[Bug c/28368] -std=c89 doesn't warn about gcc's "?:" extension

[manu at gcc dot gnu dot org]

------- Comment #6 from manu at gcc dot gnu dot org  2007-03-08 15:52 -------
(In reply to comment #5)
> Subject: Re:  -std=c89 doesn't warn about gcc's "?:" extension
> 
> On Wed, 7 Mar 2007, manu at gcc dot gnu dot org wrote:
> 
> > Sorry, I still don't understand what is the difference between -std=c89 and
> > -std=gnu89.
> 
> -std=c89 accepts C89 programs that conflict with the GNU C89 language.  
> For example, ones using "inline" or "asm" as an identifier, or using any 
> non-reserved identifier predefined as a macro in GNU C (such as "linux" or 
> "i386") or using trigraphs.
> 

That clarifies all perfectly. I think it is not as clear in the manual but
perhaps I am a bit slow. Maybe in -std= it should say:

gnu89
-              Default, ISO C90 plus GNU extensions (including some C99
fea‐
-              tures).
+              Default, subset of ISO C90 that doesn't conflict 
+              with GNU extensions (including some C99 features 
+              that conflict with C90)


In any case, this bug seems invalid to me.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28368