On 8 January 2018 at 22:07, Jason Merrill wrote: > On Mon, Jan 8, 2018 at 4:07 PM, Tim van Deurzen <t...@kompiler.org> wrote: >> I've been spending some time the past few weeks implementing p0515r2, >> i.e. the proposal for consistent comparisons for C++ (aka the spaceship >> operator). > > Great! > >> I've received some very valuable help on the IRC channel, but >> I'm still a little bit stuck. Note, I'm completely new to the GCC >> codebase and am very much still getting oriented. >> >> Following advice from some of the people in IRC channel I implemented >> parsing the new token in libcpp and I seem to be successfully parsing it >> and creating a new AST node. As this feature is not in the C++ standard >> yet, I wanted to add a command line flag to enable usage of the new >> operator and ignoring it otherwise. I managed to get cc1plus to accept >> the parameter, but it seems that when I invoke my own g++ binary with >> that parameter, it complains about unknown parameters. >> >> I'm perfectly happy to dig further on my own, but I get the feeling I'm >> missing some documentation / resource somewhere that might help me out. >> Is there some documentation about adding and passing around parameters >> that will be used both in libcpp and the C++ front-end? What would be >> the best place to look to learn more about how part of GCC this is >> structured? I want to make sure I go about this correctly. > > There's a gccint.info documentation file, the Options node seems like > what you're looking for. You will want to add a new option to > c-family/c.opt.
operator<=> is now in the working paper though, so does it need its own option? IMHO it should just be enabled for -std=c++2a and -std=gnu++2a, and not otherwise.
