Missing functions for linux perf

Missing functions for linux perf

[Laurent Bercot]

  Hi,
  I'm trying to compile Linux's "perf" tool with musl. Barring
a few truckloads of warnings regarding redefined symbols in
kernel headers, I managed to get the core source files compiled,
but there are errors at link time - the following functions are
undefined:

  pthread_attr_setaffinity_np
  sched_getcpu

  Sure, those are glibc extensions, but would it be possible to
have them in musl, or is there a good reason not to ?

  Thanks,

-- 
  Laurent

Re: Missing functions for linux perf

[Rich Felker]

On Fri, May 08, 2015 at 09:42:18PM +0200, Laurent Bercot wrote:
> 
>  Hi,
>  I'm trying to compile Linux's "perf" tool with musl. Barring
> a few truckloads of warnings regarding redefined symbols in
> kernel headers, I managed to get the core source files compiled,
> but there are errors at link time - the following functions are
> undefined:
> 
>  pthread_attr_setaffinity_np
>  sched_getcpu
> 
>  Sure, those are glibc extensions, but would it be possible to
> have them in musl, or is there a good reason not to ?

For pthread_attr_setaffinity_np, I'd rather not since it requires
having allocated state in pthread_attr_t objects, which requires
auditing any place they're copied by value, and other headaches. The
same thing can be achieved by pthread_setattr_np after the thread
starts, so putting the affinity in the attr object just seems
gratuitously hideous.

I have no fundamental objection to sched_getcpu.

Rich