On Wed, Oct 11, 2000 at 12:40:41AM -0400, Tim Peters wrote: > We need a glibc expert! Anyone qualify? No, at least not me ;) > So the remaining question is why the same exp from the same library has > different errno behavior depending on which version of Python it's called > from. *That* one we couldn't answer, after a fruitless time digging thru > the Byzantine glibc source code trying to reverse engineer it. Their exp > *can* display different error behavior at runtime depending on several > obscure things, but they're too obscure to relate back clearly to anything > Python is doing. Well, I've seen & heard about compilers doing slightly different things depending on ANSI or K&R style C, so perhaps the presence of ANSI C definitions triggered this. I sincerely doubt it, though, but you never know, and it's fairly easy to test. > I don't know what to do next. I can't pursue it myself, and you've seen > from the lack of replies to your posts that I'm the only who'll even listen > to you <wink>. Guido suggests that one big change in 2.0 is that we're > including a lot more std headers than we used to. It could well be that one > of those #defines some God-forsaken preprocessor symbol one of whose five > meanings (documented or not) is "use POSIX-conformant libm error reporting", > but which someone #include'd in 2.0 to make (who knows?) sockets work right > on some other flavor of Unix. Don't know. Unix config is a mess, and so is > glibc. Best hope now is for someone intimately familiar with glibc > internals to jump in and own this. Actually, there was some activity to define the right combination of _GNU_SOURCE, _POSIX_SOURCE, _XOPEN_SOURCE, _BSD_SOURCE, et al, but I'm not sure what the end result was. If any #define changes the behaviour of glibc, these would definately be it ! A simple test might be to compile 1.5.2 with the config.h from 2.0, and manually add whatever _*_SOURCE defines aren't in 1.5.2. (They reside in Python.h and config.h, currently.) I'll see if I can reproduce it on the glibc almost-2.2 (that is, glibc-2.1.94) systems here, and do some of the above tests. Computers-suck-ly y'rs, -- Thomas Wouters <thomas@xs4all.net> Hi! I'm a .signature virus! copy me into your .signature file to help me spread!
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