Determining if the pthread_create exist failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_58f34/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_58f34.dir/build.make CMakeFiles/cmTC_58f34.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_58f34.dir/CheckSymbolExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_58f34.dir/CheckSymbolExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:11: error: ISO C forbids conversion of function pointer to object pointer type [-Wpedantic]
   return ((int*)(&pthread_create))[argc];
           ^
make[2]: *** [CMakeFiles/cmTC_58f34.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_58f34/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'

File /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if compiler accepts -pthread returned OFF instead of 2. The compiler had the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ea641/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_ea641.dir/build.make CMakeFiles/cmTC_ea641.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_ea641.dir/CheckForPthreads.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_ea641.dir/CheckForPthreads.c.o   -c /home/buildroot/buildroot-test/instance-1/output/host/share/cmake-3.8/Modules/CheckForPthreads.c
Linking C executable cmTC_ea641
/home/buildroot/buildroot-test/instance-1/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_ea641.dir/link.txt --verbose=1
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG    -rdynamic CMakeFiles/cmTC_ea641.dir/CheckForPthreads.c.o  -o cmTC_ea641 -pthread 
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the include file util.h exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_31d7a/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_31d7a.dir/build.make CMakeFiles/cmTC_31d7a.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_31d7a.dir/CheckIncludeFile.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_31d7a.dir/CheckIncludeFile.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: util.h: No such file or directory
 #include <util.h>
          ^~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_31d7a.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_31d7a/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the include file libutil.h exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_3218b/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_3218b.dir/build.make CMakeFiles/cmTC_3218b.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_3218b.dir/CheckIncludeFile.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_3218b.dir/CheckIncludeFile.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: libutil.h: No such file or directory
 #include <libutil.h>
          ^~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_3218b.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_3218b/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the include file sys/utime.h exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_49c83/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_49c83.dir/build.make CMakeFiles/cmTC_49c83.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_49c83.dir/CheckIncludeFile.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_49c83.dir/CheckIncludeFile.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: sys/utime.h: No such file or directory
 #include <sys/utime.h>
          ^~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_49c83.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_49c83/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the function explicit_bzero exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_55fe3/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_55fe3.dir/build.make CMakeFiles/cmTC_55fe3.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_55fe3.dir/CheckFunctionExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=explicit_bzero  -DNDEBUG   -o CMakeFiles/cmTC_55fe3.dir/CheckFunctionExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_55fe3
/home/buildroot/buildroot-test/instance-1/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_55fe3.dir/link.txt --verbose=1
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=explicit_bzero  -DNDEBUG    -rdynamic CMakeFiles/cmTC_55fe3.dir/CheckFunctionExists.c.o  -o cmTC_55fe3 
CMakeFiles/cmTC_55fe3.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text.startup+0xc): undefined reference to `explicit_bzero'
collect2: error: ld returned 1 exit status
make[2]: *** [cmTC_55fe3] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_55fe3/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the function memset_s exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_adf9a/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_adf9a.dir/build.make CMakeFiles/cmTC_adf9a.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_adf9a.dir/CheckFunctionExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=memset_s  -DNDEBUG   -o CMakeFiles/cmTC_adf9a.dir/CheckFunctionExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_adf9a
/home/buildroot/buildroot-test/instance-1/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_adf9a.dir/link.txt --verbose=1
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=memset_s  -DNDEBUG    -rdynamic CMakeFiles/cmTC_adf9a.dir/CheckFunctionExists.c.o  -o cmTC_adf9a 
CMakeFiles/cmTC_adf9a.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text.startup+0xc): undefined reference to `memset_s'
collect2: error: ld returned 1 exit status
make[2]: *** [cmTC_adf9a] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_adf9a/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Determining if the ntohll exist failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_9e3ba/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_9e3ba.dir/build.make CMakeFiles/cmTC_9e3ba.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_9e3ba.dir/CheckSymbolExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_9e3ba.dir/CheckSymbolExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'ntohll' undeclared (first use in this function); did you mean 'ntohl'?
   return ((int*)(&ntohll))[argc];
                   ^~~~~~
                   ntohl
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:4:14: warning: parameter 'argc' set but not used [-Wunused-but-set-parameter]
 int main(int argc, char** argv)
              ^~~~
make[2]: *** [CMakeFiles/cmTC_9e3ba.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_9e3ba/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'

File /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <arpa/inet.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef ntohll
  return ((int*)(&ntohll))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the htonll exist failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_91f1d/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_91f1d.dir/build.make CMakeFiles/cmTC_91f1d.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_91f1d.dir/CheckSymbolExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC   -DNDEBUG   -o CMakeFiles/cmTC_91f1d.dir/CheckSymbolExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'htonll' undeclared (first use in this function); did you mean 'htonl'?
   return ((int*)(&htonll))[argc];
                   ^~~~~~
                   htonl
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:4:14: warning: parameter 'argc' set but not used [-Wunused-but-set-parameter]
 int main(int argc, char** argv)
              ^~~~
make[2]: *** [CMakeFiles/cmTC_91f1d.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_91f1d/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'

File /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <arpa/inet.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef htonll
  return ((int*)(&htonll))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the function __strtoull exists failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_4e4b6/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_4e4b6.dir/build.make CMakeFiles/cmTC_4e4b6.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4e4b6.dir/CheckFunctionExists.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=__strtoull  -DNDEBUG   -o CMakeFiles/cmTC_4e4b6.dir/CheckFunctionExists.c.o   -c /home/buildroot/buildroot-test/instance-1/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_4e4b6
/home/buildroot/buildroot-test/instance-1/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4e4b6.dir/link.txt --verbose=1
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DCHECK_FUNCTION_EXISTS=__strtoull  -DNDEBUG    -rdynamic CMakeFiles/cmTC_4e4b6.dir/CheckFunctionExists.c.o  -o cmTC_4e4b6 
CMakeFiles/cmTC_4e4b6.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text.startup+0xc): undefined reference to `__strtoull'
collect2: error: ld returned 1 exit status
make[2]: *** [cmTC_4e4b6] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_4e4b6/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'


Performing C SOURCE FILE Test HAVE_MSC_THREAD_LOCAL_STORAGE failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_26366/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_26366.dir/build.make CMakeFiles/cmTC_26366.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_26366.dir/src.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DHAVE_MSC_THREAD_LOCAL_STORAGE  -DNDEBUG   -o CMakeFiles/cmTC_26366.dir/src.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:1: error: return type defaults to 'int' [-Wimplicit-int]
 __declspec(thread) int tls;
 ^~~~~~~~~~
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:1: warning: no previous prototype for '__declspec' [-Wmissing-prototypes]
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c: In function '__declspec':
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:4:16: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 int main(void) {
                ^
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:1: error: type of 'thread' defaults to 'int' [-Wimplicit-int]
 __declspec(thread) int tls;
 ^~~~~~~~~~
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:24: error: declaration for parameter 'tls' but no such parameter
 __declspec(thread) int tls;
                        ^~~
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:6:1: error: expected '{' at end of input
 }
 ^
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:1: warning: unused parameter 'thread' [-Wunused-parameter]
 __declspec(thread) int tls;
 ^~~~~~~~~~
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:2:24: warning: unused parameter 'tls' [-Wunused-parameter]
 __declspec(thread) int tls;
                        ^~~
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:6:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
make[2]: *** [CMakeFiles/cmTC_26366.dir/src.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_26366/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'

Source file was:

__declspec(thread) int tls;

int main(void) {
    return 0;
}
Performing C SOURCE FILE Test HAVE_COMPILER__FUNCTION__ failed with the following output:
Change Dir: /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_2bf2e/fast"
make[1]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_2bf2e.dir/build.make CMakeFiles/cmTC_2bf2e.dir/build
make[2]: Entering directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_2bf2e.dir/src.c.o
/home/buildroot/buildroot-test/instance-1/output/host/bin/arm-buildroot-linux-musleabihf-gcc --sysroot=/home/buildroot/buildroot-test/instance-1/output/host/arm-buildroot-linux-musleabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -std=gnu99 -pedantic -pedantic-errors -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fPIC -DHAVE_COMPILER__FUNCTION__ -Werror  -DNDEBUG   -o CMakeFiles/cmTC_2bf2e.dir/src.c.o   -c /home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c: In function 'main':
/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp/src.c:4:18: error: ISO C does not support '__FUNCTION__' predefined identifier [-Wpedantic]
     printf("%s", __FUNCTION__);
                  ^~~~~~~~~~~~
make[2]: *** [CMakeFiles/cmTC_2bf2e.dir/src.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_2bf2e/fast] Error 2
make[1]: Leaving directory `/home/buildroot/buildroot-test/instance-1/output/build/libssh-0.8.1/buildroot-build/CMakeFiles/CMakeTmp'

Source file was:

#include <stdio.h>
int main(void) {
    printf("%s", __FUNCTION__);
    return 0;
}