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.
Andrew Sutton
cxx2a.patch
Description: Binary data
