------- Comment #40 from ubizjak at gmail dot com 2009-09-30 08:12 ------- (In reply to comment #39)
> > static tree > > build_function_type_list_1 (bool vaargs, tree return_type, va_list argp) > > Passing va_list by value is non-portable. One fix here is to pass argp > by reference. Dunno if that fixes this problem though, since the main > problem for Alpha seems to be the stdarg thing. Regarding non-portability of va-arg, I have found an interesting explanation at [1] which I qoute here for reference: <quote> If you go on to more complex cases than asked and shown, one thing that is *not* well defined is using the same va_list in the caller after the callee returns. In particular, it is not specified by the Standard whether va_list is an array type and hence passed "by reference" (that is, by decayed pointer) and shared, or a type like a pointer or struct that is passed by value and not shared. If this is an issue, pass an explicit pointer (and dereference) to force sharing, or in C99 only use va_copy and a second va_list, in either the caller or callee, to prevent it. </quote> I don't think that sharing is the problem in this particular case, since we just call va_end after va_list is passed to the function. [1] http://www.velocityreviews.com/forums/t317863-valist-usage.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41395
