$ equery f llvm|grep linux|grep clang|grep st

There are some unexpected (temporary?) files that also got installed.

/usr/lib64/clang/8.0.0/lib/linux/sttna8jW/ubsan_handlers_cxx.cc.o
/usr/lib64/clang/8.0.0/lib/linux/sttna8jW/ubsan_type_hash.cc.o
/usr/lib64/clang/8.0.0/lib/linux/sttna8jW/ubsan_type_hash_itanium.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stu1jgbW
/usr/lib64/clang/8.0.0/lib/linux/stvG2z0Z
/usr/lib64/clang/8.0.0/lib/linux/stvG2z0Z/asan_new_delete.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stvsBq5P
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e/interception_linux.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e/interception_mac.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e/interception_type_test.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e/interception_win.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stw3h53e/sanitizer_allocator.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stwBFtzh
/usr/lib64/clang/8.0.0/lib/linux/stwBFtzh/xray_basic_flags.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stxIrTpZ
/usr/lib64/clang/8.0.0/lib/linux/stxIrTpZ/ubsan_handlers_cxx.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stxIrTpZ/ubsan_type_hash.cc.o
/usr/lib64/clang/8.0.0/lib/linux/stxIrTpZ/ubsan_type_hash_itanium.cc.o