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selftests/bpf: Avoid static LLVM linking for cross builds

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The BPF selftests prefer static LLVM linking, which works for native
builds but can break cross builds. Its --link-static output may include
host-only libraries that are unavailable for the cross compilation,
causing link failures.

Avoid static LLVM linking for cross builds and use shared LLVM libraries
instead. Native builds keep the existing behavior.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20260602-tools_build_fix_zero_init_bpf_only-v2-8-c76e5250ea1c@arm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Leo Yan 2026-06-02 15:47:17 +01:00 committed by Alexei Starovoitov
parent 584f3b7a35
commit 62617d28d9
1 changed files with 9 additions and 2 deletions
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11
tools/testing/selftests/bpf/Makefile
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@ -194,8 +194,15 @@ ifeq ($(feature-llvm),1)
LLVM_CONFIG_LIB_COMPONENTS := mcdisassembler all-targets
# both llvm-config and lib.mk add -D_GNU_SOURCE, which ends up as conflict
LLVM_CFLAGS += $(filter-out -D_GNU_SOURCE,$(shell $(LLVM_CONFIG) --cflags))
# Prefer linking statically if it's available, otherwise fallback to shared
ifeq ($(shell $(LLVM_CONFIG) --link-static --libs >/dev/null 2>&1 && echo static),static)
# Cross compilation must use dynamic linking to avoid unresolved library
# dependencies. For native build, prefer linking statically if it's
# available, otherwise fallback to shared.
ifneq ($(ARCH), $(HOSTARCH))
LLVM_LINK_STATIC :=
else
LLVM_LINK_STATIC := $(shell $(LLVM_CONFIG) --link-static --libs >/dev/null 2>&1 && echo y)
endif
ifeq ($(LLVM_LINK_STATIC),y)
LLVM_LDLIBS += $(shell $(LLVM_CONFIG) --link-static --libs $(LLVM_CONFIG_LIB_COMPONENTS))
LLVM_LDLIBS += $(filter-out -lxml2,$(shell $(LLVM_CONFIG) --link-static --system-libs $(LLVM_CONFIG_LIB_COMPONENTS)))
LLVM_LDLIBS += -lstdc++