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The following is reproduced without comment from the Debian bug
report system.

From: Ian Jackson <ijackson@chiark.chu.cam.ac.uk>
To: Debian bugs submission address <debian-bugs@pixar.com>
Subject: GCC accepts multi-line strings without \ or " " &c

Package: gcc
Version: 2.7.2-5, 2.7.2.1-3

See the transcript below.  The authors may consider this a `language
extension', though it isn't documented in `(gcc.info.gz)Warning
Options' or `C Dialect Options' or in the table in `C Extensions'.

If so there should definitely be a separate option to generate a
warning for it, and I'd argue that -Wall ought to enable it.

chiark:~/junk> cat t.c
void spong(void) {                                    
  (void)"this is a string                                       
         with missing stuff";
}
chiark:~/junk> gcc -Wall -c t.c                                        
chiark:~/junk> gcc -Wall -ansi -c t.c                        
chiark:~/junk> gcc -Wall -pedantic -c t.c                             
t.c:2: warning: string constant runs past end of line
t.c: In function `spong':
t.c:2: warning: ANSI C forbids newline in string constant
chiark:~/junk> gcc -Wall -ansi -pedantic -c t.c
t.c:2: warning: string constant runs past end of line      
t.c: In function `spong':                   
t.c:2: warning: ANSI C forbids newline in string constant
chiark:~/junk>                                                         

Ian.