title: Cmake toolchain for 32-bit MIPS processor
body: <p>Need to run an Azure IoT SDK C sample on an Axis camera. Using the standard cmake to build the samples does not work, as they are compiled for 64-bit x86_84. Need it to be compiled to MIPS32.</p>
  
  <p>Eugene Sh. suggested making a toolchain file for it. I've written one now, but it fails at 16% with the following error: </p>
  
  <pre><code>[ 16%] /usr/bin/cmake: /usr/local/lib/libcurl.so.4: no version information available (required by /usr/bin/cmake)
  Building C object c-utility/CMakeFiles/aziotsharedutil.dir/adapters/uniqueid_linux.c.o
  /demo/azure-iot-sdk-c/c-utility/adapters/uniqueid_linux.c:7:23: fatal error: uuid/uuid.h: No such file or directory
  compilation terminated.
  make[2]: *** [c-utility/CMakeFiles/aziotsharedutil.dir/adapters/uniqueid_linux.c.o] Error 1
  make[1]: *** [c-utility/CMakeFiles/aziotsharedutil.dir/all] Error 2
  make: *** [all] Error 2
  </code></pre>
  
  <p>My toolchain file:</p>
  
  <pre><code>INCLUDE(CMakeForceCompiler)
  
  SET(CMAKE_SYSTEM_NAME Linux)     # this one is important
  SET(CMAKE_SYSTEM_VERSION 1)      # this one not so much
  SET(CMAKE_SYSTEM_PROCESSOR mips)
  
  # this is the location of the imps toolchain targeting the M1125
  SET(CMAKE_C_COMPILER /usr/local/mipsisa32r2el/r23/bin/mipsisa32r2el-axis-linux-gnu-gcc)
  
  # this is the file system root of the target
  #SET(CMAKE_FIND_ROOT_PATH /usr/local/mipsisa32r2el/r23)
  
  # search for programs in the build host directories
  SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
  
  # for libraries and headers in the target directories
  SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
  SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
  SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
  </code></pre>
  
  <p>And run it using ´./build.sh --toolchain-file toolchain-mips.cmake`. </p>
  
  <p>If I run it as the <a href="https://github.com/Azure/azure-iot-sdk-c/blob/master/doc/SDK_cross_compile_example.md" rel="nofollow noreferrer">documentation</a> says, using -cl --sysroot=/usr/local/mipsisa32r2el/r23. I get errors that it cannot find OpenSSL and fails much earlier. </p>