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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: Re: r273918 buildworld broke at semaphore
Date: Tue, 11 Nov 2014 13:33:05 -0500
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Cc: Beeblebrox <zaphod@berentweb.com>
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On Friday, October 31, 2014 4:08:06 pm Beeblebrox wrote:
> First breakage in a long time. Error is:
> 
> In file included from cancelpoints_sem_new.c:47:
> /usr/src/lib/libc/../../include/semaphore.h:41:16: error: field has
> incomplete type 'struct _usem2'
>         struct _usem2   _kern;
>                         ^
> /usr/src/lib/libc/../../include/semaphore.h:41:9: note: forward declaration
> of 'struct _usem2'
>         struct _usem2   _kern;
>                ^
> cancelpoints_sem_new.c:66:33: error: use of undeclared identifier
> 'USEM_MAX_COUNT'
> _Static_assert(SEM_VALUE_MAX <= USEM_MAX_COUNT, "SEM_VALUE_MAX too large");
>                                 ^
> cancelpoints_sem_new.c:335:15: warning: implicit declaration of function
> 'USEM_COUNT' is invalid in C99 [-Wimplicit-function-declaration]
>         *sval = (int)USEM_COUNT(sem->_kern._count);
>                      ^
> cancelpoints_sem_new.c:342:23: error: use of undeclared identifier
> 'UMTX_OP_SEM2_WAKE'
>         return _umtx_op(sem, UMTX_OP_SEM2_WAKE, 0, NULL, NULL);
>                              ^
> cancelpoints_sem_new.c:361:23: error: use of undeclared identifier
> 'UMTX_OP_SEM2_WAIT'
>         return _umtx_op(sem, UMTX_OP_SEM2_WAIT, 0,
>                              ^
> cancelpoints_sem_new.c:445:14: error: use of undeclared identifier
> 'USEM_HAS_WAITERS'
>         if (count & USEM_HAS_WAITERS)
>                     ^
> 1 warning and 5 errors generated.

Seems like your tree is not fully up to date?  The changes to sem_new.c were 
committed in the same commit as the changes to sys/umtx.h.

-- 
John Baldwin