================
@@ -2068,7 +2068,8 @@ bool Lexer::LexNumericConstant(Token &Result, const char
*CurPtr) {
}
// If we have a digit separator, continue.
- if (C == '\'' && (LangOpts.CPlusPlus14 || LangOpts.C23)) {
+ if (C == '\'' &&
+ (LangOpts.CPlusPlus14 || LangOpts.C23 || ParsingPreprocessorDirective)) {
----------------
jansvoboda11 wrote:
We've been trying to avoid specializing Clang itself for dependency scanning.
Instead, we have introduced generic feature flags that the scanner uses to
tweak the compiler behavior. I think this is better for layering and also
forces us to name those features, making the code self-documenting. People
working on Clang don't have to wonder what's dependency scanning and why it
needs to lex numeric literals differently; they just see there's a feature flag
named `AllowLiteralDigitSeparator` that just makes sense in that context. You
can still dive deeper and find that it's the scanner that enables that feature
of course.
So I'm not a fan of introducing `LanguageOpts::ScanningDependencies`.
https://github.com/llvm/llvm-project/pull/95798
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