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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98862] Complex reduction support in offload region
Date: Thu, 28 Jan 2021 14:18:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98862

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> libstdc++-v3 isn't supported ATM on either nvptx* or amdgcn* offloading, =
so
> if one needs anything from libstdc++, it will not work.

I can confirm that it does not work with '-O0', showing that the
symbol
   _ZNSt7complexIfEC1Eff
alias
   std::complex<float>::complex(float, float)
is missing.

But:

> As for the 16 byte atomics, I thought this was meant to be solved through
> -latomic, but I might misremember.

Yes,
  $ g++ -fopenmp -O2 complex_reduction.cpp -foffload=3D-latomic
works =E2=80=93 both compiling and running (on nvptx).

Note the added '-foffload=3D-latomic' (and -O2).
See also: https://gcc.gnu.org/wiki/Offloading#Compilation_options=