[patch, fortran] [5/6 Regression] Line continuation followed by comment character in string fails to compile

[Jerry DeLisle]

* ping *

On 05/13/2015 06:58 PM, Jerry DeLisle wrote:
> The attached patch reverts a change I made for pr65456 which caused this
> regression and adds a check for quotes farther down in the function.  This
> avoids treating a '!' in a string as a comment and wiping the rest of the line.
> 
> I found the added code is needed because an interposing quote was falling
> through and being changed into an empty space at around line 1393. (I do not
> recall the history of why that space is being done)
> 
> The patch also updates test case continuation_13.f90. I found another compiler I
> use for comparison interprets the continuation differently and is inserting a
> space that is not there.  So the format at line 800 is handled differently now
> with gfortran and the line 900 format example is added to test both cases with
> and without a space just before the continuation.
> 
> I think now gfortran has this right, but I do not rule out that I am missing
> some obscure rule.  This begs a question about the space character substituted
> near line 1393 in scanner.c, but at the moment I do not think it is related.
> 
> I have also added a test for the the original problem reported in this PR to
> avoid future repeating of the problem. I will provide a Changelog entry for the
> testsuite changes.
> 
> Regression tested on x86-64-linux.  OK to trunk?  followed to 5.1?
> 
> Regards,
> 
> Jerry
> 
> 
> 2015-05-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
> 
> 	PR fortran/65903
> 	* io.c (format_lex): Change to NONSTRING when checking for
> 	possible doubled quote.
> 	* scanner.c (gfc_next_char_literal): Revert change from 64506,
> 	add a check for quotes, and return.
>