交叉编译opencv3.4之创建交叉编译工具链（二）

环境：
PC系统: ubuntu16.04LTS
目标开发板： itop4412

1. 源代码收集
   1.1 下载binutils
   网址：https://mirrors.tuna.tsinghua.edu.cn/gnu/binutils/binutils-2.26.1.tar.bz2

   1.2 下载glibc
   两种源代码：
   网址：http://ftp.gnu.org/gnu/glibc/glibc-2.29.tar.gz
   http://ftp.gnu.org/gnu/glibc/glibc-ports-2.16.0.tar.xz

   1.3 下载gcc源码
   下载速度较快
   https://github.com/gcc-mirror/gcc/releases/tag/gcc-4_9_4-release
   下载速度较慢
   ftp://ftp.mpi-sb.mpg.de/pub/gnu/mirror/gcc.gnu.org/pub/gcc/releases/gcc-4.9.0/gcc-4.9.0.tar.bz2

   1.4 下载MPFR
   https://ftp.gnu.org/gnu/mpfr/mpfr-3.1.4.tar.gz

   1.5 下载GMP
   https://gmplib.org/download/gmp/gmp-6.1.2.tar.lz

2. 联编源代码
   2.1 联编binutils
   step1： 进入binutils源文件目录，并执行
   ./configure --disable-werror --build=i686-pc-linux-gnu --target=arm-none-linux-gnueabi --prefix=/usr/local/arm/arm-gcc-2016/bin --with-sysroot=/usr/local/arm/arm-gcc-2016/sysroot

step2： 执行make
step3： 执行make install，结束

2.2 内核头文件安装
step1： 进入内核源代码根目录
step2： 执行make mrproper, 清理环境，是的内核源代码恢复到刚解压时的状态
step3： 执行 make ARCH=arm integrator_defconfig
step4： 执行 make ARCH=arm headers_check，此处出现了错误：原因不知，暂时忽略。

/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/if_pppox.h:24: included file ‘linux/if_pppolac.h’ is not exported
/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/if_pppox.h:25: included file ‘linux/if_pppopns.h’ is not exported
/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/kernel.h:65: userspace cannot reference function or variable defined in the kernel
/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/kernel.h:97: userspace cannot reference function or variable defined in the kernel
/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/quota.h:175: userspace cannot reference function or variable defined in the kernel
/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/soundcard.h:1054: userspace cannot reference function or variable defined in the kernel
/home/liqiang/work/linux/iTop4412_Kernel_3.0/scripts/Makefile.headersinst:91: recipe for target ‘/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/.check’ failed
make[2]: *** [/home/liqiang/work/linux/iTop4412_Kernel_3.0/usr/include/linux/.check] Error 123
/home/liqiang/work/linux/iTop4412_Kernel_3.0/scripts/Makefile.headersinst:99: recipe for target ‘linux’ failed
make[1]: *** [linux] Error 2
Makefile:1079: recipe for target ‘headers_check’ failed
make: *** [headers_check] Error 2

step5： 执行 make ARCH=arm INSTALL_HDR_PATH=/usr/local/arm/arm-gcc-2016/sysroot/usr headers_install，进行头文件安装，结束。

2.3自举GCC（第一阶段）
step1：

./configure
–build=i686-pc-linux-gnu
–host=i686-pc-linux-gnu
–target=arm-none-linux-gnueabi
–prefix=/usr/local/arm/arm-gcc-2016/bin
–without-headers
–enable-boostrap
–enable-languages"c"
–disable-threads
–enable-_cxa_atexit
–disable-libmudflap
–with-gnu-ld --with-gnu-as
–disable-libssp --disable-libgomp
–disable-nls --disable-shared

至此：发现有现成的交叉编译器下载，地址如下
https://releases.linaro.org/components/toolchain/binaries/
故而终止联编交叉编译工具链，时间白白浪费了1天。

接下来进入《交叉编译opencv3.4之下载交叉编译工具链并编译（三）》，待续

本文参考资料：《Linux嵌入式系统高级程序设计 》