How to modify the source of Buildroot packages for package development?

Question

I\'ve been using buildroot in order to build a toolchain using uclibc. Now, buildroot downloads all the packages, extract

Answer 1

Minimal git submodule + *_OVERRIDE_SRCDIR example

Docs explain it, but here is a faster to parse version.

Directory structure:

• buildroot/: git submodule with buildroot 2017.02

• linux/: git submodule with Linux kernel pointing to your fork at https://github.com/you/linux

• buildroot_override: contains:

  LINUX_OVERRIDE_SRCDIR = ../linux
  

Build and run:

cd buildroot
make qemu_x86_64_defconfig
echo 'BR2_PACKAGE_OVERRIDE_FILE=../buildroot_override' >> .config
make
qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2,if=virtio,format=raw -append root=/dev/vda -net nic,model=virtio -net user

Here is an example project using it.

Answer 2

Please read the Buildroot manual about the <pkg>_OVERRIDE_SRCDIR functionality. It does exactly what you are looking for.