Macbook搭建交叉编译工具以及区别
引用请标明出处：http://blog.csdn.net/callon_h/article/details/51308755
内容均为实践所得。
参考网址：
http://www.51hei.com/bbs/dpj-19125-1.html
具体内容：
首先需要安装macports，分享地址：
http://pan.baidu.com/s/1dFz4GKT
http://www.macports.org/install.php
安装完成后我们使用命令：
callondeMacBook-Pro:~ callon$ sudo port install libelf
Password:
Error: Port libelf not found居然是没有找到，原因是我们需要更新macports：
callondeMacBook-Pro:~ callon$ sudo port -v selfupdate
---> Updating MacPorts base sources using rsync
receiving file list ... done
base.tar
sent 31276 bytes received 223560 bytes 8090.03 bytes/sec
total size is 27013120 speedup is 106.00
receiving file list ... done
---> MacPorts base is already the latest version
The ports tree has been updated. To upgrade your installed ports, you should run
port upgrade outdated
callondeMacBook-Pro:~ callon$
callondeMacBook-Pro:~ callon$ sudo port upgrade outdated
Password:
Nothing to upgrade.
callondeMacBook-Pro:~ callon$ sudo port search libelf
libelf @0.8.13_2 (devel)
ELF object file access library
py-pylibelf @0.1.20110915 (python, devel)
Pythonic wrapper for the libelf library.
py27-pylibelf @0.1.20110915 (python, devel)
Pythonic wrapper for the libelf library.
Found 3 ports.此时就说明我们可以正常使用macports安装软件了，下面开始正式操作：
callondeMacBook-Pro:~ callon$ sudo port install libelf出现：
---> Installing libelf @0.8.13_2
---> Activating libelf @0.8.13_2
---> Cleaning libelf
---> Updating database of binaries
---> Scanning binaries for linking errors
---> No broken files found.即为安装成功。
同理：
callondeMacBook-Pro:~ callon$ sudo port install gsed
callondeMacBook-Pro:~ callon$ sudo port install arm-elf-binutils
callondeMacBook-Pro:~ callon$ sudo port install arm-elf-gcc此时我们的裸机编译环境其实就搭建好了，但是我们需要把裸机makefile的所有之前用的arm-linux-xxx换成现在的arm-elf-xxx即可！
callondeMacBook-Pro:hkl-continue callon$ make clean
rm -f *.o *.elf *.bin
make -C dev clean
rm -f *.o
make -C lib clean
rm -f *.o
callondeMacBook-Pro:hkl-continue callon$ make
arm-elf-gcc -g -c start.S
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c main.c
make -C dev all
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c mmu.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c interrupt.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c gpio.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c uart.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c nandflash.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c lcd.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c dma.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c bmp.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c bmpp.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c timer.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c touch.c
arm-elf-ld -r -o dev.o mmu.o interrupt.o gpio.o uart.o nandflash.o lcd.o dma.o bmp.o bmpp.o timer.o touch.o
arm-elf-gcc -g -c mem.S
make -C lib all
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c div64.S
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c lib1funcs.S
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c ctype.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c muldi3.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c printf.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c string.c
arm-elf-gcc -g -fno-builtin -I/Users/callon/Desktop/hkl-continue/include -c vsprintf.c
arm-elf-ld -r -o lib.o div64.o lib1funcs.o ctype.o muldi3.o printf.o string.o vsprintf.o
arm-elf-ld -Thkl.lds -o hkl_boot.elf start.o main.o dev/dev.o mem.o lib/lib.o
arm-elf-objcopy -O binary hkl_boot.elf hkl_boot.bin
arm-elf-objdump -D -S hkl_boot.elf > dump
callondeMacBook-Pro:hkl-continue callon$ ls
Makefile hkl.lds include main.o start.S
dev hkl_boot.bin lib mem.S start.S~
dump hkl_boot.elf main.c mem.o start.o同样的尝试了安装arm-none-eabi-工具链，也能编译裸机代码：
callondeMacBook-Pro:s3c-linux-2.6.28.6-Real6410 callon$ sudo port install arm-none-eabi-gcc但是编译不了内核，总会出现莫名其妙的问题。
＊＊＊最后现象总结：＊＊＊
arm-none-eabi- 能够编译内核模块，能够编译裸机代码，但是在编译应用程序会出错：
callondeMacBook-Pro:key_irq_misc callon$ arm-none-eabi-gcc -static key_app.c -o key_app
key_app.c: 在函数‘main’中:
key_app.c:9:8: 警告：隐式声明函数‘open’ [-Wimplicit-function-declaration]
fd = open("/dev/6410key",0);
^
key_app.c:11:3: 警告：隐式声明函数‘read’ [-Wimplicit-function-declaration]
read(fd, &key_num, 4);
^
key_app.c:15:3: 警告：隐式声明函数‘close’ [-Wimplicit-function-declaration]
close(fd);
^
/opt/local/lib/gcc/arm-none-eabi/5.1.0/../../../../arm-none-eabi/bin/ld: cannot find crt0.o: No such file or directory
collect2: 错误：ld 返回 1arm-elf- 能够编译出应用程序和裸机代码：
callondeMacBook-Pro:key_irq_misc callon$ arm-elf-gcc -static key_app.c -o key_app
callondeMacBook-Pro:key_irq_misc callon$ ls但是编译不了内核模块：
callondeMacBook-Pro:key_irq_misc callon$ make
make -C /Users/callon/Documents/s3c-linux-2.6.28.6-Real6410 M=/Users/callon/Desktop/key_irq_misc modules CROSS_COMPILE=arm-elf- ARCH=arm
CC [M] /Users/callon/Desktop/key_irq_misc/key.o
/Users/callon/Desktop/key_irq_misc/key.c:1:0: error: FPA is unsupported in the AAPCS
make[2]: *** [/Users/callon/Desktop/key_irq_misc/key.o] Error 1
make[1]: *** [_module_/Users/callon/Desktop/key_irq_misc] Error 2
make: *** [all] Error 2最后还有一种交叉编译工具：
参考http://blog.csdn.net/rk2900/article/details/8738442
新建一个磁盘映像：
磁盘工具->文件->新建映像->空白映像
有时你的磁盘映像还是不区分大小写，你可以在磁盘映像下建立两个readme和Readme文件夹来测试，如果的确还是不区分，就磁盘工具选择：磁盘映像->抹掉
再操作一次就完全正确了，你可以进行测试。
然后将下载好的ARMx-2009q3-67.tar.bz2，链接在参考的blog中有提到，这里再啰嗦一下：
https://github.com/downloads/UnhandledException/ARMx/ARMx-2009q3-67.tar.bz2
拷贝到磁盘映像下，执行命令：
最后修改/etc/profile把path环境变量修改了，然后source /etc/profile即可！
最后修改内核代码中.config或者Makefile里对CROSS_COMPILE的定义，改成arm-none-linux-gnueabi-即可，此时就可以进行内核代码编译了:
编译完内核再编译内核模块也就不会有莫名其妙的问题了：
成功！
但是裸机代码拿arm-none-linux-gnueabi- 编译会有问题。
此博文得到的结论均为实践与查找资料所得，仅供参考。