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std::promise and std::future use std::call_once under the hood, which requires
the tls-model to be at least initial_exec, excluding local_exec.
Furthermore, gcc has a bug regarding exceptions in std::call_once that
is best avoided. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146
for more info.
Signed-off-by: Michael de Lang <kingoipo@gmail.com>