From ad1237c30d975535a669746496cbed136aa5a045 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Sat, 8 May 2021 22:50:20 +0200 Subject: [PATCH] perf tools: Fix dynamic libbpf link Justin reported broken build with LIBBPF_DYNAMIC=1. When linking libbpf dynamically we need to use perf's hashmap object, because it's not exported in libbpf.so (only in libbpf.a). Following build is now passing: $ make LIBBPF_DYNAMIC=1 BUILD: Doing 'make -j8' parallel build ... $ ldd perf | grep libbpf libbpf.so.0 => /lib64/libbpf.so.0 (0x00007fa7630db000) Fixes: eee19501926d ("perf tools: Grab a copy of libbpf's hashmap") Reported-by: Justin M. Forbes Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Ian Rogers Cc: Mark Rutland Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/20210508205020.617984-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Makefile.config | 1 + tools/perf/util/Build | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 0d66190..406a951 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -540,6 +540,7 @@ ifndef NO_LIBELF ifdef LIBBPF_DYNAMIC ifeq ($(feature-libbpf), 1) EXTLIBS += -lbpf + $(call detected,CONFIG_LIBBPF_DYNAMIC) else dummy := $(error Error: No libbpf devel library found, please install libbpf-devel); endif diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 8c0d9f3..b64bdc1 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -145,7 +145,14 @@ perf-$(CONFIG_LIBELF) += symbol-elf.o perf-$(CONFIG_LIBELF) += probe-file.o perf-$(CONFIG_LIBELF) += probe-event.o +ifdef CONFIG_LIBBPF_DYNAMIC + hashmap := 1 +endif ifndef CONFIG_LIBBPF + hashmap := 1 +endif + +ifdef hashmap perf-y += hashmap.o endif -- 2.7.4