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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/55534] -Wno-missing-include-dirs does not work with
 gfortran
Date: Fri, 17 Sep 2021 09:42:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55534

--- Comment #11 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The problem is an ordering problem.


Namely:

* toplev.c calls:
  lang_hooks.init_options (save_decoded_options_count, save_decoded_options=
);

which in turn is:

gfc_init_options ( ....
{
  ...
  SET_OPTION_IF_UNSET (&global_options, &global_options_set,
                       cpp_warn_missing_include_dirs, 1);
...
  /* Initialize cpp-related options.  */
  gfc_cpp_init_options (decoded_options_count, decoded_options);
...
}

Thus, cpp_warn_missing_include_dirs is enabled.


Now:
  decode_options (&global_options, &global_options_set, ...
is run, which calls:
  read_cmdline_options (opts, opts_set, ...
  =E2=86=92 read_cmdline_option
    =E2=86=92 handle_option
      =E2=86=92 gfc_handle_option
        =E2=86=92 gfc_add_include_path
          =E2=86=92 gfc_warning_now

and only afterwards decode_options invokes:
  set_option (...)
which then sets:
  global_options_set->x_... =3D 1
and
  global_options->x_...  =3D commandline option.
and disables the already shown warning.=