aaron.ballman added inline comments.
================
Comment at: clang/include/clang/Basic/DiagnosticLexKinds.td:698
+def warn_c2x_compat_pp_directive : Warning<
+ "use of a '#%select{elifdef|elifndef}0' directive is incompatible with C
standards before C2x">,
+ InGroup<CPre2xCompat>, DefaultIgnore;
----------------
(You may also need to rewrap to 80 col limits.)
And do the same for the other three, so that you can use `PPElifDiag` for it.
================
Comment at: clang/lib/Lex/PPDirectives.cpp:663
+
+ Diag(Tok, DiagID) << (IsElifDef ? PED_Elifdef : PED_Elifndef) - 1;
+
----------------
I like the way you're thinking about this, but I don't like how clever the code
is. I'd rather update the comment on `PPElifDiag` to mention
`warn_*_compat_pp_directive` and `ext_*_pp_directive`, and then update those
diagnostics to have a bogus select slot for the `PED_Elif` that will never be
used.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D125178/new/
https://reviews.llvm.org/D125178
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