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Commit b539a287 authored by Florent Revest's avatar Florent Revest Committed by Alexei Starovoitov
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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: default avatarFlorent Revest <revest@chromium.org>
Link: https://lore.kernel.org/r/20230217151832.27784-1-revest@chromium.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 1f265d2a
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