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 <[e-mail]>
Tested-by: Jiri Olsa <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andres Freund <[e-mail]>
Cc: Andrii Nakryiko <[e-mail]>
Cc: Christy Lee <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Quentin Monnet <[e-mail]>
Cc: Roberto Sassu <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

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

···
 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
···
 # run += make_install_info
 # 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