.s: Assembler messages:
+a.s:1: Error: 0x80000000 out of range of signed 32bit displacement
+% clang -c a.s
+```
+
+The integrated assembler after #75747 will diagnose the invalid
+displacement as well.
+```
+% clang -c a.s
+a.s:1:19: error: displacement 2147483648 is not within [-2147483648, 2147483647]
+movsbl 0x80000000(%r10),%r10d
+                  ^
+```
+
+If ASAN_SHADOW_OFFSET_CONST cannot be encoded as a displacement, switch
+to `movabsq+movsbl`.
+---
+ compiler-rt/lib/asan/asan_rtl_x86_64.S | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git compiler-rt/lib/asan/asan_rtl_x86_64.S compiler-rt/lib/asan/asan_rtl_x86_64.S
+index 0b7363018f425f..e44587ac4331c7 100644
+--- compiler-rt/lib/asan/asan_rtl_x86_64.S
++++ compiler-rt/lib/asan/asan_rtl_x86_64.S
+@@ -27,7 +27,12 @@ FNAME(reg, op, s, i): ;\
+ #define ASAN_MEMORY_ACCESS_INITIAL_CHECK_ADD(reg, op, s) \
+         mov    %##reg,%r10 ;\
+         shr    $0x3,%r10 ;\
++        .if ASAN_SHADOW_OFFSET_CONST < 0x80000000   ;\
+         movsbl ASAN_SHADOW_OFFSET_CONST(%r10),%r10d ;\
++        .else                                       ;\
++        movabsq $ASAN_SHADOW_OFFSET_CONST,%r11      ;\
++        movsbl (%r10,%r11),%r10d                    ;\
++        .endif                                      ;\
+         test   %r10d,%r10d ;\
+         jne    CLABEL(reg, op, s, add) ;\
+ RLABEL(reg, op, s, add): ;\
diff --git a/devel/llvm17/files/patch-backport-llvmorg-18-init-15680-g966d564e43e6 b/devel/llvm17/files/patch-backport-llvmorg-18-init-15680-g966d564e43e6
new file mode 100644
index 000000000000..424e5f9eeea3
--- /dev/null
+++ b/devel/llvm17/files/patch-backport-llvmorg-18-init-15680-g966d564e43e6
@@ -0,0 +1,32 @@
+From 966d564e43e650b9c34f9c67829d3947f52add91 Mon Sep 17 00:00:00 2001
+From: Dan McGregor <dan.mcgregor@usask.ca>
+Date: Sun, 24 Dec 2023 22:37:35 -0600
+Subject: [PATCH] asan_static x86-64: Support 64-bit ASAN_SHADOW_OFFSET_CONST
+ redux (#76185)
+
+Similar to b9935bb02a50, but also apply a similar change to
+ACCESS_CHECK_ADD.
+
+If ASAN_SHADOW_OFFSET_CONST cannot be encoded as a displacement, switch
+to `movabsq` and the register offset variant of cmp.
+---
+ compiler-rt/lib/asan/asan_rtl_x86_64.S | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git compiler-rt/lib/asan/asan_rtl_x86_64.S compiler-rt/lib/asan/asan_rtl_x86_64.S
+index e44587ac4331c7..9c5289856d8ae6 100644
+--- compiler-rt/lib/asan/asan_rtl_x86_64.S
++++ compiler-rt/lib/asan/asan_rtl_x86_64.S
+@@ -89,7 +89,12 @@ ENDF
+ #define ASAN_MEMORY_ACCESS_CHECK_ADD(reg, op, s, c) \
+         mov    %##reg,%r10 ;\
+         shr    $0x3,%r10 ;\
++        .if ASAN_SHADOW_OFFSET_CONST < 0x80000000  ;\
+         ##c    $0x0,ASAN_SHADOW_OFFSET_CONST(%r10) ;\
++        .else                                      ;\
++        movabsq $ASAN_SHADOW_OFFSET_CONST,%r11     ;\
++        ##c    $0x0,(%r10,%r11)                    ;\
++        .endif                                     ;\
+         jne    FLABEL(reg, op, s, add) ;\
+         retq  ;\
+ 
diff --git a/devel/llvm17/files/patch-backport-llvmorg-18-init-1760-g68744ffbdd7d b/devel/llvm17/files/patch-backport-llvmorg-18-init-1760-g68744ffbdd7d
new file mode 100644
index 000000000000..58ff453d8a06
--- /dev/null
+++ b/devel/llvm17/files/patch-backport-llvmorg-18-init-1760-g68744ffbdd7d
@@ -0,0 +1,31 @@
+From 68744ffbdd7daac41da274eef9ac0d191e11c16d Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
+Date: Thu, 10 Aug 2023 11:09:36 +0300
+Subject: [PATCH] [lldb] Fix building with latest libc++
+
+Since https://reviews.llvm.org/D157058 in libc++,
+the base template for char_traits has been removed - it is only
+provided for char, wchar_t, char8_t, char16_t and char32_t.
+(Thus, to use basic_string with a type other than those, we'd need
+to supply suitable traits ourselves.)
+
+For this particular use, a vector works just as well as basic_string.
+
+Differential Revision: https://reviews.llvm.org/D157589
+---
+ .../Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp     | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+index 4efc454967a12..f9d95fc5d2a66 100644
+--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
++++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+@@ -631,7 +631,7 @@ static void WriteRegisterValueInHexFixedWidth(
+   } else {
+     // Zero-out any unreadable values.
+     if (reg_info.byte_size > 0) {
+-      std::basic_string<uint8_t> zeros(reg_info.byte_size, '\0');
++      std::vector<uint8_t> zeros(reg_info.byte_size, '\0');
+       AppendHexValue(response, zeros.data(), zeros.size(), false);
+     }
+   }