Ken Matsui a1545f51a9 Warn if using elifdef & elifndef in not C2x & C++2b mode ...

This adds an extension warning when using the preprocessor conditionals
in a language mode they're not officially supported in, and an opt-in
warning for compatibility with previous standards.

Fixes #55306
Differential Revision: https://reviews.llvm.org/D125178

2022-05-12 09:26:44 -04:00

2.2 KiB

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