Performing C++ SOURCE FILE Test LLVM_HAS_ATOMICS failed with the following output:
Change Dir: /home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_4b66b/fast"
make[1]: Entering directory '/home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_4b66b.dir/build.make CMakeFiles/cmTC_4b66b.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_4b66b.dir/src.cxx.o
/home/buildroot/autobuild/instance-0/output/host/bin/sparc-linux-g++ --sysroot=/home/buildroot/autobuild/instance-0/output/host/sparc-buildroot-linux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -Wall -Wextra -Winvalid-pch -Wno-unused-parameter -std=c++11 -pipe -fPIC -DLLVM_HAS_ATOMICS  -DNDEBUG   -o CMakeFiles/cmTC_4b66b.dir/src.cxx.o -c /home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp/src.cxx
Linking CXX executable cmTC_4b66b
/home/buildroot/autobuild/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4b66b.dir/link.txt --verbose=1
/home/buildroot/autobuild/instance-0/output/host/bin/sparc-linux-g++ --sysroot=/home/buildroot/autobuild/instance-0/output/host/sparc-buildroot-linux-uclibc/sysroot  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -Wall -Wextra -Winvalid-pch -Wno-unused-parameter -std=c++11 -pipe -fPIC -DLLVM_HAS_ATOMICS  -DNDEBUG    -rdynamic CMakeFiles/cmTC_4b66b.dir/src.cxx.o  -o cmTC_4b66b 
CMakeFiles/cmTC_4b66b.dir/src.cxx.o: In function `main':
src.cxx:(.text.startup+0x20): undefined reference to `__sync_val_compare_and_swap_4'
src.cxx:(.text.startup+0x2c): undefined reference to `__sync_add_and_fetch_4'
src.cxx:(.text.startup+0x38): undefined reference to `__sync_sub_and_fetch_4'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_4b66b.dir/build.make:97: recipe for target 'cmTC_4b66b' failed
make[2]: *** [cmTC_4b66b] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_4b66b/fast' failed
make[1]: *** [cmTC_4b66b/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/instance-0/output/build/i2pd-2.22.0/build/CMakeFiles/CMakeTmp'

Source file was:

#ifdef _MSC_VER
#include <Intrin.h> /* Workaround for PR19898. */
#include <windows.h>
#endif
int main() {
#ifdef _MSC_VER
        volatile LONG val = 1;
        MemoryBarrier();
        InterlockedCompareExchange(&val, 0, 1);
        InterlockedIncrement(&val);
        InterlockedDecrement(&val);
#else
        volatile unsigned long val = 1;
        __sync_synchronize();
        __sync_val_compare_and_swap(&val, 1, 0);
        __sync_add_and_fetch(&val, 1);
        __sync_sub_and_fetch(&val, 1);
#endif
        return 0;
      }