許多實用cmake的開源專案在移植到其他平台時，還是比較麻煩的。
這裡以jsoncpp為例。
首先，我本機的交叉編譯工具及目錄是：
# which arm-linux-gnueabihf-gcc
/root/board/tools/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin/arm-linux-gnueabihf-gcc
# git clone根據自己的配置改下如下：
# this one is important
set(cmake_system_name linux)
#this one not so much
set(cmake_system_version 1)
# specify the cross compiler
set(cmake_c_compiler /root/board/tools/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin/arm-linux-gnueabihf-gcc)
set(cmake_cxx_compiler /root/board/tools/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin/arm-linux-gnueabihf-g++)
set(cmake_strip /root/board/tools/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin/arm-linux-gnueabihf-strip)
# where is the target environment
set(cmake_find_root_path /usr/arm-linux-gnueabihf)
# search for programs in the build host directories
set(cmake_find_root_path_mode_program never)
# for libraries and headers in the target directories
set(cmake_find_root_path_mode_library only)
set(cmake_find_root_path_mode_include only)
然後進入jsoncpp目錄：
# cd jsoncpp
# mkdir build
# cd build
cmake -dcmake_build_type=none -djsoncpp_lib_build_static=on -djsoncpp_lib_build_shared=on -dcmake_install_prefix=/usr/arm-linux-gnueabihf -dcmake_toolchain_file=~/toolchain.cmake -g "unix makefiles" ..在build下生成：
cmakecache.txt cmake_install.cmake include pkg-config
cmakefiles ctesttestfile.cmake makefile src
# make
scanning dependencies of target jsoncpp_lib_static
[ 11%] building cxx object src/lib_json/cmakefiles/jsoncpp_lib_static.dir/json_reader.cpp.o
[ 22%] building cxx object src/lib_json/cmakefiles/jsoncpp_lib_static.dir/json_value.cpp.o
/mnt/win/src.emb/scanner/vendor/jsoncpp/src/lib_json/json_value.cpp: in copy constructor 『json::value::czstring::czstring(const json::value::czstring&)』:
/mnt/win/src.emb/scanner/vendor/jsoncpp/src/lib_json/json_value.cpp:275:78: warning: conversion to 『unsigned char:2』 from 『unsigned int』 may alter its value [-wconversion]
[ 33%] building cxx object src/lib_json/cmakefiles/jsoncpp_lib_static.dir/json_writer.cpp.o
[ 44%] linking cxx static library libjsoncpp.a
[ 44%] built target jsoncpp_lib_static
scanning dependencies of target jsontestrunner_exe
[ 55%] building cxx object src/jsontestrunner/cmakefiles/jsontestrunner_exe.dir/main.cpp.o
[ 66%] linking cxx executable jsontestrunner_exe
[ 66%] built target jsontestrunner_exe
scanning dependencies of target jsoncpp_test
[ 77%] building cxx object src/test_lib_json/cmakefiles/jsoncpp_test.dir/jsontest.cpp.o
[ 88%] building cxx object src/test_lib_json/cmakefiles/jsoncpp_test.dir/main.cpp.o
[100%] linking cxx executable jsoncpp_test
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