fortran-experiments: patch for error checking, rename, dead code

["Christopher D. Rickett" <crickett at lanl dot gov>]

hi all,

i've attached another patch for the fortran-experiments branch.  my
apologies to the reviewer; the patch is fairly large but contains a number
of functions that were removed because they're not used.

the patch should cover the following:
  - allow symbols from iso_c_binding to be renamed.  this was partially
working before, but there were a number of places where i referred to
the symbols by their names.  i now use the from_intmod/intmod_sym_id
flags that FX added.
  - moved the checking for C interoperability to resolve_symbol since it
was shown by Tobias that checking in decl.c could be too early.
  - allow BIND(C) derived types to have type components (if they are C
interoperable).  this was previously reported as an error, but that
seems incorrect because the draft doesn't say that it shouldn't be
allowed (as far as i can tell).
  - added a few new test cases and updated existing ones.
  - removed functions that were no longer used (haven't been used for a
while either).

ChangeLog entry:

2007-02-19  Christopher D. Rickett  <crickett@lanl.gov>
	* gcc/testsuite/gfortran.dg/c_loc_tests_2.f03: New test case for
	the c_loc function.
	* gcc/testsuite/gfortran.dg/bind_c_implicit_vars.f03: New test
	case for warning user about implicitly typed variables if they
	need to be C interoperable.
	* gcc/testsuite/gfortran.dg/interop_params.f03: Updated test case
	to change the expected line of the warning messages.
	* gcc/testsuite/gfortran.dg/bind_c_array_params.f03: New test case
	to verify that gfortran reports errors if the user declares
	assumed-shape or deferred-shape dummy arguments for a BIND(C)
	procedure.  Only assumed-size or explicitly-shaped arrays are
	allowed.
	* gcc/testsuite/gfortran.dg/bind_c_dts_2.f03: New test case that
	shows gfortran accepting a BIND(C) derived type that contains
	another BIND(C) derived type.  This was previously reported as an
	error.
	* gcc/testsuite/gfortran.dg/binding_label_tests_2.f03: New test
	case to verify that gfortran reports error messages for invalid
	binding labels (error in the NAME= specifier).
	* gcc/testsuite/gfortran.dg/binding_label_tests.f03: New test case
	for verifying that gfortran accepts all valid binding labels.
	* gcc/testsuite/gfortran.dg/bind_c_dts_3.f03: New test case for
	verifying that gfortran correctly checks BIND(C) derived types
	that are nested within another BIND(C) derived type for being C
	interoperable.
	* gcc/testsuite/gfortran.dg/iso_c_binding_rename_1_driver.c: Main
	program for the iso_c_binding_rename_1 test.
	* gcc/testsuite/gfortran.dg/iso_c_binding_rename_1.f03: New test
	case to check that gfortran allows the symbols in iso_c_binding to
	be renamed.
	* gcc/testsuite/gfortran.dg/iso_c_binding_rename_2_driver.c: Main
	program for the iso_c_binding_rename_2 test.
	* gcc/testsuite/gfortran.dg/iso_c_binding_rename_2.f03: New test
	case to check that gfortran allows the symbols in iso_c_binding to
	be renamed.
	* gcc/testsuite/gfortran.dg/bind_c_dts_2_driver.c: Main program
	for the bind_c_dts_2 test case.
	* gcc/testsuite/gfortran.dg/bind_c_usage_2.f03: Updated test case.
	* gcc/testsuite/gfortran.dg/c_loc_tests_2_funcs.c: C functions
	that go with c_loc_tests_2.f03.
	* gcc/testsuite/gfortran.dg/bind_c_usage_3.f03: Updated test case.
	* gcc/fortran/symbol.c: Added warnings for implicitly typed
	variables that need to be C interoperable.  Added
	get_iso_c_binding_dt() for retrieving derived types from
	namespace, independent of the type name.  Changed
	verify_bind_c_derived_type to allow type components.  Updated
	warning/error messages in many cases to not use the *_now
	versions.  Removed dead code: gen_c_interop_kind_sym,
	gen_given_kinds, gen_c_interop_int_kinds,
	gen_c_interop_logical_kinds, gen_c_interop_real_kinds,
	gen_special_c_chars, gen_c_interop_char_kinds,
	gen_c_interop_ptr_syms, gen_c_interop_ptr_kinds, gen_iso_c_proc,
	gen_c_interop_int_funcs, gen_c_interop_kinds.  These were removed
	because they have not been necessary since FX added the
	generate_isocbinding_symbol function.  Updated functions to use
	the from_intmod and intmod_sym_id instead of the symbol names.
	This allows the symbols to be renamed by the user.  Added the
	derived types for c_ptr and c_funptr to the namespace
	derived_types list.
	* gcc/fortran/decl.c: Updated warning/error messages.  Added test
	cases for preventing assumed-shape and deferred-shape arrays as
	parameters to BIND(C) procedures.  Removed verification of C
	interoperability because it is now done during resolve_sym().
	Added an error check for binding labels where a name specifier was
	given with a zero lengthed string.
	* gcc/fortran/gfortran.h: Updated prototypes.
	* gcc/fortran/module.c: Added code to put from_intmod and
	intmod_sym_id in the module file.  This is needed to correctly
	recognize renamed iso_c_binding module symbols.
	* gcc/fortran/trans-types.c: Updated to use from_intmod and
	intmod_sym_id instead of the names for iso_c_binding symbols c_ptr
	and c_funptr.
	* gcc/fortran/resolve.c: Added test in resolve_contained_functions
	to verify the return type of functions that are BIND(C).  Use
	from_intmod and intmod_sym_id to recognize iso_c_binding symbols
	instead of their names.  Added checks to resolve_symbol to verify
	C interoperability for symbols that need to be.  This use to be
	done in decl.c, but it was pointed out that this could be too
        early to check.
	* gcc/fortran/match.c: Updated gfc_match_name_C to handle leading
	or trailing spaces in the name specifier.
	* gcc/fortran/match.h: Updated prototypes.  Moved some to
	gfortran.h.

bootstrapped and regtested on x86 with no new failures.
Chris

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