[Bug fortran/62162] New: Gfortran produces incorrect dependency files when using -MQ

[jpakkane at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62162

            Bug ID: 62162
           Summary: Gfortran produces incorrect dependency files when
                    using -MQ
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jpakkane at gmail dot com

Create a simple Fortran file stuff.f95 that looks like this:

MODULE Circle
   REAL, PARAMETER :: Pi = 3.1415927
   REAL :: radius
END MODULE Circle

Then compile it with this:

gfortran -cpp -MD -MQ stuff.f95.o -o stuff.f95.o -c stuff.f95

Then print the output of the dependency file, which looks like this:

stuff.o stuff.f95.o circle.mod: stuff.f95

The bug here is that Gfortran writes both the default target (stuff.o) and the
one specified with -MQ (stuff.f95.o). It should only print the latter.

The same happens if you use -MT instead of -MQ.