[Bug bootstrap/50982] gthr reorganization breakage

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982

--- Comment #28 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-05 13:56:43 UTC ---
Just to be clear, as this bug report is quite misleading: once the initial
problem was fixed the change is that _GLIBCXX_HAS_GTHREADS is being set now
when it wasn't previously (for why that happens you'll need to look in the
libstdc++-v3/config.log)

That causes code to be included on AIX that was previously not used, the
failures in include/mutex are not new or caused by Rainer's changes, that code
was (apparently) never compiled on AIX previously. Everything from comment 7
onwards is due to the inclusion of code which has never been used on AIX
before.

Either the cause of the change to _GLIBCXX_HAS_GTHREADS should be reverted so
that AIX doesn't use the C++ mutex code, making the compilation errors in that
code disappear, or (I think this is the correct approach) the bug should be
recategorised as libstdc++ and assigned to me to fix the libstdc++ code so it
works on AIX.

The latter option should mean AIX will get a working C++11 threading
implementation, which presumably it previously didn't (which will mean we
should adjust the relevant parts of the testsuite to use any required flags to
run on AIX)