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bpftool: Restrict feature tests during bootstrap compilation

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When the perf build executes 'make -C ../bpf/bpftool bootstrap', bpftool's
Makefile unconditionally evaluated feature checks for llvm, libcap, libbfd,
and disassembler libraries because the bootstrap target was not exempted.

Since the bootstrap bpftool strictly compiles minimal AST parsing and C
code generation logic without linking LLVM or disassembler libraries, these
feature check sub-makes are completely redundant.

Exempt the bootstrap target from non-essential feature tests to eliminate
unneeded sub-make fork overhead during Kbuild startup.

Tested-by: James Clark <james.clark@linaro.org>
Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/r/20260531010750.525160-1-irogers@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ian Rogers 2026-05-30 18:07:50 -07:00 committed by Alexei Starovoitov
parent aa22d619ba
commit 231fc9bc27
1 changed files with 5 additions and 0 deletions
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5
tools/bpf/bpftool/Makefile
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@ -106,6 +106,10 @@ ifneq ($(SKIP_CRYPTO),1)
CRYPTO_LIBS := -lcrypto
endif
ifeq ($(MAKECMDGOALS),bootstrap)
FEATURE_TESTS := libelf-zstd
FEATURE_DISPLAY :=
else
FEATURE_TESTS := clang-bpf-co-re
FEATURE_TESTS += llvm
FEATURE_TESTS += libcap
@ -122,6 +126,7 @@ FEATURE_DISPLAY += libcap
FEATURE_DISPLAY += libbfd
FEATURE_DISPLAY += libbfd-liberty
FEATURE_DISPLAY += libbfd-liberty-z
endif
check_feat := 1
NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall