When building with clang, a bunch of warnings popped up.
Most of those are protobuf's rendered code related (implicit conversion long to int) and that appears to be a known issue:
However two of those are stemming from libprocess:
../../../3rdparty/libprocess/src/encoder.hpp:125:3: warning: control may reach end of non-void function [-Wreturn-type]
../../../3rdparty/libprocess/src/process.cpp:1848:1: warning: control may reach end of non-void function [-Wreturn-type]
Unsure if the second one is a false positive.