自己建个交叉编译器，编译新kernel

Question

今天收拾屋子，发现2440的破板子落了厚厚的一层灰了，拿出来发现还能用，就索性重新玩了一下，不知道是用的编译器太老还是怎么的，编译不过去了

2. [root@T-bagwell linux-2.6]# arm-linux-gcc -v
3. Reading specs from /usr/local/arm/3.3.2/lib/gcc-lib/arm-linux/3.3.2/specs
4. Configured with: ../gcc-3.3.2/configure --target=arm-linux --with-cpu=strongarm1100 --prefix=/usr/local/arm/3.3.2 i686-pc-linux-gnu --with-headers=/work/kernel.h3900/include --enable-threads=pthreads --enable-shared --enable-static --enable-languages=c,c++
5. Thread model: posix
6. gcc version 3.3.2

复制代码代码是git从kernel上clone下来的，结果编译的过程中出现了一些小问题，然后索性自己想了一下，重新弄一下编译器吧，就从ftp.gnu.org上down了个最新的release的版本
然后编译gcc，用新的gcc编译linuxkernel，生成zImage，然后扔在板子上跑了一下，发现能跑，发一下心得

首先做一下binutils

1. [root@T-bagwell binutils-2.21]# ./configure --build=i686-pc-linux-gnu --target=arm-linux --prefix=/usr/local/arm/gcc-4.6.0/ --disable-nls --enable-shared --disable-multilib
2. [root@T-bagwell binutils-2.21]# make configure-host
3. [root@T-bagwell binutils-2.21]# make
4. [root@T-bagwell binutils-2.21]# make install
5. [root@T-bagwell binutils-2.21]# cp -vp include/libiberty.h /usr/local/arm/gcc-4.6.0/include

复制代码然后安装mpc,mpfr,gmp，要不会报错

1. configure: error: Building GCC requires GMP 4.2+, MPFR 2.3.1+ and MPC 0.8.0+.
2. Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
3. their locations. Source code for these libraries can be found at
4. their respective hosting sites as well as at
5. ftp://gcc.gnu.org/pub/gcc/infrastructure/. See also
6. http://gcc.gnu.org/install/prerequisites.html for additional info. If
7. you obtained GMP, MPFR and/or MPC from a vendor distribution package,
8. make sure that you have installed both the libraries and the header
9. files. They may be located in separate packages.

复制代码下载并安装gmp.mpfr,mpc就可以了

2. [root@T-bagwell mnt]# wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz
3. [root@T-bagwell mnt]# wget ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-4.3.2.tar.bz2
4. [root@T-bagwell mnt]# wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2
5. [root@T-bagwell mnt]# tar zxvf mpc-0.8.1.tar.gz
6. [root@T-bagwell mnt]# tar jxvf gmp-4.3.2.tar.bz2
7. [root@T-bagwell mnt]# tar jxvf mpfr-2.4.2.tar.bz2

复制代码然后接着开始编译

2. [root@T-bagwell mnt]# cd gmp-4.3.2
3. [root@T-bagwell gmp-4.3.2]# ./configure --prefix=/usr/local/ --enable-shared
4. [root@T-bagwell gmp-4.3.2]# make;make install
5. [root@T-bagwell gmp-4.3.2]# cd ..;cd mpfr-2.4.2
6. [root@T-bagwell mpfr-2.4.2]# ./configure --prefix=/usr/local/ --enable-shared --with-gmp=/usr/local/lib
7. [root@T-bagwell mpfr-2.4.2]# make;make install
8. [root@T-bagwell mpfr-2.4.2]# cd ..;cd mpc-0.8.1
9. [root@T-bagwell mpc-0.8.1]# ./configure --prefix=/usr/local --with-gmp=/usr/local/lib --with-mpfr=/usr/local/lib
10. [root@T-bagwell mpc-0.8.1]# make;make install
11. [root@T-bagwell mpc-0.8.1]# cd ..

复制代码然后编译gcc

2. [root@T-bagwell gcc-build]# AR=ar LDFLAGS="-Wl,-rpath,/usr/local/lib" ../gcc-4.6.0/configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=arm-linux --prefix=/usr/local/arm/gcc-4.6.0 --disable-shared --enable-static --enable-languages=c --without-headers --disable-threads --disable-multilib --disable-nls --disable-decimal-float --disable-libgomp --disable-libmudflap --disable-libssp --without-headers --with-newlib
3. [root@T-bagwell gcc-build]# make all-gcc all-target-libgcc
4. [root@T-bagwell gcc-build]# make install-gcc install-target-libgcc

复制代码这样，交叉编译器就做好了，看一下

2. [root@T-bagwell gcc-build]# arm-linux-gcc -v
3. Using built-in specs.
4. COLLECT_GCC=arm-linux-gcc
5. COLLECT_LTO_WRAPPER=/usr/local/arm/gcc-4.6.0/libexec/gcc/arm-linux/4.6.0/lto-wrapper
6. Target: arm-linux
7. Configured with: ../gcc-4.6.0/configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=arm-linux --prefix=/usr/local/arm/gcc-4.6.0 --disable-shared --enable-static --enable-languages=c --without-headers --disable-threads --disable-multilib --disable-nls --disable-decimal-float --disable-libgomp --disable-libmudflap --disable-libssp --without-headers --with-newlib
8. Thread model: single
9. gcc version 4.6.0 (GCC)
11. [root@T-bagwell gcc-build]# ls /usr/local/arm/gcc-4.6.0/bin/
12. addr2line            arm-linux-c++filt    arm-linux-gcov    arm-linux-objcopy  arm-linux-strings  event_rpcgen.py  objcopy  phar        phpize   strip
13. ar                   arm-linux-cpp        arm-linux-gprof   arm-linux-objdump  arm-linux-strip    gprof            objdump  phar.phar   ranlib
14. arm-linux-addr2line  arm-linux-elfedit    arm-linux-ld      arm-linux-ranlib   as                 ld               pear     php         readelf
15. arm-linux-ar         arm-linux-gcc        arm-linux-ld.bfd  arm-linux-readelf  c++filt            ld.bfd           peardev  php-cgi     size
16. arm-linux-as         arm-linux-gcc-4.6.0  arm-linux-nm      arm-linux-size     elfedit            nm               pecl     php-config  strings
17. [root@T-bagwell gcc-build]#

复制代码可以交叉编译一下linuxkernel试试

2. [root@T-bagwell gcc-build]# cd /media/mnt/linux-2.6/
3. [root@T-bagwell linux-2.6]# git branch
4. LiuQi
5. master
6. * s3c2440
7. [root@T-bagwell linux-2.6]#
8. [root@T-bagwell linux-2.6]# cp arch/arm/configs/mini2440_defconfig /media/mnt/linux-2.6/KERNEL_OBJ/.config
9. [root@T-bagwell linux-2.6]# make ARCH=arm CROSS_COMPILE=arm-linux- O=/media/mnt/linux-2.6/KERNEL_OBJ zImage

复制代码编译完成以后，可以看一下编译出来以后的文件

2. [root@T-bagwell linux-2.6]# file KERNEL_OBJ/arch/arm/boot/compressed/vmlinux
3. KERNEL_OBJ/arch/arm/boot/compressed/vmlinux: ELF 32-bit LSB executable, ARM, version 1, statically linked, not stripped
4. [root@T-bagwell linux-2.6]#

复制代码搞定