[patch, fortran] PR35420, PR36421, PR35422 g0, gw.d, and a0 format descriptors

[Jerry DeLisle]

Hi,

This patch resolves these PRs and is fairly self explanatory.  It adds the new 
F2008 g0 feature.  I will update the doc files after I get this patch in.  My 
tree is getting cluttered and that makes me nervous.

Regression tested on x86-64. Three new test cases provided.

OK for commit?

Jerry

2008-06-07  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/36420, 36422
	* io.c (check_format): Add new error message for zero width. Use new
	error message for FMT_A and with READ, FMT_G.  Allow FMT_G with WRITE
	except when -std=F95 and -std=F2003.

2008-06-07  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/36420, 36421, 36422
	* io.h: Add prototype for write_real.
	* transfer.c (formatted_transfer_scalar): For FMT_G and width zero, use
	write_real.
	* format.c: Add zero width error message. (parse_format_list): Use error
	message for FMT_A if followed by FMT_ZERO. Use zero width error message
	for FMT_G if mode is READ or if -std=f95 or f2003. (fmormat0): Fix type
	in comment.
	* write.c (write_a): Set wlen to len if FMT_G and length is zero.
	(write_l): Add wlen variable and use it if FMT_G and width is zero.
	(write_decimal): If FMT_G, set m to -1 to flag processor dependent
	formatting. (write_real): Remove static declaration.
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