[PATCH] D54941: [clang-tidy] Ignore bool -> single bit bitfield conversion in readability-implicit-bool-conversion

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added inline comments.


================
Comment at: docs/clang-tidy/checks/readability-implicit-bool-conversion.rst:77-78
 
-- boolean expression/literal to integer,
+- boolean expression/literal to integer (conversion from boolean to a single
+  bit bitfield is explicitly allowed),
 
----------------
I think it should only be allowed if the bit-field type is unsigned; signed bit-fields with a single bit are inherently not portable because you don't know if that bit represents a sign bit or a value bit (imagine a sign and magnitude integer representation).

C++20 is changing this by standardizing on two's complement, but earlier versions of C++ (and currently, all versions of C) are still impacted, so another approach is to gate this on the language standard mode that's in effect.


Repository:
  rCTE Clang Tools Extra

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D54941/new/

https://reviews.llvm.org/D54941