cross compiling with osxcross, scons and cmake

cross-compile-osxcross.cmake

# OSXCross toolchain
# the name of the target operating system
set(CMAKE_SYSTEM_NAME Darwin)
set(TOOLCHAIN_PREFIX "${OSXCROSS_TARGET}")

set(CMAKE_C_COMPILER "${OSXCROSS_ROOT}/target/bin/${OSXCROSS_TARGET}-cc")
set(CMAKE_CXX_COMPILER "${OSXCROSS_ROOT}/target/bin/${OSXCROSS_TARGET}-c++")

# where is the target environment located
set(CMAKE_FIND_ROOT_PATH "${OSXCROSS_TOOLCHAIN}")

# adjust the default behavior of the FIND_XXX() commands:
# search programs in the host environment
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

# search headers and libraries in the target environment
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

SCSub Example

osx_cross = "osxcross" in env # this is purely so later we can use this multiple times in my case I had multiple cmake builds to handle

if osx_cross:
    root = os.environ.get("OSXCROSS_ROOT", "")
    if env["arch"] == "arm64":
        basecmd = root + "/target/bin/arm64-apple-" + env["osxcross_sdk"] + "-"
        target_path = "arm64-apple-" + env["osxcross_sdk"] + ""
    else:
        basecmd = root + "/target/bin/x86_64-apple-" + env["osxcross_sdk"] + "-"
        target_path = "x86_64-apple-" + env["osxcross_sdk"] + ""
    toolchain_directory = root + "/target/"
    cmake_commands += " -DCMAKE_TOOLCHAIN_FILE=/put/absolute/path/here/or/figure/out/relative/path/cross-compile-osxcross.cmake "
    cmake_commands += " -DOSXCROSS_ROOT=" + root
    extra_commands += " -DOSXCROSS_TARGET=" + target_path
    extra_commands += " -DOSXCROSS_TOOLCHAIN=" + toolchain_directory

cmake_generate_command = "cmake -S {} -B {} -G {}  {} -DCMAKE_BUILD_TYPE={} {}".format(
    example_build, out_build_dir, cmake_generator_type, extra_commands, example_build_type, cmake_opts
)