https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109656
--- Comment #9 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #8)
> Could it be the call to __builtin_cpu_supports("darn") which happens in the
> std::random_device x("default") initialization in test01?!
>
> Could that system not support the DARN insn? Or have a faulty DARN?
You can check the AT_HWCAP2 value for whether your system has darn enabled or
not. I'll note darm was added in Power9, so __builtin_cpu_supports("darn")
should be false for Power8.
On my Power10 system, I see:
bergner@ltcden2-lp1:~$ LD_SHOW_AUXV=1 /bin/true | grep HWCAP2
AT_HWCAP2: mma arch_3_1 scv darn ieee128 arch_3_00 vcrypto tar isel
ebb dscr arch_2_07
(In reply to seurer from comment #5)
> BTW, I tried various changes in configure options, build compilers,
> binutils, and such in case something there was an issue but it always fails
> on just this one power 8 system. It works fine on another similar power 8
> and other power X (X!=8) systems.
Bill, which Power8 system is it that we're seeing this on?
Can you determine which test0*() function is the one having the issue?
