[Bug 238650] pthread_getthreadid_np lacks libc stub

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238650

            Bug ID: 238650
           Summary: pthread_getthreadid_np lacks libc stub
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: threads
          Assignee: [email protected]
          Reporter: [email protected]

A consumer may want to avoid -lpthread dependency if thread ID is not critical
e.g., only used for tracing/debugging.

Example:
https://github.com/freebsd/freebsd-ports/blob/d1e16f7b264b/multimedia/libva/files/patch-va_va__trace.c

Environment:
  $ cat a.c
  #include <stdio.h>
  #include <pthread_np.h>

  int main()
  {
          printf("%d\n", pthread_getthreadid_np());
          return 0;
  }

FreeBSD:

  $ cc a.c
  ld: error: undefined symbol: pthread_getthreadid_np
  >>> referenced by a.c
  >>>               /tmp/a-104ade.o:(main)
  cc: error: linker command failed with exit code 1 (use -v to see invocation)

  $ cc a.c -pthread
  $ ./a.out
  101610

DragonFly:

  $ cc a.c
  $ ./a.out
  0

  $ cc a.c -pthread
  $ ./a.out
  1

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