[PATCH] D144654: [Lex] Warn when defining or undefining any builtin macro

[John Brawn via Phabricator via cfe-commits]

john.brawn added a comment.

gcc has the same warning so I wasn't expecting this cause to change problems, but looking more closely at gcc's behaviour it looks like it only warns for some builtin macros and not others (though glancing over the gcc source code it's not clear which macros and for what reason).

I'll look at this some more and see if I can improve the behaviour.


Repository:
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https://reviews.llvm.org/D144654