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, 7 insertions, 22 deletions

diff --git a/source/blender/blenlib/BLI_winstuff.h b/source/blender/blenlib/BLI_winstuff.h
index b421b7dbb90..6fbbed01400 100644
--- a/source/blender/blenlib/BLI_winstuff.h
+++ b/source/blender/blenlib/BLI_winstuff.h
@@ -37,15 +37,6 @@
 #  error "This include is for Windows only!"
 #endif
 
-#ifdef FREE_WINDOWS
-#  ifdef WINVER
-#    undef WINVER
-#  endif
-
-/* Some stuff requires WINVER 0x500, but mingw's default is 0x400 */
-#  define WINVER 0x0501
-#endif
-
 #define WIN32_LEAN_AND_MEAN
 
 #ifndef WIN32_SKIP_HKEY_PROTECTION
@@ -94,7 +85,7 @@ extern "C" {
 #  define snprintf _snprintf
 #endif
 
-#if defined(_MSC_VER) || (defined(FREE_WINDOWS) && !defined(FREE_WINDOWS64))
+#if defined(_MSC_VER)
 #  define	R_OK	4
 #  define	W_OK	2
 // not accepted by access() on windows
@@ -102,28 +93,22 @@ extern "C" {
 #  define	F_OK	0
 #endif
 
-#ifndef FREE_WINDOWS
 typedef unsigned int mode_t;
-#endif
 
 /* use functions that take a 64 bit offset for files larger than 4GB */
-#ifndef FREE_WINDOWS
-#  include <stdio.h>
-#  define fseek(stream, offset, origin) _fseeki64(stream, offset, origin)
-#  define ftell(stream) _ftelli64(stream)
-#  define lseek(fd, offset, origin) _lseeki64(fd, offset, origin)
-#  define tell(fd) _telli64(fd)
-#endif
+#include <stdio.h>
+#define fseek(stream, offset, origin) _fseeki64(stream, offset, origin)
+#define ftell(stream) _ftelli64(stream)
+#define lseek(fd, offset, origin) _lseeki64(fd, offset, origin)
+#define tell(fd) _telli64(fd)
+
 
-/* mingw using _SSIZE_T_ to declare ssize_t type */
 #ifndef _SSIZE_T_
 #  define _SSIZE_T_
 /* python uses HAVE_SSIZE_T */
 #  ifndef HAVE_SSIZE_T
 #    define HAVE_SSIZE_T 1
-#    ifndef FREE_WINDOWS64
 typedef long ssize_t;
-#    endif
 #  endif
 #endif