[Bug fortran/47486] gfortran -M exits with fatal error when -o option is used

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47486

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org,
                   |                            |dfranke at gcc dot gnu.org

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-01-27 08:31:56 UTC ---
In the compiler, the file name is handled in cpp.c via
gfc_cpp_option.output_filename -- but that part looks OK.

It seems to be a driver problem as the driver passes:
.../x86_64-unknown-linux-gnu/4.6.0/f951 ... -o test.d ... -o /tmp/cckDPYJ6.s

Thus, either a rule in lang-specs.h is wrong/missing or the problem is in
gfortranspec.c.

I think something like:   %{!o*:-o %b.s}  is missing and %b.s allways is
implicitly used.

Maybe %(cpp_unique_options) should be used? Currently, lang-specs.h contains
the following:

/* Identical to gcc.c (cpp_options), but omitting %(cpp_unique_options)
   and -fpch-preprocess on -save-temps.  */
#define CPP_ONLY_OPTIONS    "%1 %{m*} %{f*} %{g*:%{!g0:%{g*} \
                             %{!fno-working-directory:-fworking-directory}}} \
                             %{std*&ansi&trigraphs} %{W*&pedantic*} %{w} \
                             %{O*} %{undef}"

The %b.s seems to be defined in gcc.c's cc1_options.