> On March 18, 2020 at 7:53 PM Iain Sandoe <idsandoe@xxxxxxxxxxxxxx> wrote: > > Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > > > > I would expect the default to be correct for the target i.e.--disable-tls. If enabling it worked correctly, it would be the default. > > That makes no sense, neither std::mutex nor std::unique_lock uses TLS. > > Darwin uses emulated TLS on all versions (powerpc, i686, x86_64) the correct default (to use emulatedTLS) is selected without requiring any additional configure options. Selecting --enable-tls will undoubtedly produce an invalid configuration. > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52268 is an enhancement PR to add native TLS for 10.7+ (but that would still not work on earlier versions, of course). Thank you both for the quick responses! Knowing that lack of --enable-tls is normal on Mac set me in the right direction. The synchronization problem was due to an equally bad assumption. All working as expected now. Thanks again!
