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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/66605] -Wunused-parameter causes internal compiler error with gfortran 5.1.0
Date: Wed, 24 Jun 2015 19:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66605

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> BTW, is the resulting warning actually correct?

According the gfortran manual

-Wunused-parameter
Contrary to gcc's meaning of -Wunused-parameter, gfortran's implementation of
this option does not warn about unused dummy arguments (see
-Wunused-dummy-argument), but about unused PARAMETER values. -Wunused-parameter
is implied by -Wextra if also -Wunused or -Wall is used. 

If I understand correctly the above statement, -Wunused-parameter should not
emit a warning for the test in comment 0: there is no parameter. The warning
should be issued with -Wunused-dummy-argument

pr66605.f90:5:25:

 SUBROUTINE sub (neq, time, y, dydt)
                         1
Warning: Unused dummy argument 'time' at (1) [-Wunused-dummy-argument]