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-rw-r--r--include/stdc-predef.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/stdc-predef.h b/include/stdc-predef.h
index f18b626cc3..a2e148cd2f 100644
--- a/include/stdc-predef.h
+++ b/include/stdc-predef.h
@@ -49,10 +49,12 @@
 # define __STDC_IEC_559_COMPLEX__	1
 #endif
 
-/* wchar_t uses Unicode 8.0.0.  Version 8.0 of the Unicode Standard is
-   synchronized with ISO/IEC 10646:2014, plus Amendment 1 (published
-   2015-05-15).  */
-#define __STDC_ISO_10646__		201505L
+/* wchar_t uses Unicode 9.0.0.  Version 9.0 of the Unicode Standard is
+   synchronized with ISO/IEC 10646:2014, fourth edition, plus
+   Amd. 1  and Amd. 2 and 273 characters from forthcoming  10646, fifth edition.
+   (Amd. 2 was published 2016-05-01,
+   see https://www.iso.org/obp/ui/#iso:std:iso-iec:10646:ed-4:v1:amd:2:v1:en) */
+#define __STDC_ISO_10646__		201605L
 
 /* We do not support C11 <threads.h>.  */
 #define __STDC_NO_THREADS__		1