On Thu, Jan 22, 2015 at 10:20:01PM +0100, Johannes Schindelin wrote: > On 2015-01-22 20:59, Stefan Beller wrote: > > cc Johannes Schindelin <johannes.schinde...@gmx.de> who is working in > > the fsck at the moment > > > > On Thu, Jan 22, 2015 at 11:43 AM, Michael Blume <blume.m...@gmail.com> > > wrote: > > > >> CC fsck.o > >> fsck.c:110:38: warning: comparison of unsigned enum expression >= 0 is > >> always true [-Wtautological-compare] > >> if (options->msg_severity && msg_id >= 0 && msg_id < FSCK_MSG_MAX) > >> ~~~~~~ ^ ~ > > According to A2.5.4 of The C Programming Language 2nd edition: > > Identifiers declared as enumerators (see Par.A.8.4) are constants of type > int. > > Therefore, the warning is incorrect: any assumption about enum fsck_msg_id to > be unsigned is false.
I'm not sure that made it to ANSI. C99 says (setion 6.7.2.2, paragraph 4): Each enumerated type shall be compatible with char, a signed integer type, or an unsigned integer type. The choice of type is implementation-defined, but shall be capable of representing the values of all the members of the enumeration. I don't have a copy of C89, but this isn't mentioned in the (very cursory) list of changes found in C99. Anyway, that's academic. I think we dealt with a similar situation before, in 3ce3ffb840a1dfa7fcbafa9309fab37478605d08. -Peff -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
