On Fri, Aug 03, 2007 at 12:51:16AM +0200, Guennadi Liakhovetski wrote: > On Fri, 3 Aug 2007, Stefan Richter wrote: > > > Guennadi Liakhovetski wrote: > > > with > > > > > > char c[4] = "012345"; > > > > > > the compiler warns, but actually allocates a 6-byte long array... > > > > Off-topic here, but: sizeof c / sizeof *c == 4. > > Don't think it is OT here - kernel depends on gcc. And, what I meant, is, > that gcc places all 7 (sorry, not 6 as I said above) characters in the > .rodata section of the compiled object file. Of course, it doesn't mean, > that c is 7 characters long.
So gcc does that kind of recovery, after having warned you. Makes sense, as long as it's for ordinary variables (and not, say it, struct fields) - you get less likely runtime breakage on the undefined behaviour (e.g. passing c to string functions). So gcc has generated some padding between the global variables, that's all. It doesn't change the fact that use of c[4] or strlen(c) or strcpy(..., c) means nasal demon country for you. Now, if gcc does that for similar situation with struct fields, you'd have a cause to complain. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
