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Re: [PATCH 1/2] fix clang -Wconstant-conversion with bit fields

From
John Keeping <john@keeping.me.uk>
Date
Jan 16, 2013, 23:08 UTC
Message-ID
<20130116230800.GB4574@serenity.lan>
In-Reply-To
<1358376443-7404-1-git-send-email-apelisse@gmail.com>
On Wed, Jan 16, 2013 at 11:47:22PM +0100, Antoine Pelisse wrote:
Show 13 quoted lines
> clang incorrectly reports a constant conversion warning (implicit
> truncation to bit field) when using the "flag &= ~FLAG" form, because
> ~FLAG needs to be truncated.
> 
> Convert this form to "flag = flag & ~FLAG" fixes the issue as
> the right operand now fits into the bit field.
> 
> Signed-off-by: Antoine Pelisse <apelisse@gmail.com>
> ---
> I'm sorry about this fix, it really seems bad, yet it's one step closer
> to warning-free clang compilation.
> 
> It seems quite clear to me that it's a bug in clang.

Which version of clang did you see this with? I don't get these warnings with clang 3.2.

John
Previous: Linus TorvaldsNext: Antoine Pelisse
Message 28 of 35 in “fix some clang warnings”
  1. fix some clang warningsMax Horn, Jan 16, 2013
  2. Jeff KingJan 16, 2013
  3. Junio C HamanoJan 16, 2013
  4. Antoine PelisseJan 16, 2013
  5. John KeepingJan 16, 2013
  6. Max HornJan 16, 2013
  7. Jeff KingJan 16, 2013
  8. Jeff KingJan 16, 2013
  9. Jeff KingJan 16, 2013
  10. John KeepingJan 16, 2013
  11. Jeff KingJan 16, 2013
  12. Antoine PelisseJan 16, 2013
  13. John KeepingJan 16, 2013
  14. Jeff KingJan 16, 2013
  15. John KeepingJan 16, 2013
  16. John KeepingJan 17, 2013
  17. 1/2 fix clang -Wconstant-conversion with bit fieldsAntoine Pelisse, Jan 16, 2013
  18. 2/2 fix clang -Wtautological-compare with unsigned enumAntoine Pelisse, Jan 16, 2013
  19. Antoine PelisseJan 16, 2013
  20. Antoine PelisseJan 17, 2013
  21. John KeepingJan 17, 2013
  22. combine-diff: suppress a clang warningJohn Keeping, Jan 17, 2013
  23. Linus TorvaldsJan 17, 2013
  24. Antoine PelisseJan 17, 2013
  25. John KeepingJan 17, 2013
  26. Phil HordJan 18, 2013
  27. Linus TorvaldsJan 18, 2013
  28. John KeepingJan 16, 2013
  29. Antoine PelisseJan 16, 2013
  30. Antoine PelisseJan 16, 2013
  31. Junio C HamanoJan 16, 2013
  32. Junio C HamanoJan 16, 2013
  33. Tomas CarneckyJan 16, 2013
  34. Matthieu MoyJan 16, 2013
  35. Miles BaderFeb 1, 2013

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