As has already been reported a few times, 2.9.0 won't build on any version of
OS X. The problem line is always this:
> threads.c:918: error: expected expression before '{' token
The line in question is:
> once_control = PTHREAD_ONCE_INIT;
This happens to work on linux, but it's not legal. As the name and the manpage
example code imply, and the POSIX documentation makes clear, PTHREAD_ONCE_INIT
can only be used in initializations, not assignments. This is because some
platforms defined PTHREAD_ONCE_INIT as an aggregate initializer.
Linux is not such a platform, but Darwin is. From the 10.8.1 version of
pthread.h:
> #define PTHREAD_ONCE_INIT {_PTHREAD_ONCE_SIG_init, {0}}
Also, if I understand what the code is trying to accomplish (to allow the
pthread_once to get called again after you've done this), it's really sketchy
and probably shouldn't work reliably even on platforms where it compiles.
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