Kito Cheng <kito.cheng@gmail.com> writes:

> I am thinking that maybe we should add
> -mlibc=[newlib|newlib-nano|picolibc|unknown] option to bare-matel
> toolchain, one reason is having an unify interface to select libc
> implementation between clang/LLVM, spec file is a GCC specific stuff,
> that cause very bad compatibility between GCC and clang/LLVM, and
> having option to control that would be better since clang/LLVM don't
> have those configure time option.

You can create specs file for each library so that you select the
library with --specs=picolibc.specs or --specs=newlib-nano.specs. That
seems sufficient as you can mess with various compiler options and set
the header paths. Crosstool-ng does this and it enables delivering
newlib, newlib-nano and picolibc in the same toolchain.

-- 
-keith