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-rw-r--r--include/mrbconf.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/mrbconf.h b/include/mrbconf.h
index ab5dd1a03..d47f46ae4 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -7,6 +7,20 @@
#ifndef MRUBYCONF_H
#define MRUBYCONF_H
+/* architecture selection: */
+/* specify -DMRB_32BIT or -DMRB_64BIT to override */
+#if !defined(MRB_32BIT) && !defined(MRB_64BIT)
+#if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) || defined(_M_AMD64) || defined(__aarch64__)
+#define MRB_64BIT
+#else
+#define MRB_32BIT
+#endif
+#endif
+
+#if defined(MRB_32BIT) && defined(MRB_64BIT)
+#error Cannot build for 32 and 64 bit architecture at the same time
+#endif
+
/* configuration options: */
/* add -DMRB_USE_FLOAT to use float instead of double for floating point numbers */
//#define MRB_USE_FLOAT