这里我的gcc是4.5.1 binutils 是2.20.1 ,内核是2.6.35.3.

首先需要交叉编译gcc和binutils

port安装 gcc编译依赖的库gpm,mpfr和mpc.

然后开始编译gcc,这里有个要注意的就是需要指定gmp的include和lib路径,下面是我的config:

./configure –prefix=/opt/local/x86_64_cross –target=x86_64-pc-linux –program-prefix=x86_64-elf- –without-included-gettext –enable-languages=c,c++ –without-headers –disable-nls –enable-obsolete –with-newlib –disable-libgfortran –enable-shared –with-fpmatch=sse –build=x86_64-apple-darwin10 –with-gmp-include=/opt/local/include/ –with-gmp-lib=/opt/local/lib/

然后make all-gcc,然后会遇到下面这个错误:

Undefined symbols:

“_iconv_close”, referenced from:

__cpp_destroy_iconv in libcpp.a(charset.o)

__cpp_destroy_iconv in libcpp.a(charset.o)

__cpp_destroy_iconv in libcpp.a(charset.o)

__cpp_destroy_iconv in libcpp.a(charset.o)

__cpp_destroy_iconv in libcpp.a(charset.o)

__cpp_convert_input in libcpp.a(charset.o)

“_iconv”, referenced from:

_convert_using_iconv in libcpp.a(charset.o)

_convert_using_iconv in libcpp.a(charset.o)

_convert_using_iconv in libcpp.a(charset.o)

_convert_using_iconv in libcpp.a(charset.o)

(maybe you meant: __cpp_destroy_iconv, _cpp_init_iconv )

“_iconv_open”, referenced from:

_init_iconv_desc in libcpp.a(charset.o)

ld: symbol(s) not found

这个问题需要这样解决:

修改 host-x86_64-apple-darwin10/gcc/Makefile找到这一行:LIBICONV = -liconv 然后添加-L/usr/libiconv。

此时可以开始编译kernel了,首先需要前面交叉编译的工具加入到path,然后开始make menuconfig,最后

make ARCH=x86_64 CROSS_COMPILE=x86_64-pc-linux-

这个时候一般会遇到这个编译错误:

arch/x86/boot/header.S: Assembler messages:

arch/x86/boot/header.S:236: Error: can’t resolve `VO__end’ {*UND* section} – `VO__text’ {*UND* section}

这个问题是由于mac下使用的是freebsd的sed,而linux的编译使用的是gnu的sed,因此这里我们需要这样:

[shell]

x86_64-pc-linux-nm vmlinux | sed -n -E ‘s/^([0-9a-fA-F]*) . (_text|end)$$/#define VO\2 0x\1/p’ > arch/x86/boot/voffset.h

[/shell]

这个问题解决之后继续编译此时又会遇到这个错误:

arch/x86/boot/header.o: In function `payload_offset’:

(.header+0x57): undefined reference to `ZO_input_data’

arch/x86/boot/header.o: In function `payload_length’:

(.header+0x5b): undefined reference to `ZO_z_input_len’

make[1]: *** [arch/x86/boot/setup.elf] Error 1

make: *** [bzImage] Error 2

和上面的错误类似,也是由于不同的sed版本引起的,因此我们只需要执行下面的命令:

[shell]

x86_64-pc-linux-nm arch/x86/boot/compressed/vmlinux | sed -n -E ‘s/^([0-9a-fA-F]*) . (startup_32|input_data|end|z.*)$$/#define ZO_\2 0x\1/p’ > arch/x86/boot/zoffset.h

[/shell]

ok,接下来编译的话还会遇到下面的错误:

arch/x86/boot/tools/build.c:32:27: error: sys/sysmacros.h: No such file or directory

make[1]: *** [arch/x86/boot/tools/build] Error 1

make: *** [bzImage] Error 2

这个解决更简单,那就是直接删除include这句。

最后重新make 然后编译成功。