operator<=> not supported?

[Cecil Burlingame]

I am using 2.3 and --std==c++20. I just added some code using operator<=> for the first time, and cppcheck complains about it. It does compile and run correctly under GCC 10.2, however.

Here is the cppcheck output for that code:

Compare.C:16:35: error: syntax error: <= > [syntaxError]
if ( auto comp = ( leg1->Date() <=> leg2->Date() ); comp != 0 )

Is there an option that will allow cppcheck to support this yet?

[Daniel Marjamäki]

This operator is not handled yet by cppcheck.. well if you would be interested to help us add handling for it let me know. I think adding it to the ast should be relatively easy. then it needs proper ValueType and some handling in the ValueFlow..

[Cecil Burlingame]

I use cppcheck a lot, but have never looked at its source code. I think it would take me a very long time to contribute such an enhancement. I would not mind paying a small bounty if someone could do it.

[Daniel Marjamäki]

hmm.. I think there are these tasks:
* update preprocessor/tokenizer so it outputs a single token : ~30 minutes
* AST : ~30 minutes
* ValueType : 10 minutes
* ValueFlow: 1 hour

Then probably we want to tweak some code here and there, for instance isOppositeExpression.