http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51073
--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-11-10 10:01:36 UTC --- I think the size == 0 issue can only happen for static ("save") coarrays such as integer, save :: caf(1:0)[*] print *, size(caf) end For allocatable coarrays, one always allocates at least a single byte. Thus, it should be done in the front end for performance reasons (size is known at the compile time and it is a rather special case). Regarding the RTEMS failures: I somehow doubt that they are related to this issue. I think there should be no size-zero test case for coarrays.