Hello,

llvm4 has this conditional:

%if 0%{?sle_version} <= 130000
BuildRequires:  gcc6
BuildRequires:  gcc6-c++
%else
BuildRequires:  gcc
BuildRequires:  gcc-c++
%endif

Since TW has no sle_version you get gcc6 on TW which is probably not intended.

However, llvm4 is the only llvm which passes test on arm64 which may be the
result of building with gcc6.

Also lldb4 has

ExclusiveArch:  arm x86_64

arm is not an arch so this will build on x86_64 only. Maybe it was supposed to
be %arm or armv7 or ... ?