Determining if the __x86_64__ exist failed with the following output:
Change Dir: /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_f2ca5/fast"
make[1]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_f2ca5.dir/build.make CMakeFiles/cmTC_f2ca5.dir/build
make[2]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_f2ca5.dir/CheckSymbolExists.c.o
/home/buildroot/build/instance-0/output/host/bin/arc-buildroot-linux-gnu-gcc --sysroot=/home/buildroot/build/instance-0/output/host/arc-buildroot-linux-gnu/sysroot   -D_POSIX_C_SOURCE=200112L -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -matomic -O2 -Werror -Werror   -DNDEBUG -fPIE   -o CMakeFiles/cmTC_f2ca5.dir/CheckSymbolExists.c.o   -c /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: error: '__x86_64__' undeclared (first use in this function)
   return ((int*)(&__x86_64__))[argc];
                   ^~~~~~~~~~
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: note: each undeclared identifier is reported only once for each function it appears in
CMakeFiles/cmTC_f2ca5.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_f2ca5.dir/CheckSymbolExists.c.o' failed
make[2]: *** [CMakeFiles/cmTC_f2ca5.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_f2ca5/fast' failed
make[1]: *** [cmTC_f2ca5/fast] Error 2
make[1]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'

File /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */

int main(int argc, char** argv)
{
  (void)argv;
#ifndef __x86_64__
  return ((int*)(&__x86_64__))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the __i386__ exist failed with the following output:
Change Dir: /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_d0916/fast"
make[1]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_d0916.dir/build.make CMakeFiles/cmTC_d0916.dir/build
make[2]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d0916.dir/CheckSymbolExists.c.o
/home/buildroot/build/instance-0/output/host/bin/arc-buildroot-linux-gnu-gcc --sysroot=/home/buildroot/build/instance-0/output/host/arc-buildroot-linux-gnu/sysroot   -D_POSIX_C_SOURCE=200112L -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -matomic -O2 -Werror -Werror   -DNDEBUG -fPIE   -o CMakeFiles/cmTC_d0916.dir/CheckSymbolExists.c.o   -c /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: error: '__i386__' undeclared (first use in this function); did you mean '__DATE__'?
   return ((int*)(&__i386__))[argc];
                   ^~~~~~~~
                   __DATE__
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: note: each undeclared identifier is reported only once for each function it appears in
CMakeFiles/cmTC_d0916.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_d0916.dir/CheckSymbolExists.c.o' failed
make[2]: *** [CMakeFiles/cmTC_d0916.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_d0916/fast' failed
make[1]: *** [cmTC_d0916/fast] Error 2
make[1]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'

File /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */

int main(int argc, char** argv)
{
  (void)argv;
#ifndef __i386__
  return ((int*)(&__i386__))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the __arm__ exist failed with the following output:
Change Dir: /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ead6e/fast"
make[1]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_ead6e.dir/build.make CMakeFiles/cmTC_ead6e.dir/build
make[2]: Entering directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_ead6e.dir/CheckSymbolExists.c.o
/home/buildroot/build/instance-0/output/host/bin/arc-buildroot-linux-gnu-gcc --sysroot=/home/buildroot/build/instance-0/output/host/arc-buildroot-linux-gnu/sysroot   -D_POSIX_C_SOURCE=200112L -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -matomic -O2 -Werror -Werror   -DNDEBUG -fPIE   -o CMakeFiles/cmTC_ead6e.dir/CheckSymbolExists.c.o   -c /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: error: '__arm__' undeclared (first use in this function); did you mean '__DATE__'?
   return ((int*)(&__arm__))[argc];
                   ^~~~~~~
                   __DATE__
/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:7:19: note: each undeclared identifier is reported only once for each function it appears in
CMakeFiles/cmTC_ead6e.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_ead6e.dir/CheckSymbolExists.c.o' failed
make[2]: *** [CMakeFiles/cmTC_ead6e.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_ead6e/fast' failed
make[1]: *** [cmTC_ead6e/fast] Error 2
make[1]: Leaving directory '/home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp'

File /home/buildroot/build/instance-0/output/build/azure-iot-sdk-c-2018-03-16/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */

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