linux/tools/scripts
Florent Revest b539a287ba selftests/bpf: Fix cross compilation with CLANG_CROSS_FLAGS
I cross-compile my BPF selftests with the following command:

CLANG_CROSS_FLAGS="--target=aarch64-linux-gnu --sysroot=/sysroot/" \
  make LLVM=1 CC=clang CROSS_COMPILE=aarch64-linux-gnu- SRCARCH=arm64

(Note the use of CLANG_CROSS_FLAGS to specify a custom sysroot instead
of letting clang use gcc's default sysroot)

However, CLANG_CROSS_FLAGS gets propagated to host tools builds (libbpf
and bpftool) and because they reference it directly in their Makefiles,
they end up cross-compiling host objects which results in linking
errors.

This patch ensures that CLANG_CROSS_FLAGS is reset if CROSS_COMPILE
isn't set (for example when reaching a BPF host tool build).

Signed-off-by: Florent Revest <revest@chromium.org>
Link: https://lore.kernel.org/r/20230217151832.27784-1-revest@chromium.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-02-22 13:04:55 -08:00
..
Makefile.arch tools, build: Add RISC-V to HOSTARCH parsing 2021-11-01 17:08:21 +01:00
Makefile.include selftests/bpf: Fix cross compilation with CLANG_CROSS_FLAGS 2023-02-22 13:04:55 -08:00
utilities.mak kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00