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bpftool: Allow explicitly skip llvm, libbfd and libcrypto dependencies

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Introduce SKIP_LLVM, SKIP_LIBBFD, and SKIP_CRYPTO build flags that let
users build bpftool without these optional dependencies.

SKIP_LLVM=1 skips LLVM even when detected. SKIP_LIBBFD=1 prevents the
libbfd JIT disassembly fallback when LLVM is absent. Together, they
produce a bpftool with no disassembly support.

SKIP_CRYPTO=1 excludes sign.c and removes the -lcrypto link dependency.
Inline stubs in main.h return errors with a clear message if signing
functions are called at runtime.

Use BPFTOOL_WITHOUT_CRYPTO (not HAVE_LIBCRYPTO_SUPPORT) as the C
define, following the BPFTOOL_WITHOUT_SKELETONS naming convention for
bpftool-internal build config, leaving HAVE_LIBCRYPTO_SUPPORT free for
proper feature detection in the future.

All three flags are propagated through the selftests Makefile to bpftool
sub-builds.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260312-b4-bpftool_build-v2-1-4c9d57133644@meta.com
This commit is contained in:
Mykyta Yatsenko
2026-03-12 17:03:27 -07:00
committed by Andrii Nakryiko
parent 6c8e1a9eee
commit c73a244366
4 changed files with 55 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
tools/testing/selftests/bpf/Makefile
View File

@@ -41,6 +41,8 @@ LIBELF_LIBS := $(shell $(PKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
SKIP_DOCS ?=
SKIP_LLVM ?=
SKIP_LIBBFD ?=
SKIP_CRYPTO ?=
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
@@ -333,6 +335,9 @@ $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \
LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \
LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/ \
SKIP_LLVM=$(SKIP_LLVM) \
SKIP_LIBBFD=$(SKIP_LIBBFD) \
SKIP_CRYPTO=$(SKIP_CRYPTO) \
prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
ifneq ($(CROSS_COMPILE),)
@@ -345,6 +350,9 @@ $(CROSS_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
OUTPUT=$(BUILD_DIR)/bpftool/ \
LIBBPF_OUTPUT=$(BUILD_DIR)/libbpf/ \
LIBBPF_DESTDIR=$(SCRATCH_DIR)/ \
SKIP_LLVM=$(SKIP_LLVM) \
SKIP_LIBBFD=$(SKIP_LIBBFD) \
SKIP_CRYPTO=$(SKIP_CRYPTO) \
prefix= DESTDIR=$(SCRATCH_DIR)/ install-bin
endif