Ensure the kernel is built (at least, all *.cmd files should be generated):
$ make defconfig
$ make
Clone this repository as ".vscode":
$ git clone git@github.com:amezin/vscode-linux-kernel.git .vscode
Generate compile_commands.json:
$ python .vscode/generate_compdb.py
Open the project:
$ code .
Kernel can be built with separate output directory:
$ make O=../linux-build defconfig
$ make O=../linux-build
In this case, you should pass the directory to generate_compdb.py:
$ python .vscode/generate_compdb.py -O ../linux-build
compile_commands.json will still be generated in the current directory (root of the linux repository).
Unfortunately, tasks.json will not work out of the box in this configuration (TODO).