Index: otp/erts/emulator/sys/win32/sys_float.c
===================================================================
--- otp.orig/erts/emulator/sys/win32/sys_float.c	2014-09-29 00:35:14.235409800 +0300
+++ otp/erts/emulator/sys/win32/sys_float.c	2014-09-29 21:05:43.719389200 +0300
@@ -30,10 +30,26 @@
 
 static void fpe_exception(int sig);
 
+#if defined(__MINGW_GCC_VERSION)
+#ifdef USE_MATHERR
+int erts_matherr(struct _exception *exc);
+void
+erts_sys_init_float(void)
+{
+   __mingw_setusermatherr(erts_matherr);
+}
+#else
 void
 erts_sys_init_float(void)
 {
 }
+#endif
+#else
+void
+erts_sys_init_float(void)
+{
+}
+#endif
 void erts_thread_init_float(void)
 {
 }
@@ -120,7 +136,7 @@
 int
 sys_double_to_chars_ext(double fp, char *buffer, size_t buffer_size, size_t decimals)
 {
-    unsigned char *s = buffer;
+    char *s = buffer;
 
     if (erts_snprintf(buffer, buffer_size, "%.*e", decimals, fp) >= buffer_size)
         return -1;
@@ -135,8 +151,13 @@
 
 #ifdef USE_MATHERR
 
+#if defined(__MINGW_GCC_VERSION)
+int
+erts_matherr(struct _exception *exc)
+#else
 int
 matherr(struct _exception *exc)
+#endif
 {
     erl_fp_exception = 1;
     DEBUGF(("FP exception (matherr) (0x%x) (%d)\n", exc->type, erl_fp_exception));
Index: otp/erts/etc/win32/erl.c
===================================================================
--- otp.orig/erts/etc/win32/erl.c	2014-09-29 21:05:23.759414700 +0300
+++ otp/erts/etc/win32/erl.c	2014-09-29 21:05:43.752722500 +0300
@@ -248,9 +248,8 @@
     free(dir);
     if (p == NULL) {
 	error("Cannot find erlexec.exe");
-    } else {
-	return p;
     }
+    return p;
 }
 
 static void get_parameters(void)
Index: otp/erts/etc/win32/win_erlexec.c
===================================================================
--- otp.orig/erts/etc/win32/win_erlexec.c	2014-09-29 00:35:14.235409800 +0300
+++ otp/erts/etc/win32/win_erlexec.c	2014-09-29 21:05:43.766055800 +0300
@@ -131,6 +131,7 @@
     }
 }
 
+void
 free_env_val(char *value)
 {
     if (value)
Index: otp/lib/odbc/c_src/Makefile.in
===================================================================
--- otp.orig/lib/odbc/c_src/Makefile.in	2014-09-29 21:05:42.069391300 +0300
+++ otp/lib/odbc/c_src/Makefile.in	2014-09-29 21:05:43.792722400 +0300
@@ -22,6 +22,7 @@
 include $(ERL_TOP)/make/$(TARGET)/otp.mk
 
 USING_MINGW=@MIXED_CYGWIN_MINGW@
+BITS64=@BITS64@
 
 ifeq ($(TYPE),debug)
 TYPEMARKER = .debug
@@ -59,7 +60,9 @@
 ENTRY_OBJ=$(ERL_TOP)/erts/obj/$(TARGET)/port_entry.o
 PORT_ENTRY_POINT=erl_port_entry
 ifeq ($(USING_MINGW), yes)
+ifneq ($(BITS64), yes)
 ENTRY_LDFLAGS=-Xlinker --thumb-entry=$(PORT_ENTRY_POINT)
+endif
 else
 ENTRY_LDFLAGS=-entry:$(PORT_ENTRY_POINT)
 endif
Index: otp/lib/odbc/c_src/odbcserver.c
===================================================================
--- otp.orig/lib/odbc/c_src/odbcserver.c	2014-09-29 21:05:36.022732400 +0300
+++ otp/lib/odbc/c_src/odbcserver.c	2014-09-29 21:05:43.816055700 +0300
@@ -134,7 +134,7 @@
 /* ---------------- Main functions ---------------------------------------*/
 static void spawn_sup(const char *port);
 #ifdef WIN32
-DWORD WINAPI database_handler(const char *port);
+void WINAPI database_handler(const char *port);
 #else
 void database_handler(const char *port);
 #endif
Index: otp/lib/odbc/configure.in
===================================================================
--- otp.orig/lib/odbc/configure.in	2014-09-28 15:49:17.906250000 +0300
+++ otp/lib/odbc/configure.in	2014-09-29 21:05:43.856055700 +0300
@@ -248,4 +248,11 @@
 LDFLAGS="$LDFLAGS $sanitizers"
 ])
 
+BITS64=
+
+if test $ac_cv_sizeof_void_p = 8; then
+  BITS64=yes
+fi
+AC_SUBST(BITS64)
+
 AC_OUTPUT(c_src/$host/Makefile:c_src/Makefile.in)
Index: otp/lib/wx/c_src/Makefile.in
===================================================================
--- otp.orig/lib/wx/c_src/Makefile.in	2014-09-29 21:05:42.239391100 +0300
+++ otp/lib/wx/c_src/Makefile.in	2014-09-29 21:05:43.922722200 +0300
@@ -111,7 +111,7 @@
 
 CC_O		= $(V_CC) -c $(CFLAGS) $(WX_CFLAGS) $(COMMON_CFLAGS)
 OBJC_CC_O	= $(OBJC_CC) -c $(CFLAGS) $(OBJC_CFLAGS) $(WX_CFLAGS) $(COMMON_CFLAGS)
-CXX_O		= $(V_CXX) -c $(CXX_FLAGS) $(WX_CXX_FLAGS)  $(COMMON_CFLAGS)
+CXX_O		= $(V_CXX) -c -fpermissive $(CXX_FLAGS) $(WX_CXX_FLAGS)  $(COMMON_CFLAGS)
 
 ifeq ($(SYS_TYPE),win32)
 GL_LIBS = -lopengl32 -lglu32