clang-12 @12.0.1: ld: 32-bit pointer in 64-bit arch

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-15_x86_64-builder/builds/50927/steps/install-port/logs/stdio

ld: warning: fixed-size symbol '_setjmp$non_lazy_ptr' is located within another atom, entire atom content will be used instead
ld: warning: fixed-size symbol '__setjmp$non_lazy_ptr' is located within another atom, entire atom content will be used instead
ld: warning: fixed-size symbol '_sigsetjmp$non_lazy_ptr' is located within another atom, entire atom content will be used instead
ld: 32-bit pointer in 64-bit arch: r_address=0x10, r_type=0, r_extern=1, r_pcrel=0, r_length=2 in 'CMakeFiles/clang_rt.tsan_osx_dynamic.dir/rtl/tsan_rtl_aarch64.S.o'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)