[patch, libfortran] PR33672 Additional runtime checks needed for namelist reads

[Jerry DeLisle]

:ADDPATCH fortran:

Hi all,

The attached patch provides additional run-time checks to namelist reading to 
assure that namelist file contents comply with the F95 standard.

Since gfortran was permitting bogus qualifiers, this could affect users who may 
have been doing things incorrectly.  However, gfortran does WRITE namelists 
correctly so files generated using gfortran to write them will work fine.

New test case provided.

Regression tested on x86-64.

OK to commit.

Regards,

Jerry

2007-10-07  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/33672
	* io/list_read.c (nml_parse_qualifier): Add character specific error
	messages.  Check for proper form of sub-string qualifiers.  Return the
	parsed_rank flag indicating a non-zero rank qualifier.
	(nml_get_obj_data):  Count the instances of non-zero rank qualifiers.
	Issue an error if more that one non-zero rank qualifier is found.
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