用buildroot创建交叉编译环境

一、首先从此处 http://buildroot.uclibc.org/downloads/snapshots/ 下载最新的buildroot

buildroot-snapshot.tar.bz2

       tar jxvf buildroot-snapshot.tar.bz2

       cd buildroot

二、配置

对于buildroot的配置可以直接将本目录下的buildroot.config文件直接拷到buildroot目录下并将其改名为.config，也可以直接按照如下所示对其进行配置

       make menuconfig

       Target Architecture (arm)---à

            Target Architecture variant (arm926t) --à

            Target ABI (OABI) ---à

            Build option --à 此项中只作如下修改 (arm-linux-gnu) GNU build hostname suffix   其余都是默认的选项

            Toolchain type (buildroot toolchain) --à

            Toolchain Options ---à

              ---Kernel Header Options

                Kernel Headers (Linux 2.6.22.x kernel headers) -à

              ----uClibc Options

                uClibc C library version (daily snapshot) -à

                (toolchain/uClibc/uClibc-.config) uClibc configuration files to

              [ ] Enable locale/gettext/i8n support?

                Thread library implementation (linux threads (stable/old))--à

              [ ] Thread library debugging

             -----Binutils options

                 Binutils version (binutils 2.18) --à

              () Additional binutils options

               -----Gcc options

                  GCC compiler version (gcc 4.2.1 ) -à

                  [ ] Enable setjmp /longjmp exceptions?

                  () Additional gcc options

                  [ ]Build/install c++ compiler and libstdc++?

                  [ ]Build/install Objective –C compiler and runtime?

                  [ ]Build/install Fortran compiler and runtime?

                  [*]Build/install a shared libgcc?

               -------Ccache Options

                    [ ]Enable ccache support?

               --------Gdb Options

                    [ ]Build gdb debugger for the Target

                    [ ]Build gdb server for the Target

                    [ ]Build gdb for the Host

               ---------elf2flt 未配置该选项

               ---------Common Toolchain Options 未配置该选项

               (-Os –pipe) Target Optimizations

               [*] Include target utils in cross toolchain

<注>因为我们使用单孤的linux内核和busybox版本，所以要将Package Selection for the target、Target Options与Board Support Options三项中的内容全部清空（即去除所有选项）。

$ make all

编译结束后即可在staging_dir目录下看到如下文件：arm-linux arm-linux-uclibc bin include info lib libexec man usr 其中bin中即为相应的交叉编译工具，arm-linux目录下的lib中即为相应的库。

为了验证该交叉编译工具是否可以正常工作，修改 .bash_profile文件中的内容，注释掉 export PATH=$PATH:/usr/local/arm/bin 添加上：

export PATH=$PATH:/home/yyl/project1/buildroot/build_arm/staging_dir/bin

重起系统，通过arm-linux-gcc –version命令可检测到当前arm-linux-gcc版本。