How to cross compile LLVM targeting arm on a laptop machine

Thank you for the answer. Have you tried this? I am trying to do what it says but I get what is shown below. What is the problem? Thanks

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-- The CXX compiler identification is Clang 3.5.0

-- Check for working CXX compiler using: Ninja

-- Check for working CXX compiler using: Ninja -- broken

CMake Error at /usr/share/cmake-2.8/Modules/CMakeTestCXXCompiler.cmake:54 (message):

  The C++ compiler "/usr/bin/clang++" is not able to compile a simple test

  program.

  It fails with the following output:

   Change Dir: /home/user/Desktop/llvm/llvm/new_build/CMakeFiles/CMakeTmp

  Run Build Command:/usr/bin/ninja cmTryCompileExec1541562247

  [1/2] Building CXX object

  CMakeFiles/cmTryCompileExec1541562247.dir/testCXXCompiler.cxx.o

  [2/2] Linking CXX executable cmTryCompileExec1541562247

  FAILED: : && /usr/bin/clang++ -target armv7a-linux-gnueabihf

  -mcpu=cortex-a9

  -I/usr/arm-linux-gnueabihf/include/c++/4.7.2/arm-linux-gnueabihf/

  -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name

  arm-linux-gnueabihf-gcc

  CMakeFiles/cmTryCompileExec1541562247.dir/testCXXCompiler.cxx.o -o

  cmTryCompileExec1541562247 -rdynamic && :

  /usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi

  Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om

  elf_k1om i386pep i386pe

  clang: error: linker command failed with exit code 1 (use -v to see

  invocation)

  ninja: build stopped: subcommand failed.

  CMake will not be able to correctly generate this project.

Call Stack (most recent call first):

  CMakeLists.txt:19 (project)

-- Configuring incomplete, errors occurred!