"Embedded directive has undefined behavior" build failure(s) — clang 3.4.2

PackageVersionSupposed error messageFull log Bug report
guacamole-server 0.8.3-1daemon.c:415:2: error: embedding a directive within macro arguments has undefined behavior [-Werror,-Wembedded-directive] Log
libssh 0.6.3-2sample.c:87:2: error: embedding a directive within macro arguments has undefined behavior [-Werror,-Wembedded-directive] Log
radsecproxy 1.6.2-1radsecproxy-hash.c:21:2: error: embedding a directive within macro arguments has undefined behavior [-Werror,-Wembedded-directive] Log

3 errors