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53 lines
1.9 KiB
53 lines
1.9 KiB
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 glibc-2.17-c758a686/bits/wchar.h glibc-2.17-c758a686/bits/wchar.h |
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--- glibc-2.17-c758a686/bits/wchar.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ glibc-2.17-c758a686/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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