tools build: Pass libbpf feature only if libbpf 1.0+

libbpf 1.0 represented a cleanup and stabilization of APIs. Simplify
development by only passing the feature test if libbpf 1.0 is installed.

Committer notes:

Change 'make -C tools/perf build-test' so that the LIBBPF_DYNAMIC=1 test
runs only if libbpf is >= 1.0.
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Christy Lee <christylee@fb.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Roberto Sassu <roberto.sassu@huawei.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230116010115.490713-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/build/feature/test-libbpf.c

 // SPDX-License-Identifier: GPL-2.0
 #include <bpf/libbpf.h>
 
+#if !defined(LIBBPF_MAJOR_VERSION) || (LIBBPF_MAJOR_VERSION < 1)
+#error At least libbpf 1.0 is required for Linux tools.
+#endif
+
 int main(void)
 {
 	return bpf_object__open("test") ? 0 : -1;

tools/perf/tests/make

@@ -150,7 +150,6 @@ run += make_no_libaudit
 run += make_no_libbionic
 run += make_no_auxtrace
 run += make_no_libbpf
-run += make_libbpf_dynamic
 run += make_no_libbpf_DEBUG
 run += make_no_libcrypto
 run += make_no_sdt
@@ -176,6 +175,12 @@ run += make_install_prefix_slash
 # run += make_install_pdf
 run += make_minimal
 
+old_libbpf := $(shell echo "#include <bpf/libbpf.h>" | $(CC) -E -dM -x c -| egrep -q "define[[:space:]]+LIBBPF_MAJOR_VERSION[[:space:]]+0{1}")
+
+ifneq ($(old_libbpf),)
+run += make_libbpf_dynamic
+endif
+
 ifneq ($(call has,ctags),)
 run += make_tags
 endif