Yocto compiling old kernel in newer distro

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I have an embedded device with a custom kernel (3.14). Until now I have used jethro distribution to generate kernel and fs image. I would like to upgrade a bit and move my machine to dunfell distro but I have several problems.

Trying myself and based on googling around I came to that conclusion compiling an old kernel with (much) newer gcc is kinda impossible. So what I have tried is copying gcc_4.9 recipes into dunfell and set the gcc (and glibc?) version for that particular machine. I found it very difficult to solve this as well because

The glibc and gcc recipe structures changed a lot and use very differenc environment variables, eg. there are no more glibc-initial packages and virtual/${TARGET_SYS}libc-for-gcc packages are not provided by any glibc anymore. There are a lot of changes in the gcc recipes as well (environment variables, dependencies, etc) and I assume they have also modified the sources for that purpose (providing empy headers or such - so no "-initial" packages needed). As much as I could backtrack it the "transition" happened betwen thud and warrior distros.

What I'm asking for / things you can help me with:

  • if someone is familiar with this "transition" in gcc recipes/sources and can explain it or point me to a source where I can find relevant information or
  • if someone already has a working gcc/libc package for dunfell thats <= 7.0 version or
  • if someone has any idea I can try to make it work

I would greatly appreciate it. Thank you.

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