I guess if it can make problem if we use a Yocto to generate linux environment (kernel, rootfs) and if we develop extra tools & application with linaro chain with cross compiling.
Our situation is :
We use Yocto to generate ROOTFS (with lib/libc-2.20-2014.11.so for example) and we use gcc-linaro-5.2-2015.11-2-x86_64_arm-linux-gnueabihf.tar.xz to have a toolchain to make extra development we need to develop outside yocto space.
The toolchain use libc-2.21.so library and different .H files from ROOTFSSDK we generate from yocto ( libc-2.20-2014.11.so for example).
I work but we guess if it can cause execution error sometime.
Is it a way to use yocto toolchain in our development space ?