On Thu, Mar 02, 2006, Andreas Oberritter wrote: > On Thu, 2006-03-02 at 00:53 +0100, Johannes Stezenbach wrote: > > The System V generic ABI http://www.caldera.com/developers/gabi/ > > says enums sizes are processor specific, the psABI for i386 and MIPS > > say enums have the same size as int. For other platforms I don't know > > but according to google ARM seems to have -fshort-enums as default. > > Sigh... > > I wonder why it is so important to know the size of an enum at all. > Complete backwards compatibility is needed for desktop systems only, > where users mix different precompiled software versions. There, on i386 > and probably others, we already have 32 bit enums. Maybe they are even > larger on 64 bit systems. If the size of an enum changes on an embedded > platform like ARM, because the kernel headers changed, then it is very > likely that the userspace software will be recompiled, too. Well, I got a bit distracted by this issue, I had to find out the facts so I can sleep at night ;-) But I agree with you, possibly breaking ARM binary compatibility by introducing new enum values isn't something I am personally worried about. PPC and MIPS have 32bit enums, and x86/46 and the like too (int is 32 bits, long is 64 bits == sizeof(void *)). Johannes _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
