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diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -52,6 +52,11 @@
# xargs -n1 | sort | uniq -d;
# done
+# 20220210: unwind.h moved to /usr/include
+OLD_FILES+=usr/include/c++/v1/unwind-arm.h
+OLD_FILES+=usr/include/c++/v1/unwind-itanium.h
+OLD_FILES+=usr/include/c++/v1/unwind.h
+
# 20220128: mips pmc events removed
OLD_FILES+=usr/share/man/man3/pmc.mips24k.3
OLD_FILES+=usr/share/man/man3/pmc.octeon.3
diff --git a/include/unwind.h b/include/unwind.h
deleted file mode 100644
--- a/include/unwind.h
+++ /dev/null
@@ -1,160 +0,0 @@
-/* $FreeBSD$ */
-
-/*-
- libunwind - a platform-independent unwind library
-
- SPDX-License-Identifier: ISC
-
- Copyright (C) 2003 Hewlett-Packard Co
- Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
-
-This file is part of libunwind.
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
-
-#ifndef _UNWIND_H
-#define _UNWIND_H
-
-#include <sys/_types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Minimal interface as per C++ ABI draft standard:
-
- http://www.codesourcery.com/cxx-abi/abi-eh.html */
-
-typedef enum
- {
- _URC_NO_REASON = 0,
- _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
- _URC_FATAL_PHASE2_ERROR = 2,
- _URC_FATAL_PHASE1_ERROR = 3,
- _URC_NORMAL_STOP = 4,
- _URC_END_OF_STACK = 5,
- _URC_HANDLER_FOUND = 6,
- _URC_INSTALL_CONTEXT = 7,
- _URC_CONTINUE_UNWIND = 8
- }
-_Unwind_Reason_Code;
-
-typedef int _Unwind_Action;
-
-#define _UA_SEARCH_PHASE 1
-#define _UA_CLEANUP_PHASE 2
-#define _UA_HANDLER_FRAME 4
-#define _UA_FORCE_UNWIND 8
-
-struct _Unwind_Context; /* opaque data-structure */
-struct _Unwind_Exception; /* forward-declaration */
-
-typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
- struct _Unwind_Exception *);
-
-typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn) (int, _Unwind_Action,
- __uint64_t,
- struct _Unwind_Exception *,
- struct _Unwind_Context *,
- void *);
-
-/* The C++ ABI requires exception_class, private_1, and private_2 to
- be of type uint64 and the entire structure to be
- double-word-aligned, but that seems a bit overly IA-64-specific.
- Using "unsigned long" instead should give us the desired effect on
- IA-64, while being more general. */
-struct _Unwind_Exception
- {
- __uint64_t exception_class;
- _Unwind_Exception_Cleanup_Fn exception_cleanup;
- unsigned long private_1;
- unsigned long private_2;
- };
-
-extern _Unwind_Reason_Code _Unwind_RaiseException (struct _Unwind_Exception *);
-extern _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *,
- _Unwind_Stop_Fn, void *);
-extern void _Unwind_Resume (struct _Unwind_Exception *);
-extern void _Unwind_DeleteException (struct _Unwind_Exception *);
-extern unsigned long _Unwind_GetGR (struct _Unwind_Context *, int);
-extern void _Unwind_SetGR (struct _Unwind_Context *, int, unsigned long);
-extern unsigned long _Unwind_GetIP (struct _Unwind_Context *);
-extern unsigned long _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
-extern void _Unwind_SetIP (struct _Unwind_Context *, unsigned long);
-extern unsigned long _Unwind_GetLanguageSpecificData (struct _Unwind_Context*);
-extern unsigned long _Unwind_GetRegionStart (struct _Unwind_Context *);
-
-#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-
-/* Callback for _Unwind_Backtrace(). The backtrace stops immediately
- if the callback returns any value other than _URC_NO_REASON. */
-typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (struct _Unwind_Context *,
- void *);
-
-/* See http://gcc.gnu.org/ml/gcc-patches/2001-09/msg00082.html for why
- _UA_END_OF_STACK exists. */
-# define _UA_END_OF_STACK 16
-
-/* If the unwind was initiated due to a forced unwind, resume that
- operation, else re-raise the exception. This is used by
- __cxa_rethrow(). */
-extern _Unwind_Reason_Code
- _Unwind_Resume_or_Rethrow (struct _Unwind_Exception *);
-
-/* See http://gcc.gnu.org/ml/gcc-patches/2003-09/msg00154.html for why
- _Unwind_GetBSP() exists. */
-extern unsigned long _Unwind_GetBSP (struct _Unwind_Context *);
-
-/* Return the "canonical frame address" for the given context.
- This is used by NPTL... */
-extern uintptr_t _Unwind_GetCFA (struct _Unwind_Context *);
-
-/* Return the base-address for data references. */
-extern unsigned long _Unwind_GetDataRelBase (struct _Unwind_Context *);
-
-/* Return the base-address for text references. */
-extern unsigned long _Unwind_GetTextRelBase (struct _Unwind_Context *);
-
-/* Call _Unwind_Trace_Fn once for each stack-frame, without doing any
- cleanup. The first frame for which the callback is invoked is the
- one for the caller of _Unwind_Backtrace(). _Unwind_Backtrace()
- returns _URC_END_OF_STACK when the backtrace stopped due to
- reaching the end of the call-chain or _URC_FATAL_PHASE1_ERROR if it
- stops for any other reason. */
-extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
-
-/* Find the start-address of the procedure containing the specified IP
- or NULL if it cannot be found (e.g., because the function has no
- unwind info). Note: there is not necessarily a one-to-one
- correspondence between source-level functions and procedures: some
- functions don't have unwind-info and others are split into multiple
- procedures. */
-extern void *_Unwind_FindEnclosingFunction (void *);
-
-/* See also Linux Standard Base Spec:
- http://www.linuxbase.org/spec/refspecs/LSB_1.3.0/gLSB/gLSB/libgcc-s.html */
-
-#endif /* _GNU_SOURCE || _BSD_SOURCE */
-
-#ifdef __cplusplus
-};
-#endif
-
-#endif /* _UNWIND_H */
diff --git a/lib/libc++/Makefile b/lib/libc++/Makefile
--- a/lib/libc++/Makefile
+++ b/lib/libc++/Makefile
@@ -239,9 +239,6 @@
STD+= ${.CURDIR}/__config_site
RT_HEADERS+= cxxabi.h
-RT_HEADERS+= unwind-arm.h
-RT_HEADERS+= unwind-itanium.h
-RT_HEADERS+= unwind.h
.for hdr in ${RT_HEADERS}
STD+= ${_LIBCXXRTDIR}/${hdr}
.endfor
diff --git a/lib/libgcc_eh/Makefile b/lib/libgcc_eh/Makefile
--- a/lib/libgcc_eh/Makefile
+++ b/lib/libgcc_eh/Makefile
@@ -11,6 +11,10 @@
SRCS_EXC+= int_util.c
.include "Makefile.inc"
+INCS+= ${UNWINDINCDIR}/__libunwind_config.h
+INCS+= ${UNWINDINCDIR}/libunwind.h
+INCS+= ${UNWINDINCDIR}/unwind.h
+
.if ${.MAKE.LEVEL} > 0
# avoid circular dependencies
GENDIRDEPS_FILTER+= Nlib/msun
diff --git a/lib/libgcc_eh/Makefile.inc b/lib/libgcc_eh/Makefile.inc
--- a/lib/libgcc_eh/Makefile.inc
+++ b/lib/libgcc_eh/Makefile.inc
@@ -34,7 +34,6 @@
.endfor
CFLAGS+= -I${UNWINDINCDIR}
-CFLAGS+= -I${.CURDIR}
CFLAGS+= -D_LIBUNWIND_IS_NATIVE_ONLY
CFLAGS+= -D_LIBUNWIND_USE_FRAME_HEADER_CACHE
CXXFLAGS+= -fno-rtti
diff --git a/lib/libthr/Makefile b/lib/libthr/Makefile
--- a/lib/libthr/Makefile
+++ b/lib/libthr/Makefile
@@ -19,7 +19,6 @@
CFLAGS+=-I${SRCTOP}/lib/libc/include
CFLAGS+=-I${SRCTOP}/lib/libc/${MACHINE_CPUARCH}
CFLAGS+=-I${.CURDIR}/thread
-CFLAGS+=-I${SRCTOP}/include
CFLAGS+=-I${.CURDIR}/arch/${MACHINE_CPUARCH}/include
CFLAGS+=-I${.CURDIR}/sys
CFLAGS+=-I${SRCTOP}/libexec/rtld-elf
diff --git a/tools/build/mk/OptionalObsoleteFiles.inc b/tools/build/mk/OptionalObsoleteFiles.inc
--- a/tools/build/mk/OptionalObsoleteFiles.inc
+++ b/tools/build/mk/OptionalObsoleteFiles.inc
@@ -4027,9 +4027,6 @@
OLD_FILES+=usr/include/c++/v1/typeinfo
OLD_FILES+=usr/include/c++/v1/unordered_map
OLD_FILES+=usr/include/c++/v1/unordered_set
-OLD_FILES+=usr/include/c++/v1/unwind-arm.h
-OLD_FILES+=usr/include/c++/v1/unwind-itanium.h
-OLD_FILES+=usr/include/c++/v1/unwind.h
OLD_FILES+=usr/include/c++/v1/utility
OLD_FILES+=usr/include/c++/v1/valarray
OLD_FILES+=usr/include/c++/v1/variant

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