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Add -std=c++2a

Message ID 20170720172747.GB284@x4
State New
Headers show

Commit Message

Markus Trippelsdorf July 20, 2017, 5:27 p.m. UTC 
On 2017.07.20 at 19:04 +0200, Markus Trippelsdorf wrote:
> On 2017.07.20 at 09:33 -0400, Andrew Sutton wrote:
> > This adds a new C++ dialect, enabled by -std=c++2a.
> > 
> >         libcpp/
> >         Add support for C++2a.
> >         * include/cpplib.h (c_lang): Add CXX2A and GNUCXX2A.
> >         * init.c (lang_defaults): Add rows for CXX2A and GNUCXX2A.
> >         (cpp_init_builtins): Set __cplusplus to 201707L for C++2x.
> > 
> >         gcc/c-family/
> >         Add support for -std=c++2a.
> >         * c-common.h (cxx_dialect): Add cxx2a as a dialect.
> >         * opt.c: Add options for -std=c++2a and -std=gnu++2a.
> >         * c-opts.c (set_std_cxx2a): New.
> >         (c_common_handle_option): Set options when -std=c++2a is enabled.
> > 
> >         gcc/testsuite/
> >         New test for -std=c++2a.
> >         * g++.dg/cpp2a/cplusplus.C: New.
> 
> Perhaps you should enable -fconcepts by default?

On top of your patch:
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Patch

diff --git a/gcc/c-family/c-opts.c b/gcc/c-family/c-opts.c
index eed9e72b17f0..a923c3e9eedf 100644
--- a/gcc/c-family/c-opts.c
+++ b/gcc/c-family/c-opts.c
@@ -1626,6 +1626,7 @@  set_std_cxx2a (int iso)
   flag_isoc94 = 1;
   flag_isoc99 = 1;
   flag_isoc11 = 1;
+  flag_concepts = 1;
   cxx_dialect = cxx2a;
   lang_hooks.name = "GNU C++17"; /* Pretend C++17 until standardization.  */
 }