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Backport of commit 052aff95782fefe9c63566471063e8b20836bfb8
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Wed Jan 23 00:42:51 2013 +0000
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Make bits/wchar.h correct for all architectures (bug 15036).
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2013-01-23 Joseph Myers <joseph@codesourcery.com>
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[BZ #15036]
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* bits/wchar.h (__WCHAR_MAX): Define based on __WCHAR_MAX__, or
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based on [L'\0' - 1 > 0] if [!__WCHAR_MAX__].
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(__WCHAR_MIN): Likewise, using __WCHAR_MIN__.
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* sysdeps/unix/sysv/linux/x86/bits/wchar.h: Remove.
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diff -ruNp a/bits/wchar.h b/bits/wchar.h
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--- a/bits/wchar.h 2012-12-24 22:02:13.000000000 -0500
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+++ b/bits/wchar.h 2014-03-27 14:53:45.940914030 -0400
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@@ -19,7 +19,31 @@
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#ifndef _BITS_WCHAR_H
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#define _BITS_WCHAR_H 1
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-#define __WCHAR_MIN (-2147483647 - 1)
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-#define __WCHAR_MAX (2147483647)
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+/* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__
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+ are not defined, give the right value and type as long as both int
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+ and wchar_t are 32-bit types. Adding L'\0' to a constant value
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+ ensures that the type is correct; it is necessary to use (L'\0' +
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+ 0) rather than just L'\0' so that the type in C++ is the promoted
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+ version of wchar_t rather than the distinct wchar_t type itself.
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+ Because wchar_t in preprocessor #if expressions is treated as
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+ intmax_t or uintmax_t, the expression (L'\0' - 1) would have the
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+ wrong value for WCHAR_MAX in such expressions and so cannot be used
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+ to define __WCHAR_MAX in the unsigned case. */
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+
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+#ifdef __WCHAR_MAX__
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+# define __WCHAR_MAX __WCHAR_MAX__
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+#elif L'\0' - 1 > 0
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+# define __WCHAR_MAX (0xffffffffu + L'\0')
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+#else
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+# define __WCHAR_MAX (0x7fffffff + L'\0')
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+#endif
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+
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+#ifdef __WCHAR_MIN__
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+# define __WCHAR_MIN __WCHAR_MIN__
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+#elif L'\0' - 1 > 0
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+# define __WCHAR_MIN (L'\0' + 0)
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+#else
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+# define __WCHAR_MIN (-__WCHAR_MAX - 1)
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+#endif
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#endif /* bits/wchar.h */
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