Note that GCC does not support the "Annex G" complex arithmetic even
though __GCC_IEC_559_COMPLEX is defined. Thus, we leave
__STDC_IEC_559_COMPLEX__ undefined for now.

Reference: http://www.openwall.com/lists/musl/2016/03/31/2

Signed-off-by: Masanori Ogino <masanori.ogino@gmail.com>
---
 include/stdc-predef.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 include/stdc-predef.h

diff --git a/include/stdc-predef.h b/include/stdc-predef.h
new file mode 100644
index 0000000..baa8a54
--- /dev/null
+++ b/include/stdc-predef.h
@@ -0,0 +1,11 @@
+#ifndef _STDC_PREDEF_H
+#define _STDC_PREDEF_H
+
+/* ISO/IEC 10646:2012, equivalent to Unicode 6.1 */
+#define __STDC_ISO_10646__ 201206L
+
+#if __GCC_IEC_559 > 0
+#define __STDC_IEC_559__ 1
+#endif
+
+#endif
--
2.7.3