Squashed 'cmake/' content from commit 07b56b6

git-subtree-dir: cmake
git-subtree-split: 07b56b6a3dbe9f0c15160b3d11f11702db5e3999

Toolchains/Toolchain-mingw64.cmake

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+# the name of the target operating system
+SET(CMAKE_SYSTEM_NAME Windows)
+
+# which compilers to use for C and C++
+SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc-posix)
+SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++-posix)
+
+# here is the target environment located
+SET(CMAKE_FIND_ROOT_PATH /usr/x86_64-w64-mingw32)
+
+# adjust the default behaviour of the FIND_XXX() commands:
+# search headers and libraries in the target environment, search
+# programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+find_program(WINE_FOUND wine)
+
+if(WINE_FOUND)
+  message(STATUS "WINE found")
+  SET(CMAKE_CROSSCOMPILING_EMULATOR wine)
+endif()
+
+if (CMAKE_CROSSCOMPILING)
+  message(STATUS "Crosscompiling for ${CMAKE_SYSTEM_NAME}")
+endif()