[PATCH 1/3] perf tools: Allow to specify libbpf install directory

Jiri Olsa
2019-11-27T09:49:03Z

Adding LIBBPF_DIR compile variable to allow linking with
libbpf installed into specific directory:

$ make -C tools/lib/bpf/ prefix=/tmp/libbpf/ install_lib install_headers
$ make -C tools/perf/ LIBBPF_DYNAMIC=1 LIBBPF_DIR=/tmp/libbpf/

It might be needed to clean build tree first because features
framework does not detect the change properly:

$ make -C tools/build/feature clean
$ make -C tools/perf/ clean

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Makefile.config | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index c90f4146e5a2..eb9d9b70b7d3 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -22,6 +22,14 @@ include $(srctree)/tools/scripts/Makefile.arch

$(call detected_var,SRCARCH)

+ifndef lib
+ ifeq ($(SRCARCH)$(IS_64_BIT), x861)
+ lib = lib64
+ else
+ lib = lib
+ endif
+endif # lib
+
NO_PERF_REGS := 1
NO_SYSCALL_TABLE := 1

@@ -484,11 +492,22 @@ ifndef NO_LIBELF
CFLAGS += -DHAVE_LIBBPF_SUPPORT
$(call detected,CONFIG_LIBBPF)

+ # for linking with debug library run:
+ # make DEBUG=1 LIBBPF_DIR=/opt/libbpf
+ ifdef LIBBPF_DIR
+ LIBBPF_CFLAGS := -I$(LIBBPF_DIR)/include
+ LIBBPF_LDFLAGS := -L$(LIBBPF_DIR)/$(lib)
+ FEATURE_CHECK_CFLAGS-libbpf := $(LIBBPF_CFLAGS)
+ FEATURE_CHECK_LDFLAGS-libbpf := $(LIBBPF_LDFLAGS)
+ endif
+
# detecting libbpf without LIBBPF_DYNAMIC, so make VF=1 shows libbpf detection status
$(call feature_check,libbpf)
ifdef LIBBPF_DYNAMIC
ifeq ($(feature-libbpf), 1)
EXTLIBS += -lbpf
+ CFLAGS += $(LIBBPF_CFLAGS)
+ LDFLAGS += $(LIBBPF_LDFLAGS)
else
dummy := $(error Error: No libbpf devel library found, please install libbpf-devel);
endif
@@ -1037,13 +1056,6 @@ else
sysconfdir = $(prefix)/etc
ETC_PERFCONFIG = etc/perfconfig
endif
-ifndef lib
-ifeq ($(SRCARCH)$(IS_64_BIT), x861)
-lib = lib64
-else
-lib = lib
-endif
-endif # lib
libdir = $(prefix)/$(lib)

# Shell quote (do not use $(call) to accommodate ancient setups);
@@ -1108,6 +1120,7 @@ ifeq ($(VF),1)
$(call print_var,LIBUNWIND_DIR)
$(call print_var,LIBDW_DIR)
$(call print_var,JDIR)
+ $(call print_var,LIBBPF_DIR)

ifeq ($(dwarf-post-unwind),1)
$(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
--
2.21.0