https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120978
Harald van Dijk <harald at gigawatt dot nl> changed:
What |Removed |Added
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CC| |harald at gigawatt dot nl
--- Comment #9 from Harald van Dijk <harald at gigawatt dot nl> ---
I think Andrew is right for C++, but wrong for C. The relevant part in the
phases of translation is translation phase 7: "Each preprocessing token is
converted into a token". In C++, although #, ##, %: and %:%: are valid
pp-tokens, they are not valid tokens: https://eel.is/c++draft/lex.token
includes only operator-or-punctuator, not preprocessing-op-or-punc. In C,
however, #, ##, %: and %:%: are included in punctuators, making them valid
tokens, and there does not seem to be any rule disallowing them in a
balanced-token-sequence.
I would be highly surprised if this difference between C and C++ is
intentional.
