http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48858
--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-01-07 22:14:15 UTC --- See also discussion starting at http://j3-fortran.org/pipermail/j3/2008-December/002123.html Fortran 2003 has in "16.1 Scope of global identifiers" "Program units, common blocks, external procedures, and entities with binding labels are global entities of a program. The name of a program unit, common block, or external procedure is a global identifier and shall not be the same as the name of any other such global entity in the same program, except that an intrinsic module may have the same name as another program unit, common block, or external procedure in the same program. A binding label of an entity of the program is a global identifier and shall not be the same as the binding label of any other entity of the program; nor shall it be the same as the name of any other global entity of the program that is not an intrinsic module, ignoring differences in case. An entity of the program shall not be identified by more than one binding label." Fortran 2008 has in "16.2 Global identifiers" - the "{>>}"/"{<<}" was added by me for emphasis. "Program units, common blocks, external procedures, entities with binding labels, external input/output units, pending data transfer operations, and images are global entities of a program. The name of a common block with no binding label, external procedure {>>}with no binding label{<<}, or program unit that is not a submodule is a global identifier. The submodule identifier of a submodule is a global identifier. A binding label of an entity of the program is a global identifier. An entity of the program shall not be identified by more than one binding label. The global identifier of an entity shall not be the same as the global identifier of any other entity. Furthermore, a binding label shall not be the same as the global identifier of any other global entity, ignoring differences in case." See also: http://www.j3-fortran.org/doc/year/08/08-295.txt ; we might need to handle also "COMMON /foo/" where "foo" is also no global identifier any more. (I don't know whether one needs to handle it somewhere.) Cf. also http://j3-fortran.org/doc/year/08/08-196.txt http://j3-fortran.org/doc/year/08/08-187.txt F03/0076 at http://j3-fortran.org/doc/year/08/08-006Ar4.txt
