rsmith added inline comments.
================
Comment at: include/clang/Basic/DiagnosticSemaKinds.td:3147-3149
+def warn_impcast_literal_to_bool : Warning<
+ "implicit conversion from %0 to %1; will always evaluate to "
+ "'%select{false|true}2'">, InGroup<LiteralConversion>;
----------------
Warning groups are cheap, and fine-grained groups give users a way to
incrementally roll out our new improved warnings. Can we retain the
string-conversion group and add a new warning flag for the new cases (both as
subgroups of literal-conversion), rather than rolling them into a single group?
I think this diagnostic text is worse for the string literal case than the old
text: the type of the string literal is not relevant to the warning, and
displaying it seems confusing. For consistency, something like "implicit
conversion from string literal to 'bool'; will always evaluate to 'true'" would
work.
Also, please include the word "literal" in the version of this warning for
floating-point and character literals. (And actually, maybe using the "implicit
conversion from floating-point literal to 'bool' [...]" formulation would be
clearer there too, rather than listing a largely-irrelevant type.)
https://reviews.llvm.org/D15935
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