Partial compilation of openwrt project

I would like to get an idea or reference to compile only subset on the openwrt project. i am aware of the menuconfig utility but this is not enough for my goal.

i would like to compile only the tool-chain (binutils + gcc + glibc) for a specific target (ar71xx) and also the kernel.

now, after looking in the makefiles etc, i have noticed that most of the work in actually patching the toolchain 开发者_Python百科and the kernel and then compile it. is there any option to stop build process after the patching so i can have only the source code patched and i can write my own make file to compile it?

To prepare (patch) toolchain independently:

make toolchain/{clean,prepare} V=99

To extract the kernel source and patch it:

make target/linux/{clean,prepare} V=99

The patched kernel source will be in build_dir/linux-$(target)/linux-$(version)