How to set up a Linux environment so that the main compiler is a crosscompiler?

Question

linux

Dear everyone!
Platform on Linux (Ubuntu).
A cross-platform compiler is installed (in its own folder).
Accordingly, if we are compiling code for a native platform, I simply use GCC
If I am compiling for a cross platform, I run the corresponding compiler like /home/work/openwrt/....../.....gcc
As . configure the entire Linux environment to use only the host compiler (default).
The problem is that when trying to compile libraries (for example https://github.com/brgl/libgpiod) an error occurs due to the fact (in my opinion) that the gcc linux compiler is used, and not the openwrt cross compiler in my example.

Answer 1

There is a make utility for building. I recommend to study, and strongly!

Answer 2

man update-alternatives

Answer 3

Isn't it easier to pull up libgpiod as a package in openwrt (if it's still not there)?