Performing C++ SOURCE FILE Test HAVE_CXX_ATOMICS64_WITHOUT_LIB failed with the following output:
Change Dir: /home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_1a4f7/fast && make[1]: Entering directory '/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_1a4f7.dir/build.make CMakeFiles/cmTC_1a4f7.dir/build
make[2]: Entering directory '/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_1a4f7.dir/src.cxx.o
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/nios2-linux-g++ --sysroot=/home/giuliobenetti/autobuild/run/instance-3/output-1/host/nios2-buildroot-linux-gnu/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Wall -Wconversion -pedantic -Wextra -Wno-missing-field-initializers -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11   -o CMakeFiles/cmTC_1a4f7.dir/src.cxx.o -c /home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp/src.cxx
/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp/src.cxx: In function 'int main()':
/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp/src.cxx:6:12: warning: unused variable 'i' [-Wunused-variable]
    6 |   uint64_t i = x.load(std::memory_order_relaxed);
      |            ^
Linking CXX executable cmTC_1a4f7
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_1a4f7.dir/link.txt --verbose=1
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/nios2-linux-g++ --sysroot=/home/giuliobenetti/autobuild/run/instance-3/output-1/host/nios2-buildroot-linux-gnu/sysroot  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Wall -Wconversion -pedantic -Wextra -Wno-missing-field-initializers -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11    CMakeFiles/cmTC_1a4f7.dir/src.cxx.o  -o cmTC_1a4f7 
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/nios2-buildroot-linux-gnu/10.3.0/../../../../nios2-buildroot-linux-gnu/bin/ld: CMakeFiles/cmTC_1a4f7.dir/src.cxx.o: in function `main':
src.cxx:(.text.startup+0x10): undefined reference to `__atomic_load_8'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_1a4f7.dir/build.make:90: cmTC_1a4f7] Error 1
make[2]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:124: cmTC_1a4f7/fast] Error 2
make[1]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/CMakeFiles/CMakeTmp'


Source file was:

#include <atomic>
#include <cstdint>
std::atomic<uint64_t> x (0);
int main() {
  uint64_t i = x.load(std::memory_order_relaxed);
  return 0;
}