[Bug c++/52680] std::this_thread::sleep_for #ifdef'd out by _GLIBCXX_USE_NANOSLEEP

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52680

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-03-31
     Ever Confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-31 15:19:38 UTC ---
ok, great :)  As I said, we do need to revisit the configure-time checks which
determine whether to use nanonsleep and sched_yield. Doing so is on my TODO
list so I'm going to confirm this PR but as an enhancement rather than a bug.

For the benefit of the other maintainers: in some off-list discussion with
Rainer I suggested that we might want to use --enable-libstdcxx-time by default
on Solaris because sched_yield is defined in libposix4 and doesn't depend on
libpthread.  Additionally, we should note that librt(3LIB) on Solaris says:
"The name libposix4 is maintained for backward compatibility and should be
avoided. librt is the preferred name for this library."