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Does clang++ do threadsafe initialisation of local static variables?
GCC does, unless you turn it off with the misleadingly named -fno-threadsafe-statics.
I’m using Apple clang version 2.0 (tags/Apple/clang-139) (based on LLVM 2.9svn).
Yes, same as with GCC (so can also be turned off with
-fno-threadsafe-statics)