制作编译工具链
1，Kernel headers setup
2,Binary utilities setup
3, Bootstrap compiler setup
4,C library setup
5,Full compiler setup
1)The compiler seems to be built twice. This is normal and required, because some languages supported by gcc, such C , require glibc support. Hence, a first compiler is built with support for C only, and a full compiler is built once the C library is available.
2)The first step, headers setup is not a must to be the first step. We can alter the step just ensure that that is before C library setup.
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