https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119535

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Sam James from comment #2)
> (In reply to Andrew Pinski from comment #1)
> 
> Ah, I thought you always had to do -fprofile-update=atomic for that.

gcc.cc has the following for the default cc1 options spec:
%{pthread:-fprofile-update=prefer-atomic}

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