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mipsel-linux-musl #12

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@andrewrk

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@andrewrk
/home/andy/dev/bootstrap-zig/out/host/bin/zig  c++ -target mipsel-linux-musl   -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11  -Werror=unguarded-availability-new   -static  CMakeFiles/cmTC_52428.dir/src.cxx.o  -o cmTC_52428  -lm
#include <atomic>
#include <cstdint>
std::atomic<uint64_t> x (0);
int main() {
  uint64_t i = x.load(std::memory_order_relaxed);
  return 0;
}
lld: error: undefined symbol: __atomic_load_8
>>> referenced by src.cxx
>>>               CMakeFiles/cmTC_52428.dir/src.cxx.o:(unsigned long long std::__1::__cxx_atomic_load<unsigned long long>(std::__1::__cxx_atomic_base_impl<unsigned long long> const*, std::__1::memory_order))
>>> referenced by src.cxx
>>>               CMakeFiles/cmTC_52428.dir/src.cxx.o:(unsigned long long std::__1::__cxx_atomic_load<unsigned long long>(std::__1::__cxx_atomic_base_impl<unsigned long long> const*, std::__1::memory_order))

Looks like a missing compiler-rt function.

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