Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-fyZH37

Run Build Command(s):/usr/bin/make -f Makefile cmTC_3487c/fast && /usr/bin/make  -f CMakeFiles/cmTC_3487c.dir/build.make CMakeFiles/cmTC_3487c.dir/build
make[1]: Entering directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-fyZH37'
Building C object CMakeFiles/cmTC_3487c.dir/src.c.o
/usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD  -fPIE -o CMakeFiles/cmTC_3487c.dir/src.c.o -c /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-fyZH37/src.c
Linking C executable cmTC_3487c
/usr/local/lib/python3.9/dist-packages/cmake/data/bin/cmake -E cmake_link_script CMakeFiles/cmTC_3487c.dir/link.txt --verbose=1
/usr/bin/cc -rdynamic CMakeFiles/cmTC_3487c.dir/src.c.o -o cmTC_3487c 
/usr/bin/ld: CMakeFiles/cmTC_3487c.dir/src.c.o: in function `main':
src.c:(.text+0x46): undefined reference to `pthread_create'
/usr/bin/ld: src.c:(.text+0x52): undefined reference to `pthread_detach'
/usr/bin/ld: src.c:(.text+0x5e): undefined reference to `pthread_cancel'
/usr/bin/ld: src.c:(.text+0x6f): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_3487c.dir/build.make:99: cmTC_3487c] Error 1
make[1]: Leaving directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-fyZH37'
make: *** [Makefile:127: cmTC_3487c/fast] Error 2


Source file was:
#include <pthread.h>

static 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;
}


Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-cGgo6b

Run Build Command(s):/usr/bin/make -f Makefile cmTC_07a5d/fast && /usr/bin/make  -f CMakeFiles/cmTC_07a5d.dir/build.make CMakeFiles/cmTC_07a5d.dir/build
make[1]: Entering directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-cGgo6b'
Building C object CMakeFiles/cmTC_07a5d.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create -fPIE -o CMakeFiles/cmTC_07a5d.dir/CheckFunctionExists.c.o -c /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-cGgo6b/CheckFunctionExists.c
Linking C executable cmTC_07a5d
/usr/local/lib/python3.9/dist-packages/cmake/data/bin/cmake -E cmake_link_script CMakeFiles/cmTC_07a5d.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_07a5d.dir/CheckFunctionExists.c.o -o cmTC_07a5d  -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_07a5d.dir/build.make:99: cmTC_07a5d] Error 1
make[1]: Leaving directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-cGgo6b'
make: *** [Makefile:127: cmTC_07a5d/fast] Error 2



Determining if the function sgemm_ exists failed with the following output:
Change Dir: /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-HNyIO8

Run Build Command(s):/usr/bin/make -f Makefile cmTC_5f8c2/fast && /usr/bin/make  -f CMakeFiles/cmTC_5f8c2.dir/build.make CMakeFiles/cmTC_5f8c2.dir/build
make[1]: Entering directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-HNyIO8'
Building C object CMakeFiles/cmTC_5f8c2.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=sgemm_ -fPIE -o CMakeFiles/cmTC_5f8c2.dir/CheckFunctionExists.c.o -c /content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-HNyIO8/CheckFunctionExists.c
Linking C executable cmTC_5f8c2
/usr/local/lib/python3.9/dist-packages/cmake/data/bin/cmake -E cmake_link_script CMakeFiles/cmTC_5f8c2.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=sgemm_ -rdynamic CMakeFiles/cmTC_5f8c2.dir/CheckFunctionExists.c.o -o cmTC_5f8c2 
/usr/bin/ld: CMakeFiles/cmTC_5f8c2.dir/CheckFunctionExists.c.o: in function `main':
CheckFunctionExists.c:(.text+0x14): undefined reference to `sgemm_'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_5f8c2.dir/build.make:99: cmTC_5f8c2] Error 1
make[1]: Leaving directory '/content/colmap/build/CMakeFiles/CMakeScratch/TryCompile-HNyIO8'
make: *** [Makefile:127: cmTC_5f8c2/fast] Error 2