Sculpt-dev: Print error message to console

when wintab initilization fails.

intern/ghost/GHOST_Types.h

@@ -25,6 +25,18 @@
 
 #include <stdint.h>
 
+#ifndef ATTR_NO_OPT
+#ifdef __clang__
+#  define ATTR_NO_OPT __attribute__((optnone))
+#elif defined(_MSC_VER)
+#  define ATTR_NO_OPT __pragma(optimize("", off))
+#elif defined(__GNUC__)
+#  define ATTR_NO_OPT __attribute__((optimize("O0")))
+#else
+#  define ATTR_NO_OPT
+#endif
+#endif
+
 #ifdef WITH_CXX_GUARDEDALLOC
 #  include "MEM_guardedalloc.h"
 #endif

intern/ghost/intern/GHOST_Wintab.cpp

@@ -21,6 +21,7 @@
 #define _USE_MATH_DEFINES
 
 #include "GHOST_Wintab.h"
+#include <cstdio>
 
 GHOST_Wintab *GHOST_Wintab::loadWintab(HWND hwnd)
 {
@@ -87,6 +88,9 @@ GHOST_Wintab *GHOST_Wintab::loadWintab(HWND hwnd)
 
   LOGCONTEXT lc = {0};
   if (!info(WTI_DEFSYSCTX, 0, &lc)) {
+    fprintf(stderr, "Failed to load Wintab driver\n");
+    fflush(stderr);
+
     return nullptr;
   }
 
@@ -97,6 +101,9 @@ GHOST_Wintab *GHOST_Wintab::loadWintab(HWND hwnd)
   /* The Wintab spec says we must open the context disabled if we are using cursor masks. */
   auto hctx = unique_hctx(open(hwnd, &lc, FALSE), close);
   if (!hctx) {
+    fprintf(stderr, "Failed to open Wintab driver\n");
+    fflush(stderr);
+
     return nullptr;
   }