tahonermann added inline comments.
================
Comment at: clang/include/clang/Basic/DiagnosticLexKinds.td:116-117
"source file is not valid UTF-8">;
+def warn_invalid_utf8_in_comment : Warning<
+ "invalid UTF-8 in comment">, InGroup<DiagGroup<"invalid-utf8">>,
DefaultIgnore;
def err_character_not_allowed : Error<
----------------
aaron.ballman wrote:
> What would it take to enable the diagnostic by default? We don't typically
> add off-by-default diagnostics because there's evidence that not many folks
> enable them.
>
> Alternatively, would this make sense as a pedantic warning? It's not really
> an extension for us to accept this stuff, but it seems like we can still
> pedantically diagnose the code?
I agree with enabling this by default in at least some warning mode. Aaron's
suggestion of making it a pedantic warning seems reasonable to me.
================
Comment at: clang/lib/Lex/Lexer.cpp:2405-2406
// Skip over characters in the fast loop.
- while (C != 0 && // Potentially EOF.
- C != '\n' && C != '\r') // Newline or DOS-style newline.
+ // Warn on invalid UTF-8 if the corresponding warning is enabled, emitting
a
+ // diagnostic only once per sequence that cannot be decoded.
+ while ((!WarnOnInvalidUtf8 || isASCII(C)) && C != 0 && // Potentially EOF.
----------------
I think it would be helpful to include a link to [[
http://unicode.org/review/pr-121.html | Unicode PR issue 121 ]] here and note
that the diagnostic follows policy option 1. Likewise for handling of '//'
comment styles below. Alternatively, provide the link and a note in the release
notes.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D128059/new/
https://reviews.llvm.org/D128059
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