sizeof(_Bool), like for many other types, is ABI-dependent, but that doesn't mean it is illegitimate. I don't think C99 says that it is invalid (which means C99 doesn't permit is to be a packed bitmap.) On February 26, 2014 7:38:46 PM PST, Joe Perches <joe@xxxxxxxxxxx> wrote: >(adding Ben Pfaff and Christopher Li) > >On Wed, 2014-02-26 at 19:29 -0800, H. Peter Anvin wrote: >> On 02/26/2014 06:58 PM, Josh Triplett wrote: >> > On Wed, Feb 26, 2014 at 06:53:14PM -0800, Joe Perches wrote: >> >> Allow an override to emit or not the sizeof(bool) warning >> >> Add a description to the manpage. >> >> >> >> Signed-off-by: Joe Perches <joe@xxxxxxxxxxx> >> > >> > Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx> >> > >> >> I have to admit that this particular warning is a bit odd to me. I'm >> wondering what kind of bugs it was intended to catch. >> >> In particular, things that incorrectly assumes the size of bool to be >> anything in particular would seem unlikely to actually use sizeof(). > >Dunno, the commit log for the commit that added it doesn't quite >match the code and is seemingly unaware that the c99 spec doesn't >specify sizeof(bool). > >Ben Pfaff <blp@xxxxxxxxxx> >Date: Wed May 4 16:39:54 2011 -0700 > > evaluate: Allow sizeof(_Bool) to succeed. > > Without this commit, sizeof(_Bool) provokes an error with "cannot size >expression" because _Bool is a 1-bit type and thus not a multiple of a >full >byte in size. But sizeof(_Bool) is valid C that should evaluate to 1, >so > this commit fixes the problem and adds a regression test. > > Signed-off-by: Ben Pfaff <blp@xxxxxxxxxx> > Signed-off-by: Christopher Li <sparse@xxxxxxxxxxx> -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-sparse" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
