On 01/08/2018 02:07 PM, Tim van Deurzen wrote:
Hi,
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). 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.
As Jonathan mentioned, you may not need a new option for this.
But it's useful to know how to add one in any case. Reading
the manual is a good idea but the easiest way to actually add
one by far is to look at a simple change that adds in git or
svn log one and follow its example. This command will give you
such a list: git log -p --grep="New option" Then just look for
an option that affects the front-end. A warning options might
be a good example.
Martin
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.
If this is the wrong place to ask for help, please redirect me, so that
I don't unnecessarily spam the wrong mailing list :-).
Kind regards,
Tim.
