[Bug c++/69865] -trigraphs option broken

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69865

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-02-18
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Bernd Edlinger from comment #2)
> in gcc/c-family/c-opts.c:
> 
> following code in line 805:
> 
>   /* Set C++ standard to C++14 if not specified on the command line.  */
>   if (c_dialect_cxx () && cxx_dialect == cxx_unset)
>     set_std_cxx14 (/*ISO*/false);

The default for C is set in c_common_init_options, which seems more logical.

> 
>     case OPT_trigraphs:
>       cpp_opts->trigraphs = 1;
>       break;


If you use CPP(trigraphs) in c.opt, this code is auto-generated (and also the
default of libcpp becomes the default of GCC, unless overriden).