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From: Nicholas Sherlock <n DOT sherlock AT gmail DOT com>
Subject:  Using rand_r
Date:  Thu, 14 May 2009 17:27:49 +1200
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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:

http://sourceware.org/ml/newlib/2007/msg00783.html

Is this a bug or is rand_r supposed to be unavailable with C99?

Cheers,
Nicholas Sherlock


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