Fix builds for old mingw in mruby-socket; ref #4914

include/mruby/common.h

@@ -74,6 +74,16 @@ MRB_BEGIN_DECL
 #endif
 #endif
 
+/** Declare mingw versions */
+#if defined(__MINGW32__) || defined(__MINGW64__)
+# include <_mingw.h>
+# if defined(__MINGW64_VERSION_MAJOR)
+#  define MRB_MINGW64_VERSION  (__MINGW64_VERSION_MAJOR * 1000 + __MINGW64_VERSION_MINOR)
+# elif defined(__MINGW32_MAJOR_VERSION)
+#  define MRB_MINGW32_VERSION  (__MINGW32_MAJOR_VERSION * 1000 + __MINGW32_MINOR_VERSION)
+# endif
+#endif
+
 MRB_END_DECL
 
 #endif  /* MRUBY_COMMON_H */

mrbgems/mruby-io/test/mruby_io_test.c

+#include <mruby/common.h>
 #include <sys/types.h>
 #include <errno.h>
 
@@ -18,12 +19,6 @@ typedef int mode_t;
 #define open _open
 #define close _close
 
-#if defined(__MINGW64_VERSION_MAJOR)
-# define MRB_MINGW64_VERSION  (__MINGW64_VERSION_MAJOR * 1000 + __MINGW64_VERSION_MINOR)
-#elif defined(__MINGW32_MAJOR_VERSION)
-# define MRB_MINGW32_VERSION  (__MINGW32_MAJOR_VERSION * 1000 + __MINGW32_MINOR_VERSION)
-#endif
-
 #if defined(_MSC_VER) || \
     (defined(MRB_MINGW32_VERSION) && MRB_MINGW32_VERSION < 3021) || \
     (defined(MRB_MINGW64_VERSION) && MRB_MINGW64_VERSION < 4000)

mrbgems/mruby-socket/test/sockettest.c

@@ -8,7 +8,9 @@
 
 #include <io.h>
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || \
+    (defined(MRB_MINGW32_VERSION) && MRB_MINGW32_VERSION < 3021) || \
+    (defined(MRB_MINGW64_VERSION) && MRB_MINGW64_VERSION < 4000)
 
 #include <fcntl.h>
 #include <sys/stat.h>