On 11/26/21 9:36 PM, Quentin Monnet wrote:
On Mon, 22 Nov 2021 at 19:23, Jean-Philippe Brucker
<jean-philippe@xxxxxxxxxx> wrote:
Add support for cross-building BPF tools and selftests with clang, by
passing LLVM=1 or CC=clang to make, as well as CROSS_COMPILE. A single
clang toolchain can generate binaries for multiple architectures, so
instead of having prefixes such as aarch64-linux-gnu-gcc, clang uses the
-target parameter: `clang -target aarch64-linux-gnu'.
Patch 1 adds the parameter in Makefile.include so tools can easily
support this. Patch 2 prepares for the libbpf change from patch 3 (keep
building resolve_btfids's libbpf in the host arch, when cross-building
the kernel with clang). Patches 3-6 enable cross-building BPF tools with
clang.
The set looks good to me. I checked that the tools are still building
(without cross-compiling). I currently have issues building the
selftests on my setup, but they don't appear to be related to this
patchset.
Acked-by: Quentin Monnet <quentin@xxxxxxxxxxxxx>
Note that on bpf-next, patch 5 (runqslower) has a conflict with
be79505caf3f ("tools/runqslower: Install libbpf headers when
building").
Jean-Philippe, please do one rebase spin for addressing the above.
Thanks,
Daniel
