nptl: Move pthread_attr_setinheritsched implementation into libc.

[thirdparty/glibc.git] / bits / wchar.h

diff --git a/bits/wchar.h b/bits/wchar.h
index a3ff5319e6ac16bc3c417a89e055a7c44c9a73c6..2fd88c60eb26f20a4bfef0d41f62754e1b8f0c46 100644 (file)
--- a/bits/wchar.h
+++ b/bits/wchar.h
@@ -1,5 +1,5 @@
 /* wchar_t type related definitions.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright (C) 2000-2019 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
@@ -14,12 +14,36 @@
 
    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/>.  */
+   <https://www.gnu.org/licenses/>.  */
 
 #ifndef _BITS_WCHAR_H
 #define _BITS_WCHAR_H  1
 
-#define __WCHAR_MIN    (-2147483647 - 1)
-#define __WCHAR_MAX    (2147483647)
+/* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__
+   are not defined, give the right value and type as long as both int
+   and wchar_t are 32-bit types.  Adding L'\0' to a constant value
+   ensures that the type is correct; it is necessary to use (L'\0' +
+   0) rather than just L'\0' so that the type in C++ is the promoted
+   version of wchar_t rather than the distinct wchar_t type itself.
+   Because wchar_t in preprocessor #if expressions is treated as
+   intmax_t or uintmax_t, the expression (L'\0' - 1) would have the
+   wrong value for WCHAR_MAX in such expressions and so cannot be used
+   to define __WCHAR_MAX in the unsigned case.  */
+
+#ifdef __WCHAR_MAX__
+# define __WCHAR_MAX   __WCHAR_MAX__
+#elif L'\0' - 1 > 0
+# define __WCHAR_MAX   (0xffffffffu + L'\0')
+#else
+# define __WCHAR_MAX   (0x7fffffff + L'\0')
+#endif
+
+#ifdef __WCHAR_MIN__
+# define __WCHAR_MIN   __WCHAR_MIN__
+#elif L'\0' - 1 > 0
+# define __WCHAR_MIN   (L'\0' + 0)
+#else
+# define __WCHAR_MIN   (-__WCHAR_MAX - 1)
+#endif
 
 #endif /* bits/wchar.h */