Qianqian Fang <fangqq@xxxxxxxxx> writes: > On 06/06/2010 11:37 PM, Ian Lance Taylor wrote: >> >> As far as I know drand48 is not in POSIX. It's in the SVID and it's >> in X/Open, but I don't think it's in POSIX proper. And as far as I >> know drand48_r is just a GNU extension to drand48. But it's certainly >> possible that POSIX picked this up somewhere. >> > > thanks for the quick response. I have a silly question though: > which standard are supposed to be supported by ggc of all > platforms? POSIX? SVID? c99? gcc is only a compiler. It fully supports the C90 standard with respect to compiler behaviour. It mostly supports the C99 standard; exact C99 status can be found at http://gcc.gnu.org/c99status.html . However, all these standards also specify library behaviour. gcc does not include a library. gcc can be used with a POSIX compliant library to support a full POSIX compilation environment, but gcc does not itself provide a POSIX compliant library. I believe that Windows has a POSIX mode but it is not the usual Windows programming environment and I don't know how well it works. As far as I know Mac OS X provides a POSIX library. Ian
