http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53270
John David Anglin <danglin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |UNCONFIRMED Ever Confirmed|1 |0 --- Comment #8 from John David Anglin <danglin at gcc dot gnu.org> 2012-05-08 15:20:06 UTC --- It appears to me that gcc61 is using the old linuxthreads implementation of pthreads. It may be necessary to use __GTHREAD_MUTEX_INIT_FUNCTION instead of __GTHREAD_MUTEX_INIT, etc, in ext/concurrence.h. This needs to be looked at by a c++ maintainer.