2 files changed, 28 insertions, 29 deletions
diff --git a/libc/sysdeps/linux/common/bits/wchar.h b/libc/sysdeps/linux/common/bits/wchar.h
index a3ff5319e..ce951d9b6 100644
--- a/libc/sysdeps/linux/common/bits/wchar.h
+++ b/libc/sysdeps/linux/common/bits/wchar.h
@@ -1,5 +1,5 @@
 /* wchar_t type related definitions.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright (C) 2000-2023 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 */
diff --git a/libc/sysdeps/linux/i386/bits/wchar.h b/libc/sysdeps/linux/i386/bits/wchar.h
deleted file mode 100644
index b94fc7a3f..000000000
--- a/libc/sysdeps/linux/i386/bits/wchar.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* wchar_t type related definitions.
-   Copyright (C) 2000 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 _BITS_WCHAR_H
-#define _BITS_WCHAR_H	1
-
-#define __WCHAR_MIN	(-2147483647l - 1l)
-#define __WCHAR_MAX	(2147483647l)
-
-#endif	/* bits/wchar.h */