Hello Jakub,
I must confess that in the last months I've not been able to find much
time (I do this in my spare time) to work on this. Part of the problem
is also that my new employer hasn't yet provided a written copyright
waiver for the FSF, though they have agreed and my contract already
works out well in that regard.
I would very much like to continue this project, but I'm very happy to
collaborate and join forces to get this feature further. I hang out on
the CppSlack as vdeurzen, if you want to contact me on another platform.
Are there other platforms for GCC development that are well suited to
discussing this topic?
Best regards,
Tim.
On 8/30/18 8:16 PM, Marek Polacek wrote:
On Thu, Aug 30, 2018 at 08:07:05PM +0200, Jakub Jelinek wrote:
On Thu, Jan 11, 2018 at 02:06:06PM +0000, Joseph Myers wrote:
On Thu, 11 Jan 2018, David Brown wrote:
Maybe it is easier to say "gcc supports <=> in C++2a, and as an
extension also supports it in C and C++ of any standard" ? I don't
believe there is any way for it to conflict with existing valid code, so
it would do no harm as a gcc extension like that - and C users can then
use it too.
As per previous IRC discussion, changing the lexing to support this
pp-token can break valid code in previous standards, e.g. code
concatenating <=> and >, then stringizing the result (the C++ proposal for
adding this feature also notes some obscure cases where the character
sequence <=> can actually occur as tokens, not just pp-tokens -
"X<&Y::operator<=>" and "x+&operator<=>y" - so of course patches adding
this feature should add testcases using such cases with older -std=
options).
Changes to cpp_avoid_paste (so that preprocessed output does not put a
pp-token starting with > immediately after <=) do not need to be
conditional on the standard version, however.
Here is a patch that attempts to implement this (in libcpp + gcc/testsuite
only so far).
It needs to be parsed and handled in the C++ FE obviously, which is missing.
Thanks.
Tim, have you had any success with this, or should I (or somebody else) feel
free to take it over?
Marek
