set(CMAKE_SYSTEM_NAME Linux)
set(TOOLCHAIN_PREFIX armv7a-unknown-linux-gnueabihf)

set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)

set(CMAKE_FIND_ROOT_PATH "/usr/${TOOLCHAIN_PREFIX};/usr/lib/gcc/${TOOLCHAIN_PREFIX}/;${CMAKE_CURRENT_BINARY_DIR}/deps")

# modify default behavior of FIND_XXX() commands to
# search for headers/libs in the target environment and
# search for programs in the build 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)

# Export the chosen compiler via CXX and CC, because it's entirely possible
# one of child build scripts will call out to something that relies on these
# to discover the compiler (or will otherwise choose the wrong one).
set ($ENV{CXX} "${CMAKE_CXX_COMPILER}")
set ($ENV{CC} "${CMAKE_C_COMPILER}")