On 2009-05-14 05:49Z, Nicholas Sherlock wrote: > David Billinghurst wrote: > > Nicholas Sherlock wrote: > >> Hey everyone, > >> > >> I'm trying to use the function rand_r with gcc-4 in Cygwin 1.7, all > my packages are up to date. It's supposed to be defined in stdlib.h, and > I can see it there. But if I compile a program which uses it, I get: > >> > >> warning: implicit declaration of function 'rand_r'. > >> > >> The reason seems to be the check for #ifndef __STRICT_ANSI__ in > stdlib.h. Even though I'm compiling with -std=c99, __STRICT_ANSI__ still > gets declared, so the definition of rand_r is unavailable. This seems to > be the same problem stated here:
'-std=c99' correctly gives a diagnostic because rand_r() is not in C99. > > Try -std=gnu99. It doesn't define __STRICT_ANSI__ > > > > This doesn't answer your question, unfortunately. > > Thanks, that does solve my immediate problem. But I'm really hoping to > compile as vanilla C99 as I can manage, since I'll also be using my code > with non-GNU compilers. If you want consistently identical results with different compilers, then you'll need to write your own routine anyway (which you can do in strictly-conforming C). See the rationale for myrand() here: http://www.opengroup.org/onlinepubs/000095399/functions/rand.html -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
