[CMake] CMake fails to use a toolchain to cross-compile

[Eduardo Sánchez Muñoz]

I get the following error when I use a toolchain file to cross-compile with
mingw32:
$ cmake -DCMAKE_TOOLCHAIN_FILE=~/Documentos/mingw32.cmake
-DCMAKE_INSTALL_PREFIX=/usr/i486-mingw32 .
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
CMake Error: your RC compiler: "CMAKE_RC_COMPILER-NOTFOUND" was not found.
Please set CMAKE_RC_COMPILER to a valid compiler path or name.
-- Check for working C compiler: /usr/bin/i486-mingw32-gcc
CMake Error at /usr/share/cmake-2.8/Modules/CMakeRCInformation.cmake:22
(GET_FILENAME_COMPONENT):
  get_filename_component called with incorrect number of arguments
Call Stack (most recent call first):
  /usr/share/cmake-2.8/Modules/Platform/Windows-GNU.cmake:59
(enable_language)
  /usr/share/cmake-2.8/Modules/Platform/Windows-GNU-C.cmake:1 (include)
  /usr/share/cmake-2.8/Modules/CMakeCInformation.cmake:56 (INCLUDE)
  CMakeLists.txt:2 (PROJECT)


CMake Error: CMAKE_RC_COMPILER not set, after EnableLanguage
CMake Error: Internal CMake error, TryCompile configure of cmake failed
-- Check for working C compiler: /usr/bin/i486-mingw32-gcc -- broken
CMake Error at /usr/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52
(MESSAGE):
  The C compiler "/usr/bin/i486-mingw32-gcc" is not able to compile a simple
  test program.

  It fails with the following output:





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:3 (PROJECT)


-- Configuring incomplete, errors occurred!

My toolchain file is:
set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_C_COMPILER i486-mingw32-gcc)
set(CMAKE_CXX_COMPILER i486-mingw32-g++)
set(CMAKE_FIND_ROOT_PATH /usr/i486-mingw32)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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