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+/* Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _STDC_PREDEF_H
+#define _STDC_PREDEF_H 1
+
+/* This header is separate from features.h so that the compiler can
+ include it implicitly at the start of every compilation. It must
+ not itself include <features.h> or any other header that includes
+ <features.h> because the implicit include comes before any feature
+ test macros that may be defined in a source file before it first
+ explicitly includes a system header. GCC knows the name of this
+ header in order to preinclude it. */
+
+/* glibc's intent is to support the IEC 559 math functionality, real
+ and complex. If the GCC (4.9 and later) predefined macros
+ specifying compiler intent are available, use them to determine
+ whether the overall intent is to support these features; otherwise,
+ presume an older compiler has intent to support these features and
+ define these macros by default. */
+
+#ifdef __GCC_IEC_559
+# if __GCC_IEC_559 > 0
+# define __STDC_IEC_559__ 1
+# endif
+#else
+# define __STDC_IEC_559__ 1
+#endif
+
+#ifdef __GCC_IEC_559_COMPLEX
+# if __GCC_IEC_559_COMPLEX > 0
+# define __STDC_IEC_559_COMPLEX__ 1
+# endif
+#else
+# define __STDC_IEC_559_COMPLEX__ 1
+#endif
+
+/* wchar_t uses Unicode 10.0.0. Version 10.0 of the Unicode Standard is
+ synchronized with ISO/IEC 10646:2017, fifth edition, plus
+ the following additions from Amendment 1 to the fifth edition:
+ - 56 emoji characters
+ - 285 hentaigana
+ - 3 additional Zanabazar Square characters */
+#define __STDC_ISO_10646__ 201706L
+
+/* We do not support C11 <threads.h>. */
+#define __STDC_NO_THREADS__ 1
+
+#endif