Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/pilab/pyside-setup/build/qfpd-py3.9-qt6.2.4-32bit-debug/build/pyside-tools/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_b1a4e && [1/2] Building C object CMakeFiles/cmTC_b1a4e.dir/src.c.o
[2/2] Linking C executable cmTC_b1a4e
FAILED: cmTC_b1a4e 
: && /usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD  CMakeFiles/cmTC_b1a4e.dir/src.c.o -o cmTC_b1a4e   && :
/usr/bin/ld: CMakeFiles/cmTC_b1a4e.dir/src.c.o: in function `main':
src.c:(.text+0x40): undefined reference to `pthread_create'
/usr/bin/ld: src.c:(.text+0x4c): undefined reference to `pthread_detach'
/usr/bin/ld: src.c:(.text+0x58): undefined reference to `pthread_cancel'
/usr/bin/ld: src.c:(.text+0x68): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.


Source file was:
#include <pthread.h>

void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

Performing C++ SOURCE FILE Test HAVE_STDATOMIC failed with the following output:
Change Dir: /home/pilab/pyside-setup/build/qfpd-py3.9-qt6.2.4-32bit-debug/build/pyside-tools/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_e3d81 && [1/2] Building CXX object CMakeFiles/cmTC_e3d81.dir/src.cxx.o
[2/2] Linking CXX executable cmTC_e3d81
FAILED: cmTC_e3d81 
: && /usr/bin/c++ -DHAVE_STDATOMIC  CMakeFiles/cmTC_e3d81.dir/src.cxx.o -o cmTC_e3d81   && :
/usr/bin/ld: CMakeFiles/cmTC_e3d81.dir/src.cxx.o: in function `test(std::atomic<long long> volatile&)':
src.cxx:(.text+0x40): undefined reference to `__atomic_load_8'
/usr/bin/ld: src.cxx:(.text+0xbc): undefined reference to `__atomic_compare_exchange_8'
/usr/bin/ld: src.cxx:(.text+0x108): undefined reference to `__atomic_exchange_8'
/usr/bin/ld: src.cxx:(.text+0x160): undefined reference to `__atomic_store_8'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.


Source file was:
#include <atomic>
#include <cstdint>

void test(volatile std::atomic<std::int64_t> &a)
{
    std::int64_t v = a.load(std::memory_order_acquire);
    while (!a.compare_exchange_strong(v, v + 1,
                                      std::memory_order_acq_rel,
                                      std::memory_order_acquire)) {
        v = a.exchange(v - 1);
    }
    a.store(v + 1, std::memory_order_release);
}

int main(int, char **)
{
    void *ptr = (void*)0xffffffc0; // any random pointer
    test(*reinterpret_cast<std::atomic<std::int64_t> *>(ptr));
    return 0;
}