(including bionic library) can be compiled from source and installed as a native compiler on most amd64/Intel64 desktop running Linux, without using any propriety binary code. Just like uclibc toolchain can be brought to /usr/x86_64-pc-linux-uclibc via crossdev script.
Ebuild scripts compiling and installing bionic library (libc.so, libm.so, ...), dynamic interpreter /system/bin/linker and /system/bin/linker64 are here since 19 Nov 2015; full-featured gcc/g++ is here since 12 Dec 2015.
See INSTALL/manual.txt for installation instructions.
I prefer to get bug-reports via Github mechanism. If you want to teach me how to do something in an elegant or standard way, enclose a patch. If you report a bug, supply enough information for me to reproduce it.
All ebuilds bundled in this project only use https download (no git/cvs/...). Which means you can run them on a computer not connected to Internet (just plant all required .zip to distfiles/).
My ebuild scripts always take fixed version of software (by setting a specific value of SHA1), so they don't get broken by a software update. And I won't change that version or download source without a reason (such as smaller download size, error fixing, smaller size of library, faster operation).