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

11 files changed, 13 insertions, 59 deletions

diff --git a/intern/dualcon/intern/Projections.h b/intern/dualcon/intern/Projections.h
index 2d1eca55997..2d245a77d15 100644
--- a/intern/dualcon/intern/Projections.h
+++ b/intern/dualcon/intern/Projections.h
@@ -29,7 +29,7 @@
 #define CONTAINS_INDEX
 #define GRID_DIMENSION 20
 
-#if defined(_WIN32) && !defined(__MINGW32__) && !(_MSC_VER >= 1900)
+#if defined(_WIN32) && !(_MSC_VER >= 1900)
 #define isnan(n) _isnan(n)
 #define LONG __int64
 #define int64_t __int64
diff --git a/intern/dualcon/intern/dualcon_c_api.cpp b/intern/dualcon/intern/dualcon_c_api.cpp
index e55de2ed354..92f8b0cfd1a 100644
--- a/intern/dualcon/intern/dualcon_c_api.cpp
+++ b/intern/dualcon/intern/dualcon_c_api.cpp
@@ -28,7 +28,7 @@
 #include <cstdio>
 #include <float.h>
 
-#if defined(_WIN32) && !defined(__MINGW32__)
+#if defined(_WIN32)
 #define isnan(n) _isnan(n)
 #endif
 
diff --git a/intern/elbeem/intern/mvmcoords.h b/intern/elbeem/intern/mvmcoords.h
index 56d991aac6e..deeedcf9dd4 100644
--- a/intern/elbeem/intern/mvmcoords.h
+++ b/intern/elbeem/intern/mvmcoords.h
@@ -23,12 +23,10 @@
 #define mvmFloat double
 
 #ifdef WIN32
-#ifndef FREE_WINDOWS
 #include "float.h"
 #define isnan(n) _isnan(n)
 #define finite _finite
 #endif
-#endif
 
 #ifdef sun
 #include "ieeefp.h"
diff --git a/intern/ghost/intern/GHOST_Context.cpp b/intern/ghost/intern/GHOST_Context.cpp
index f69f2181ef7..72db17c4f56 100644
--- a/intern/ghost/intern/GHOST_Context.cpp
+++ b/intern/ghost/intern/GHOST_Context.cpp
@@ -38,7 +38,7 @@
 #  include <tchar.h>
 #
 #  ifndef ERROR_PROFILE_DOES_NOT_MATCH_DEVICE
-#    define ERROR_PROFILE_DOES_NOT_MATCH_DEVICE 0x7E7 // Mingw64 headers may have had this
+#    define ERROR_PROFILE_DOES_NOT_MATCH_DEVICE 0x7E7
 #  endif
 #endif
 
diff --git a/intern/ghost/intern/GHOST_DisplayManagerWin32.cpp b/intern/ghost/intern/GHOST_DisplayManagerWin32.cpp
index 252ea775329..7b9a897fe57 100644
--- a/intern/ghost/intern/GHOST_DisplayManagerWin32.cpp
+++ b/intern/ghost/intern/GHOST_DisplayManagerWin32.cpp
@@ -41,9 +41,7 @@
 
 // We do not support multiple monitors at the moment
 #define COMPILE_MULTIMON_STUBS
-#ifndef FREE_WINDOWS
 #include <multimon.h>
-#endif
 
 
 GHOST_DisplayManagerWin32::GHOST_DisplayManagerWin32(void)
diff --git a/intern/ghost/intern/GHOST_SystemPathsWin32.cpp b/intern/ghost/intern/GHOST_SystemPathsWin32.cpp
index 7d0ce5158fe..8056bc76edb 100644
--- a/intern/ghost/intern/GHOST_SystemPathsWin32.cpp
+++ b/intern/ghost/intern/GHOST_SystemPathsWin32.cpp
@@ -37,30 +37,6 @@
 #include <shlobj.h>
 #include "utfconv.h"
 
-#ifdef __MINGW32__
-
-#if !defined(SHARD_PIDL)
-#define SHARD_PIDL      0x00000001L
-#endif
-
-#if !defined(SHARD_PATHA)
-#define SHARD_PATHA     0x00000002L
-#endif
-
-#if !defined(SHARD_PATHW)
-#define SHARD_PATHW     0x00000003L
-#endif
-
-#if !defined(SHARD_PATH)
-#ifdef UNICODE
-#define SHARD_PATH  SHARD_PATHW
-#else
-#define SHARD_PATH  SHARD_PATHA
-#endif
-#endif
-
-#endif
-
 GHOST_SystemPathsWin32::GHOST_SystemPathsWin32()
 {
 }
diff --git a/intern/ghost/intern/GHOST_SystemWin32.cpp b/intern/ghost/intern/GHOST_SystemWin32.cpp
index 240d7ccd2fe..ca7118de7b0 100644
--- a/intern/ghost/intern/GHOST_SystemWin32.cpp
+++ b/intern/ghost/intern/GHOST_SystemWin32.cpp
@@ -890,25 +890,15 @@ bool GHOST_SystemWin32::processNDOF(RAWINPUT const &raw)
 	// send motion. Mark as 'sent' so motion will always get dispatched.
 	eventSent = true;
 
-#if defined(_MSC_VER) || defined(FREE_WINDOWS64)
+#if defined(_MSC_VER)
 	// using Microsoft compiler & header files
 	// they invented the RawInput API, so this version is (probably) correct.
-	// MinGW64 also works fine with this
 	BYTE const *data = raw.data.hid.bRawData;
 	// struct RAWHID {
 	// DWORD dwSizeHid;
 	// DWORD dwCount;
 	// BYTE  bRawData[1];
 	// };
-#else
-	// MinGW's definition (below) doesn't agree, so we need a slight
-	// workaround until it's fixed
-	BYTE const *data = &raw.data.hid.bRawData;
-	// struct RAWHID {
-	// DWORD dwSizeHid;
-	// DWORD dwCount;
-	// BYTE bRawData; // <== isn't this s'posed to be a BYTE*?
-	// };
 #endif
 
 	BYTE packetType = data[0];
diff --git a/intern/ghost/intern/GHOST_SystemWin32.h b/intern/ghost/intern/GHOST_SystemWin32.h
index d534a300b35..099d14e68ae 100644
--- a/intern/ghost/intern/GHOST_SystemWin32.h
+++ b/intern/ghost/intern/GHOST_SystemWin32.h
@@ -37,10 +37,10 @@
 #error WIN32 only!
 #endif // WIN32
 
-#ifndef __MINGW64__
-#  undef _WIN32_WINNT
-#  define _WIN32_WINNT 0x501 // require Windows XP or newer
-#endif
+/* require Windows XP or newer */
+#undef _WIN32_WINNT
+#define _WIN32_WINNT 0x501
+
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <ole2.h> // for drag-n-drop
diff --git a/intern/ghost/intern/GHOST_TaskbarWin32.h b/intern/ghost/intern/GHOST_TaskbarWin32.h
index 6fcff297237..0ef71754717 100644
--- a/intern/ghost/intern/GHOST_TaskbarWin32.h
+++ b/intern/ghost/intern/GHOST_TaskbarWin32.h
@@ -8,10 +8,10 @@
 #error WIN32 only!
 #endif // WIN32
 
-#ifndef __MINGW64__
-#  undef _WIN32_WINNT
-#  define _WIN32_WINNT 0x501 // require Windows XP or newer
-#endif
+/* require Windows XP or newer */
+#undef _WIN32_WINNT
+#define _WIN32_WINNT 0x501
+
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <shlobj.h>
diff --git a/intern/guardedalloc/intern/mallocn_intern.h b/intern/guardedalloc/intern/mallocn_intern.h
index 3f7e462c1c7..a292a2eb5a0 100644
--- a/intern/guardedalloc/intern/mallocn_intern.h
+++ b/intern/guardedalloc/intern/mallocn_intern.h
@@ -89,14 +89,6 @@
 
 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__)
 // Needed for memalign on Linux and _aligned_alloc on Windows.
-#  ifdef FREE_WINDOWS
-/* make sure _aligned_malloc is included */
-#    ifdef __MSVCRT_VERSION__
-#      undef __MSVCRT_VERSION__
-#    endif
-
-#    define __MSVCRT_VERSION__ 0x0700
-#  endif  // FREE_WINDOWS
 
 #  include <malloc.h>
 #else
diff --git a/intern/opencolorio/CMakeLists.txt b/intern/opencolorio/CMakeLists.txt
index 61a8d995f40..75e228933aa 100644
--- a/intern/opencolorio/CMakeLists.txt
+++ b/intern/opencolorio/CMakeLists.txt
@@ -59,7 +59,7 @@ if(WITH_OPENCOLORIO)
 		ocio_impl_glsl.cc
 	)
 
-	if(WIN32 AND NOT MINGW)
+	if(WIN32)
 		list(APPEND INC_SYS
 			${BOOST_INCLUDE_DIR}
 		)