Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_649da/fast && make[1]: Entering directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_649da.dir/build.make CMakeFiles/cmTC_649da.dir/build
make[2]: Entering directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_649da.dir/src.c.o
/home/thomas/autobuild/instance-3/output-1/host/bin/mips-img-linux-gnu-gcc --sysroot=/home/thomas/autobuild/instance-3/output-1/host/mips64el-buildroot-linux-gnu/sysroot -DCMAKE_HAVE_LIBC_PTHREAD  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -D_FORTIFY_SOURCE=2  -o CMakeFiles/cmTC_649da.dir/src.c.o -c /home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_649da
/home/thomas/autobuild/instance-3/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_649da.dir/link.txt --verbose=1
/home/thomas/autobuild/instance-3/output-1/host/bin/mips-img-linux-gnu-gcc --sysroot=/home/thomas/autobuild/instance-3/output-1/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -D_FORTIFY_SOURCE=2  CMakeFiles/cmTC_649da.dir/src.c.o -o cmTC_649da 
CMakeFiles/cmTC_649da.dir/src.c.o: In function `main':
src.c:(.text.startup+0x28): undefined reference to `pthread_create'
src.c:(.text.startup+0x2c): undefined reference to `pthread_create'
src.c:(.text.startup+0x34): undefined reference to `pthread_detach'
src.c:(.text.startup+0x38): undefined reference to `pthread_detach'
src.c:(.text.startup+0x40): undefined reference to `pthread_cancel'
src.c:(.text.startup+0x44): undefined reference to `pthread_cancel'
src.c:(.text.startup+0x50): undefined reference to `pthread_join'
src.c:(.text.startup+0x54): undefined reference to `pthread_join'
src.c:(.text.startup+0x5c): undefined reference to `pthread_atfork'
src.c:(.text.startup+0x68): undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_649da.dir/build.make:99: cmTC_649da] Error 1
make[2]: Leaving directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:127: cmTC_649da/fast] Error 2
make[1]: Leaving directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'


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: /home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_6dcde/fast && make[1]: Entering directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_6dcde.dir/build.make CMakeFiles/cmTC_6dcde.dir/build
make[2]: Entering directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_6dcde.dir/CheckFunctionExists.c.o
/home/thomas/autobuild/instance-3/output-1/host/bin/mips-img-linux-gnu-gcc --sysroot=/home/thomas/autobuild/instance-3/output-1/host/mips64el-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_6dcde.dir/CheckFunctionExists.c.o -c /home/thomas/autobuild/instance-3/output-1/host/share/cmake-3.22/Modules/CheckFunctionExists.c
Linking C executable cmTC_6dcde
/home/thomas/autobuild/instance-3/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_6dcde.dir/link.txt --verbose=1
/home/thomas/autobuild/instance-3/output-1/host/bin/mips-img-linux-gnu-gcc --sysroot=/home/thomas/autobuild/instance-3/output-1/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create CMakeFiles/cmTC_6dcde.dir/CheckFunctionExists.c.o -o cmTC_6dcde  -lpthreads 
/home/thomas/autobuild/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/mips-img-linux-gnu/6.3.0/../../../../mips-img-linux-gnu/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_6dcde.dir/build.make:99: cmTC_6dcde] Error 1
make[2]: Leaving directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:127: cmTC_6dcde/fast] Error 2
make[1]: Leaving directory '/home/thomas/autobuild/instance-3/output-1/build/flare-engine-1.14/CMakeFiles/CMakeTmp'