[PATCH Fortran/Diagnostics] Move Fortran to common diagnostics machinery

[Manuel López-Ibáñez <lopezibanez at gmail dot com>]

This is the first step for moving Fortran to use the common
diagnostics machinery. This patch makes Fortran use the common
machinery for those warnings that don't have a location or a
controlling option.

Before:

manuel@gcc10:~/test1$ echo end | ./213518/build/gcc/f951
-fdiagnostics-color -Werror -x -
f951: error: command line option '-x -' is valid for the driver but
not for Fortran
Warning: Reading file '<stdin>' as free form

After:

manuel@gcc10:~/test1$ echo end | ./213518M/build/gcc/f951
-fdiagnostics-color -Werror -x -
f951: Error: command line option '-x -' is valid for the driver but
not for Fortran
f951: Error: Reading file '<stdin>' as free form [-Werror]

(Plus the colors that you cannot see in this mail).

Bootstrapped and regression tested on x86_64-linux-gnu.

OK?

2014-08-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR fortran/44054
c-family/
    * c-format.c: Handle Fortran flags.
    * diagnostic.c (build_message_string): Make it extern.
    * diagnostic.h (build_message_string): Make it extern.
fortran/
    * gfortran.h: Define GCC_DIAG_STYLE.
    (gfc_diagnostics_init,gfc_warning_cmdline): Declare.
    * trans-array.c: Include gfortran.h before diagnostic-core.h.
    * trans-expr.c: Likewise.
    * trans-openmp.c: Likewise.
    * trans-const.c: Likewise.
    * trans.c: Likewise.
    * trans-types.c: Likewise.
    * f95-lang.c: Likewise.
    * trans-decl.c: Likewise.
    * trans-io.c: Likewise.
    * trans-intrinsic.c: Likewise.
    * error.c: Include diagnostic.h and diagnostic-color.h.
    (gfc_diagnostic_build_prefix): New.
    (gfc_diagnostic_starter): New.
    (gfc_diagnostic_finalizer): New.
    (gfc_warning_cmdline): New.
    (gfc_diagnostics_init): New.
    * gfc-diagnostic.def: New.
    * options.c (gfc_init_options): Call gfc_diagnostics_init.
    (gfc_post_options): Use gfc_warning_cmdline.

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