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-rw-r--r--include/mrbconf.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/mrbconf.h b/include/mrbconf.h
index d8dca7d61..4e256384d 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -71,6 +71,10 @@
# define str_to_mrb_float(buf) strtod(buf, NULL)
#endif
+#if defined(MRB_INT16) && defined(MRB_INT64)
+# error You can't define MRB_INT16 and MRB_INT64 at the same time.
+#endif
+
#if defined(MRB_INT64)
# ifdef MRB_NAN_BOXING
# error Cannot use NaN boxing when mrb_int is 64bit