[Bug fortran/37468] unknown option -i<something> not recognized by gfortran driver

["dfranke at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #6 from dfranke at gcc dot gnu dot org  2008-11-28 23:02 -------
In gcc.c (cpp_unique_options) we have "%{i*}" which passes on any -i<something>
it might encounter, including -i8. This is why we get an error if preprocessing
is enabled, as -i8 is not known. So, the problem is not getting an error with
.F, but getting no error with .f!

Now, looking for the whereabouts of -i8, one sees with -v that it's not passed
to f951, hence it was eaten by the driver?! Interestingly, using -k8, the
compiler complains: "unrecognized option '-k8'". In gcc.c (main) we find:

  /* Now we have the specs.
     Set the `valid' bits for switches that match anything in any spec.  */

  validate_all_switches ();

Which includes the cpp-spec which uses (cpp_unique_options). Thus, we have a
pass interested in the '-i8', namely cpp, which then is never run. In order to
make f951 complain about -i*, we need to forward it in the specs. Otherwise it
will be simply skipped - to be used with a pass never run.


Propsed patch for trunk/4.4 (not regtested yet):

Index: lang-specs.h
===================================================================
--- lang-specs.h        (revision 142255)
+++ lang-specs.h        (working copy)
@@ -23,7 +23,7 @@

 #define F951_CPP_OPTIONS "%{!nocpp: -cpp %g.f90 %(cpp_options)\
                           %{E|M|MM:%(cpp_debug_options) -fsyntax-only} %{E}}"
-#define F951_OPTIONS     "%(cc1_options) %{J*} %{!cpp: %{I*}}\
+#define F951_OPTIONS     "%(cc1_options) %{J*} %{!cpp: %{I*} %{i*}}\
                           %{!nostdinc:-fintrinsic-modules-path finclude%s}\
                           %{!fsyntax-only:%(invoke_as)}"
 #define F951_SOURCE_FORM  "%{!ffree-form:-ffixed-form}"


-- 

dfranke at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dfranke at gcc dot gnu dot
                   |                            |org
         AssignedTo|unassigned at gcc dot gnu   |dfranke at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   GCC host triplet|(amd64 - Debian testing  -  |
                   |gfortran-4.3                |
           Keywords|                            |patch
   Last reconfirmed|2008-09-14 14:20:15         |2008-11-28 23:02:59
               date|                            |
            Summary|error when combining -i8    |unknown option -i<something>
                   |with .F files               |not recognized by gfortran
                   |                            |driver


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37468