ARM926的Linux工具链的制作(续 : 基于uclibc)

ARM926的Linux工具链的制作(续 : 基于uclibc)

 

本次制作与前一篇类似，出来用uClibc代替了Glibc

 

下载的代码目录 root: /home/lake/arm-uclibc-linux

目标目录

 dir: /home/lake/arm-uclibc-linux/uclibc-tools

 

 

1.           准备工作:

 

下载 Binutil2.17/Gcc3.4.6/uClibc0.9.28/Linux-kernel2.6.24

Patch:

  URL: http://gcc.gnu.org/bugzilla/attachment.cgi?id=6132

此时针对Gcc3.4编译libstd的补丁

 

环境设定

export PREFIX=/home/lake/arm-uclibc-linux/uclibc-tools

export TARGET=arm-uclibc-linux

export TARGET_PREFIX=$PREFIX/$TARGET

export  PATH=$PREFIX/bin:$PATH

编译的host环境是LFS6.3 /Gcc4.1.2版本,不过在Redhat Enterprise Linux4或者5上也可以编译通过。

lake:~/mysrc$ uname  -a

Linux LFS 2.6.24 #2 SMP Thu Apr 30 03:05:00 CST 2009 i686 i686 i386 GNU/Linux

lake:~/mysrc$

 

2.             编译binutil

 

#mkdir binutils

# cd build_binutils

# rm -fr *

# ../binutils-2.17/configure --target=$TARGET --prefix=$PREFIX --disable-multilib --disable-nls

# make all

# make install

 

3.           获得核心针对ARM926的头文件

cd  ~/lfs/linux-2.6.24  

make ARCH=arm CROSS_COMPILE=arm-linux-  defconfig

#make ARCH=arm CROSS_COMPILE=arm-linux-  menuconfig ------> Select ARM type

make ARCH=arm CROSS_COMPILE=arm-linux- 

make include/linux/version.h

cp -ar include/linux ${TARGET_PREFIX}/include/

cp -ar include/asm-arm ${TARGET_PREFIX}/include/asm

cp -ar include/asm-generic ${TARGET_PREFIX}/include/asm-generic

 cd $TARGET_PREFIX/

 ln -s include sys-include  ###GCC编译时候默认使用sys-include,做一个软连接

 

4.           编译GCC---第一阶段

 

patch URL: http://gcc.gnu.org/bugzilla/attachment.cgi?id=6132

 

lake:~/arm-uclibc-linux$ patch -p1 -d gcc-3.4.6 < gcc3.4-libstdc++-uclibc.patch

 ==============================================================

###Compile first stage gcc

# mkdir build_bootstrap

# cd build_bootstrap

# rm -fr *   ---à必须删除就的编译

#  

../gcc-3.4.6/configure --target=$TARGET --prefix=$PREFIX /

--with-local-prefix=$TARGET_PREFIX --disable-multilib /

--with-newlib --disable-nls --enable-threads=no --enable-symvers=gnu /

--enable-__cxa_atexit --enable-languages=c --disable-shared /

 

注意有些编译器版本支持 --with-float=soft --with-softfloat-supp，这对编译U-boot有帮助，不过在Gcc3.4.6上，笔者未试成功

# make all-gcc

# make install-gcc

 

 

5.           编译uClibc

==================

#### 进入uClibc的解压目录

# make CROSS=arm-uclibc-linux-   menuconfig

-----> Choose ARM/ARM926T   . 

-----> Kernel header dir :  /home/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux

 

if not enable GCC"--with-float=soft --with-softfloat-supp", enable the following options

-----> Enable FPU etc

            │ │[*] Enable floating point number support       

            │ │[*]   Target CPU has a floating point unit (FPU) 

            │ │[*]   Enable full C99 math library support  

 

if enable GCC"--with-float=soft --with-softfloat-supp", disable all FPU options

               Target Processor Type (Arm 926T)  --->

            │ │[ ] Enable floating point number support    

## 以上是针对FPU软件实现的选择，在本例中，全选中FPU

 

# make CROSS=arm-uclibc-linux-

# make PREFIX=$TARGET_PREFIX install

 

 

6.           完整的编译GCC链接uClibc

=================

###Compile final stage gcc

# mkdir build_gcc2

# cd build_gcc2

# rm -fr *   ---->必须清除上次的编译文件

#

../gcc-3.4.6/configure --target=$TARGET --prefix=$PREFIX /

--with-local-prefix=$TARGET_PREFIX /

--enable-multilib /

--disable-nls /

--enable-threads=posix /

--enable-symvers=gnu /

--disable-__cxa_atexit /

--enable-languages=c,c++ /

--enable-shared /

--enable-c99 /

--enable-long-long /

--with-headers=$TARGET_PREFIX/include /

--with-libs=$TARGET_PREFIX/lib

# make all

make install

注: --with-float=soft --with-softfloat-supp  软件FPU本文部支持

 

7.           修改Gcc的默认链接spec文件

这一步很重要， Gcc默认的动态连接器是/lib/ld-linux.so.x，与glibc连接。需要修改为ld-uClibc.so

 

===============================================================

## Update Cross GCC spec

vi    $PREFIX/lib/gcc/arm-uclibc-linux/3.4.6/specs

 

 %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}

修改为 %{!dynamic-linker:-dynamic-linker /lib/ld-uClibc.so.0}

 

 

1. OK, 我们测试一下

测试的平台为一个已经运行的ARM926的Linux系统

 

/mnt/lake/mysrc $ uname -a

Linux (none) 2.6.14-xxxxxx-release #1 Sat Mar 21 18:06:04 CST 2009 armv5tejl unknown

~ $ cat /proc/cpuinfo

Processor       : ARM926EJ-Sid(wb) rev 5 (v5l)

BogoMIPS        : 146.63

Features        : swp half thumb fastmult edsp java

CPU implementer : 0x41

CPU architecture: 5TEJ

CPU variant     : 0x0

CPU part        : 0x926

CPU revision    : 5

Cache type      : write-back

Cache clean     : cp15 c7 ops

Cache lockdown  : format C

Cache format    : Harvard

I size          : 16384

I assoc         : 4

I line length   : 32

I sets          : 128

D size          : 16384

D assoc         : 4

D line length   : 32

D sets          : 128

 

Hardware        : Hi3511v100

Revision        : 0000

Serial          : 0000000000000000

~ $

目标机器昂已经存在uClibc的相关动态dll文件

/ $ ls /lib

ld-uClibc-0.9.28.so     libm-0.9.28.so          librt.so.0

ld-uClibc.so.0          libm.so.0               libthread_db-0.9.28.so

libc.so.0               libnsl-0.9.28.so        libthread_db.so.1

libcrypt-0.9.28.so      libnsl.so.0             libuClibc-0.9.28.so

libcrypt.so.0           libpthread-0.9.28.so    libutil-0.9.28.so

libdl-0.9.28.so         libpthread.so.0         libutil.so.0

libdl.so.0              libresolv-0.9.28.so     modules

libgcc_s.so             libresolv.so.0

libgcc_s.so.1           librt-0.9.28.so

 

测试程序

lake:~/mysrc$ cat hello.c

#include <stdio.h>

 

int main()

{

 printf("hello  /n");

 return 1;

}

 

lake:~/mysrc$ cat hello.cpp

 

#include <iostream>

    int main()

    {

        std::cout << "Hello, world!/n" << std::endl;

    }

lake:~/mysrc$ ~/arm-uclibc-linux/uclibc-tools/bin/arm-uclibc-linux-gcc -v

Reading specs from /home/lake/arm-uclibc-linux/uclibc-tools/lib/gcc/arm-uclibc-linux/3.4.6/specs

Configured with: ../gcc-3.4.6/configure --target=arm-uclibc-linux --prefix=/home/lake/arm-uclibc-linux/uclibc-tools --with-local-prefix=/home/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux --enable-multilib --disable-nls --enable-threads=posix --enable-symvers=gnu --disable-__cxa_atexit --enable-languages=c,c++ --enable-shared --enable-c99 --enable-long-long --with-headers=/home/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux/include --with-libs=/home/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux/lib

Thread model: posix

gcc version 3.4.6

 

在host机器上编译

lake:~/mysrc$ arm-uclibc-linux-gcc  hello.c -o hello

lake:~/mysrc$ arm-uclibc-linux-g++  hello.cpp -o hellocpp

 

在目标机器上运行, /mnt/lake/sysrc为在目标机器上挂接的NFS目录

/mnt/lake/mysrc $ /mnt/lake/mysrc/hello

hello

/mnt/lake/mysrc $ ./hellocpp

./hellocpp: can't load library 'libstdc++.so.6'

由于目标板上/lib中没有C++需要的动态链接库,因此设定LD_LIBRARY_PATH使其指向NFS挂接的host机器上的libstdc++.so所在目录

/mnt/lake/mysrc $ echo   $LD_LIBRARY_PATH

/usr/local/lib:/usr/lib

 

/mnt/lake/mysrc $ export LD_LIBRARY_PATH=/mnt/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux/lib:$LD_LIBRARY_PATH

/mnt/lake/mysrc $ echo   $LD_LIBRARY_PATH

/mnt/lake/arm-uclibc-linux/uclibc-tools/arm-uclibc-linux/lib:/usr/local/lib:/usr/lib

/mnt/lake/mysrc $ ./hellocpp 

Hello, world!

 

执行成功