[Bug fortran/47495] .mod files: File modification time - Makefile build issue

[rwild at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47495

--- Comment #4 from Ralf Wildenhues <rwild at gcc dot gnu.org> 2011-01-29 11:48:04 UTC ---
For starters it would be nice if gfortran would even document its precise
semantics for when module files are created/updated/etc.  I'm sure these
semantics are not identical across Fortran compilers.  This is PR 42607.