gentoo docker image, cross compiler of stage3
crossdev stage options:
- -s0, --stage0 Build just binutils
- -s1, --stage1 Also build a bare C compiler (no C library/C++/shared GCC libs/C++ exceptions/etc...)
- -s2, --stage2 Also build kernel headers
- -s3, --stage3 Also build the C library
- -s4, --stage4 Also build a full compiler [default]