Fix spaceship operator bugs, document, add tests

Remove some erroneously added brackets_increment() calls.

Reject <=> in preprocessor expressions with a clear error message (it
seems it isn't supported here - clang and gcc don't at least).

The type returned by `<=>` is not `bool`.  We pretend it's
`int` for now, which should work for how it's likely to be used
in constant expressions.

Fixes #1622
This commit is contained in:
Olly Betts 2022-03-09 10:08:17 +13:00
commit 02b4bd8eca
10 changed files with 91 additions and 7 deletions

View file

@ -31,3 +31,5 @@ pp_expressions_bad.i:64: Warning 202: Could not evaluate expression '"1" == ~"1"
pp_expressions_bad.i:64: Warning 202: Syntax error: attempt to apply unary operator to string
pp_expressions_bad.i:67: Warning 202: Could not evaluate expression '"1" == +"1"'
pp_expressions_bad.i:67: Warning 202: Syntax error: attempt to apply unary operator to string
pp_expressions_bad.i:71: Warning 202: Could not evaluate expression '(4 <=> 2) < 0'
pp_expressions_bad.i:71: Warning 202: Spaceship operator (<=>) not allowed in preprocessor expression