Reuse staging_dir and build_dir from sdk to speed up compilation from source

For Developers
1

Usually compile from source take hours ( basically due to tools/llvm-bpf ). I tried downloading the SDK and decompressing the build_dir and staging_dir inside the git source directory so that lvm-bpf would not need to be compiled, but apparenly the build from source still compils the llvm-bpf. Is there anyway to make that work?

2

Don't build it?

CONFIG_BPF_TOOLCHAIN_HOST_PATH="/usr/lib/llvm-19"
CONFIG_USE_LLVM_HOST=y

and people tend to change build parameters when building their own.

3

Don't build it?

Very funny :slight_smile:
I have some custom packages that for some odd reason do not compile using the sdk only. And since I will have to compile the source completely I add several applets to busybox.

CONFIG_BPF_TOOLCHAIN_HOST_PATH="/usr/lib/llvm-19"
CONFIG_USE_LLVM_HOST=y

and people tend to change build parameters when building their own.

Thank you very much!

4

Colour me confused? It takes hours to build llvm, so do not do that. download whatever version and point at the install. Or not if you like building things.

1 Like
5

You can download the compiled llvm for your target even if you otherwise compile everything from sources for the full toolchain...