[PATCH] Remove __PTHREAD_MUTEX_HAVE_ELISION undefined warning

[Roland McGrath]

> +#if !defined _PTHREAD_H

This is OK but there is no reason not to use #ifndef.

> +# error "Never include this file directly. Use <pthread.h> instead"

Two spaces between the sentences, and a period at the end of each.

(Those two also apply to the sysdeps variant files you're adding, of course.)

> +#define __PTHREAD_MUTEX_HAVE_ELISION 0

As Joseph also requested, add an explanatory comment describing the
protocol for this macro and how other sysdeps variant files might define
it.

> +#endif
> diff --git a/nptl/sysdeps/pthread/pthread.h b/nptl/sysdeps/pthread/pthread.h
> index 1e0c5dc..39d6b91 100644
> --- a/nptl/sysdeps/pthread/pthread.h
> +++ b/nptl/sysdeps/pthread/pthread.h
> @@ -26,6 +26,7 @@
>  #include <bits/pthreadtypes.h>
>  #include <bits/setjmp.h>
>  #include <bits/wordsize.h>
> +#include <bits/pthread-elision.h>

I'd put it right after bits/pthreadtypes.h.

> --- a/posix/Makefile
> +++ b/posix/Makefile
> @@ -29,7 +29,7 @@ headers	:= sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h	      \
>  	   bits/local_lim.h tar.h bits/utsname.h bits/confname.h	      \
>  	   bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h	      \
>  	   bits/sched.h re_comp.h wait.h bits/environments.h cpio.h	      \
> -	   sys/sysmacros.h spawn.h bits/unistd.h
> +	   sys/sysmacros.h spawn.h bits/unistd.h bits/pthread-elision.h

That belongs in nptl/Makefile.


Thanks,
Roland