13 @@ elseif(WIN32)
 				${LIBDIR}/openal/lib/OpenAL32.dll
 			DESTINATION "."
 		)
-		# MinGW TODO: Need to update to a newer OpenAL version
-		# which does not depend on wrap_oal.dll
-		if(CMAKE_COMPILER_IS_GNUCC)
-			install(
-				FILES
-					${LIBDIR}/openal/lib/wrap_oal.dll
-				DESTINATION "."
-			)
-		endif()
 	endif()
 
 	if(WITH_SDL)
-		#MinGW TODO: Update to SDL2
-		if(NOT CMAKE_COMPILER_IS_GNUCC)
-			install(
-				FILES ${LIBDIR}/sdl/lib/SDL2.dll
-				DESTINATION "."
-			)
-		else()
-			install(
-				FILES ${LIBDIR}/sdl/lib/SDL.dll
-				DESTINATION "."
-			)
-		endif()
+		install(
+			FILES ${LIBDIR}/sdl/lib/SDL2.dll
+			DESTINATION "."
+		)
 	endif()
 	
 	if(WITH_SYSTEM_AUDASPACE)
@@ -901,19 +820,11 @@ elseif(WIN32)
 
 	if(WITH_OPENCOLORIO)
 		set(OCIOBIN ${LIBDIR}/opencolorio/bin)
-		if(NOT MINGW)
 			install(
 				FILES
 					${OCIOBIN}/OpenColorIO.dll
 				DESTINATION "."
 			)
-		else()
-			install(
-				FILES
-					${OCIOBIN}/libOpenColorIO.dll
-				DESTINATION "."
-			)
-		endif()
 	endif()
 
 elseif(APPLE)