This template is designed to be used to create gba homebrew using the Tonc Library. The template is based off of devkitPro's devkitARM template, but using tonclib instead of libgba. If you want to make homebrew the tonc tutorial is the best place to learn to do so, even if you intend to use libgba afterwards.
Clone this repository, rename the folder to the name of your project, and rename
tonc_template.c in src/ to the name of your project or to
main.c (standard practice seems to be project name, but either should work). Change what you want in Makefile, and then get to coding.
All credit for tonclib goes to cearn.