Build gcc

[★oath 丶]

Hello.
I try to build gcc-8.2.0 from source, it has succeeded. But I have some problems:
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../gcc-8.2.0/configure --prefix=/opt/tools --enable-languages=c,c++,objc,obj-c++,ada,fortran,go,lto --enable-shared --enable-plugin --enable-nls --enable-lto --enable-libmpx --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-multiarch --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
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1. The lib installed in lib32,lib64 and libx32, but I want the files of lib64 installed in /opt/tools/lib.How should I do?
2.The glibc in ubuntu 18.04 LTS is 2.27,but this gcc built with 2.28.How to deal with the relation of them ?
Thanks.
Jack.

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