[Bug target/94087] std::random_device often fails when used from multiple threads

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087

--- Comment #15 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jonathan Wakely from comment #13)
> We could do this easily enough (which could be simplified if RDRAND is
> guaranteed to be available when RDSEED is available):
> 

All Intel processors with RDSEED supports RDRAND which requires checking
of the CF bit in EFLAGS.