From 231fc9bc27fd03db171cab4e75116923250af7a7 Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Sat, 30 May 2026 18:07:50 -0700 Subject: [PATCH] bpftool: Restrict feature tests during bootstrap compilation 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 Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers Acked-by: Quentin Monnet Link: https://lore.kernel.org/r/20260531010750.525160-1-irogers@google.com Signed-off-by: Alexei Starovoitov --- tools/bpf/bpftool/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile index 0febf60e1b64..8f50bc163bb2 100644 --- a/tools/bpf/bpftool/Makefile +++ b/tools/bpf/bpftool/Makefile @@ -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