Strange "make buildworld" error

Reply: George Mitchell : "Re: Strange "make buildworld" error"
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From: George Mitchell <george+freebsd_at_m5p.com>
Date: Thu, 06 Oct 2022 23:22:56 UTC

On a FreeBSD 12.3-RELEASE-p6, I have updated /usr/src to 13.1-RELEASE.
Running "make buildworld" resulted in this error while building shared
library libclang_rt.asan-x86_64.so:

ld: error: duplicate symbol: 
__asan::FlushUnneededASanShadowMemory(unsigned long, unsigned long)
 >>> defined at asan_linux.cpp:118 
(/usr/src/contrib/llvm-project/compiler-rt/lib/asan/asan_linux.cpp:118)
 >>> 
asan/asan_linux.pico:(__asan::FlushUnneededASanShadowMemory(unsigned 
long, unsigned long))
 >>> defined at asan_poisoning.cpp:65 
(/usr/src/contrib/llvm-project/compiler-rt/lib/asan/asan_poisoning.cpp:65)
 >>>            asan/asan_poisoning.pico:(.text+0x530)

However, line 65 of asan_poisoning.cpp neither defines nor even
references FlushUnneededASanShadowMemory.  Instead, it defines
AsanPoisonOrUnpoisonIntraObjectRedzone.

A complete typescript is here:
https://www.m5p.com/~george/FlushUnneededASanShadowMemory.xz
I am mystified.                                         -- George