Definition of a builtin function - Rebuild of the Debian archive with clang

"Definition of a builtin function" build failure(s)
clang 3.4.2

Versions: 2.9 - 3.0 - 3.1 - 3.2 - 3.3 - 3.4 - 3.4.2 - 3.5.0 - 3.6.0 - 3.8.1 - 3.9.1 - 4.0.1 - 5.0 - 6.0 - 8.0.1 - 9.0.1 - 10.0.0 - 11.0.0 - 12.0.1 - 13.0.0

Package	Version	Supposed error message	Full log
db	5.1.29-8	../src/dbinc/atomic.h:179:19: error: definition of builtin function '__atomic_compare_exchange'	Log
db5.3	5.3.28-3	../src/dbinc/atomic.h:179:19: error: definition of builtin function '__atomic_compare_exchange'	Log
scratchbox2	2.2.4-1debian1	../preload/mempcpy.c:53:7: error: definition of builtin function '__builtin_mempcpy'	Log

3 errors

Debian Package rebuild