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

5 files changed, 14 insertions, 20 deletions

diff --git a/source/blender/imbuf/intern/IMB_anim.h b/source/blender/imbuf/intern/IMB_anim.h
index d89393b9903..6d7ad7985f9 100644
--- a/source/blender/imbuf/intern/IMB_anim.h
+++ b/source/blender/imbuf/intern/IMB_anim.h
@@ -40,10 +40,7 @@
 #  include <mmsystem.h>
 #  include <memory.h>
 #  include <commdlg.h>
-
-#  ifndef FREE_WINDOWS
-#    include <vfw.h>
-#  endif
+#  include <vfw.h>
 
 #  undef AVIIF_KEYFRAME // redefined in AVI_avi.h
 #  undef AVIIF_LIST // redefined in AVI_avi.h
@@ -130,7 +127,7 @@ struct anim {
 	/* avi */
 	struct _AviMovie *avi;
 
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 	/* windows avi */
 	int avistreams;
 	int firstvideo;
diff --git a/source/blender/imbuf/intern/anim_movie.c b/source/blender/imbuf/intern/anim_movie.c
index a40b257b75b..9806ff006d7 100644
--- a/source/blender/imbuf/intern/anim_movie.c
+++ b/source/blender/imbuf/intern/anim_movie.c
@@ -37,10 +37,7 @@
 #include <mmsystem.h>
 #include <memory.h>
 #include <commdlg.h>
-
-#ifndef FREE_WINDOWS
 #include <vfw.h>
-#endif
 
 #undef AVIIF_KEYFRAME /* redefined in AVI_avi.h */
 #undef AVIIF_LIST /* redefined in AVI_avi.h */
@@ -173,7 +170,7 @@ static void an_stringenc(char *string, const char *head, const char *tail, unsig
 #ifdef WITH_AVI
 static void free_anim_avi(struct anim *anim)
 {
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 	int i;
 #endif
 
@@ -184,7 +181,7 @@ static void free_anim_avi(struct anim *anim)
 	MEM_freeN(anim->avi);
 	anim->avi = NULL;
 
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 
 	if (anim->pgf) {
 		AVIStreamGetFrameClose(anim->pgf);
@@ -283,7 +280,7 @@ static int startavi(struct anim *anim)
 {
 
 	AviError avierror;
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 	HRESULT hr;
 	int i, firstvideo = -1;
 	int streamcount;
@@ -304,7 +301,7 @@ static int startavi(struct anim *anim)
 
 	avierror = AVI_open_movie(anim->name, anim->avi);
 
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 	if (avierror == AVI_ERROR_COMPRESSION) {
 		AVIFileInit();
 		hr = AVIFileOpen(&anim->pfile, anim->name, OF_READ, 0L);
@@ -401,7 +398,7 @@ static ImBuf *avi_fetchibuf(struct anim *anim, int position)
 		return NULL;
 	}
 
-#if defined(_WIN32) && !defined(FREE_WINDOWS)
+#if defined(_WIN32)
 	if (anim->avistreams) {
 		LPBITMAPINFOHEADER lpbi;
 
diff --git a/source/blender/imbuf/intern/dds/dds_api.cpp b/source/blender/imbuf/intern/dds/dds_api.cpp
index 12e03f55450..67a0b0ffd00 100644
--- a/source/blender/imbuf/intern/dds/dds_api.cpp
+++ b/source/blender/imbuf/intern/dds/dds_api.cpp
@@ -37,7 +37,7 @@ extern "C" {
 #include <stdio.h> // printf
 #include <fstream>
 
-#if defined (WIN32) && !defined(FREE_WINDOWS)
+#if defined (WIN32)
 #include "utfconv.h"
 #endif
 
@@ -62,7 +62,7 @@ int imb_save_dds(struct ImBuf *ibuf, const char *name, int /*flags*/)
 	/* open file for writing */
 	std::ofstream fildes;
 
-#if defined (WIN32) && !defined(FREE_WINDOWS)
+#if defined (WIN32)
 	wchar_t *wname = alloc_utf16_from_8(name, 0);
 	fildes.open(wname);
 	free(wname);
diff --git a/source/blender/imbuf/intern/oiio/openimageio_api.cpp b/source/blender/imbuf/intern/oiio/openimageio_api.cpp
index 224cf6347d2..b123d508f99 100644
--- a/source/blender/imbuf/intern/oiio/openimageio_api.cpp
+++ b/source/blender/imbuf/intern/oiio/openimageio_api.cpp
@@ -31,7 +31,7 @@
 
 #include <set>
 
-#if defined(WIN32) && !defined(FREE_WINDOWS)
+#if defined(WIN32)
 #include "utfconv.h"
 #endif
 
diff --git a/source/blender/imbuf/intern/openexr/openexr_api.cpp b/source/blender/imbuf/intern/openexr/openexr_api.cpp
index 29332a5c899..ec544e65355 100644
--- a/source/blender/imbuf/intern/openexr/openexr_api.cpp
+++ b/source/blender/imbuf/intern/openexr/openexr_api.cpp
@@ -69,7 +69,7 @@
 
 #include <openexr_api.h>
 
-#if defined (WIN32) && !defined(FREE_WINDOWS)
+#if defined (WIN32)
 #include "utfconv.h"
 #endif
 
@@ -77,7 +77,7 @@ extern "C"
 {
 
 // The following prevents a linking error in debug mode for MSVC using the libs in CVS
-#if defined(WITH_OPENEXR) && defined(_WIN32) && defined(DEBUG) && !defined(__MINGW32__) && _MSC_VER < 1900
+#if defined(WITH_OPENEXR) && defined(_WIN32) && defined(DEBUG) && _MSC_VER < 1900
 _CRTIMP void __cdecl _invalid_parameter_noinfo(void)
 {
 }
@@ -180,7 +180,7 @@ public:
 	: IStream(filename)
 	{
 		/* utf-8 file path support on windows */
-#if defined (WIN32) && !defined(FREE_WINDOWS)
+#if defined (WIN32)
 		wchar_t *wfilename = alloc_utf16_from_8(filename, 0);
 		ifs.open(wfilename, std::ios_base::binary);
 		free(wfilename);
@@ -243,7 +243,7 @@ public:
 	: OStream(filename)
 	{
 		/* utf-8 file path support on windows */
-#if defined (WIN32) && !defined(FREE_WINDOWS)
+#if defined (WIN32)
 		wchar_t *wfilename = alloc_utf16_from_8(filename, 0);
 		ofs.open(wfilename, std::ios_base::binary);
 		free(wfilename);