title: CMake: The C Compiler is not able to compile a simple test program
body: <p>I am trying to cross-compile the Azure IoT SDK C for a Mips processor. Cross-compiling an older version of the same SDK using an older version of CMake (2.8.12.2) works just fine, so I doubt it's the code itself. I am guessing it's the Mips GCC compiler. </p>
  
  <p>Error message:</p>
  
  <pre><code>CMake Error at /usr/share/cmake-3.10/Modules/CMakeTestCCompiler.cmake:52 (message):
    The C compiler
  
      "/usr/local/mipsisa32r2el/r23/bin/mipsisa32r2el-axis-linux-gnu-gcc"
  
    is not able to compile a simple test program.
  
    It fails with the following output:
  
      Change Dir: /home/axis/azure-iot-sdk-c/cmake/iotsdk_linux/CMakeFiles/CMakeTmp
  
      Run Build Command:"/usr/bin/make" "cmTC_2cc84/fast"
      /usr/bin/make -f CMakeFiles/cmTC_2cc84.dir/build.make CMakeFiles/cmTC_2cc84.dir/build
      make[1]: Entering directory '/home/axis/azure-iot-sdk-c/cmake/iotsdk_linux/CMakeFiles/CMakeTmp'
      Building C object CMakeFiles/cmTC_2cc84.dir/testCCompiler.c.o
      /usr/local/mipsisa32r2el/r23/bin/mipsisa32r2el-axis-linux-gnu-gcc --sysroot=/usr/local/mipsisa32r2el/r23    -o CMakeFiles/cmTC_2cc84.dir/testCCompiler.c.o   -c /home/axis/azure-iot-sdk-c/cmake/iotsdk_linux/CMakeFiles/CMakeTmp/testCCompiler.c
      Linking C executable cmTC_2cc84
      /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_2cc84.dir/link.txt --verbose=1
      /usr/local/mipsisa32r2el/r23/bin/mipsisa32r2el-axis-linux-gnu-gcc --sysroot=/usr/local/mipsisa32r2el/r23      -rdynamic CMakeFiles/cmTC_2cc84.dir/testCCompiler.c.o  -o cmTC_2cc84 
      /usr/local/mipsisa32r2el/r23/lib/gcc/mipsisa32r2el-axis-linux-gnu/4.7.2/../../../../mipsisa32r2el-axis-linux-gnu/bin/ld: this linker was not configured to use sysroots
      collect2: error: ld returned 1 exit status
      CMakeFiles/cmTC_2cc84.dir/build.make:97: recipe for target 'cmTC_2cc84' failed
      make[1]: *** [cmTC_2cc84] Error 1
      make[1]: Leaving directory '/home/axis/azure-iot-sdk-c/cmake/iotsdk_linux/CMakeFiles/CMakeTmp'
      Makefile:126: recipe for target 'cmTC_2cc84/fast' failed
      make: *** [cmTC_2cc84/fast] Error 2
  </code></pre>
  
  <p>Unfortunately, I am stuck with the Mips GCC compiler I have. Is there a way to disable this test-program check? </p>
  
  <p>Solution was to add these to the toolchain-file:</p>
  
  <pre><code>SET (CMAKE_C_COMPILER_WORKS 1)
  SET (CMAKE_CXX_COMPILER_WORKS 1)
  </code></pre>