Is testing libgomp outside of the build tree supported?

[Paul Pluzhnikov]

Greetings,

We test GCC without access to the build tree (we only have convenient access to
install and source trees).

Building libgomp.c/affinity-1.c and libgomp.c++/affinity-1.C fails in
such testing, because of '#include "config.h"' which is nowhere to be
found.

Is that a bug?
Should I open a bugzilla issue for it?

Thanks,