handle errno defns for mingw and use correct executable name

.gitignore

@@ -58,4 +58,8 @@ TAGS
 #################
 *.orig
 
+# Emacs backup files
+####################
+*~
+
 *.DS_Store

mpy-cross/Makefile

@@ -14,7 +14,13 @@ endif
 include ../py/mkenv.mk
 
 # define main target
+
+ifeq ($(OS),Windows_NT)
+# Detect a MINGW32 build, and change the name of the final executable.
+PROG = mpy-cross.exe
+else
 PROG = mpy-cross
+endif
 
 # qstr definitions (must come before including py.mk)
 QSTR_DEFS = qstrdefsport.h

mpy-cross/mpconfigport.h

@@ -85,6 +85,50 @@
 #define MICROPY_PY_IO               (0)
 #define MICROPY_PY_SYS              (0)
 
+// MINGW only handles these errno names.
+#ifdef __MINGW32__
+#define MICROPY_PY_UERRNO_LIST \
+  X(EPERM) \
+  X(ENOENT) \
+  X(ESRCH) \
+  X(EINTR) \
+  X(EIO) \
+  X(ENXIO) \
+  X(E2BIG) \
+  X(ENOEXEC) \
+  X(EBADF) \
+  X(ECHILD) \
+  X(EAGAIN) \
+  X(ENOMEM) \
+  X(EACCES) \
+  X(EFAULT) \
+  X(EBUSY) \
+  X(EEXIST) \
+  X(EXDEV) \
+  X(ENODEV) \
+  X(ENOTDIR) \
+  X(EISDIR) \
+  X(EINVAL) \
+  X(ENFILE) \
+  X(EMFILE) \
+  X(ENOTTY) \
+  X(EFBIG) \
+  X(ENOSPC) \
+  X(ESPIPE) \
+  X(EROFS) \
+  X(EMLINK) \
+  X(EPIPE) \
+  X(EDOM) \
+  X(ERANGE) \
+  X(EDEADLOCK) \
+  X(EDEADLK) \
+  X(ENAMETOOLONG) \
+  X(ENOLCK) \
+  X(ENOSYS) \
+  X(ENOTEMPTY) \
+  X(EILSEQ)
+#endif
+  
 // type definitions for the specific machine
 
 #ifdef __LP64__