[patch] Add -static-libgfortran to gcc.c and Fortran driver

[François-Xavier Coudert]

Attached patch adds a -static-libgfortran option that links the static
libgfortran library on systems where the linker supports
-Bdynamic/-Bstatic. This is an update of my previous patch
(http://gcc.gnu.org/ml/gcc/2007-04/msg00680.html). The name of the
option was changed from -fstatic-libgfortran to -static-libgfortran
for consistency with -static-libgcc.

This change in the option name requires a one-line addition to gcc.c,
in order to validate this option that has a name that doesn't start
with -f. I don't know who exactly can approve this change, I think it
qualifies as "driver".

Bootstrapped, regtested and manually tested on i686-linux. OK for
mainline? (for both the Fortran and gcc.c parts)




:ADDPATCH driver:

2007-05-07  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

        * gcc.c (process_command): Recognize the new -static-libgfortran
        option.


2007-05-07  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

        * lang.opt (static-libgfortran): New option.
        * gfortranspec.c (ADD_ARG_LIBGFORTRAN): New macro.
        (Option): Add OPTION_static and OPTION_static_libgfortran.
        (lookup_option): Handle the new -static-libgfortran option.
        (lang_specific_driver): Check whether -static is passed.
        Handle the new -static-libgfortran option.
        * options.c (gfc_handle_option): If -static-libgfortran is
        passed and isn't supported on this configuration, error out.
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