When linking statically, libraries may require other dependencies to be
included to ld flags. In particular, libelf may require libzstd. Use
pkg-config to determine such dependencies.
Signed-off-by: Akihiko Odaki <akihiko.od...@daynix.com>
---
V1 -> V2: Implemented fallback, referring to HOSTPKG_CONFIG.
tools/testing/selftests/bpf/Makefile | 3 ++-
tools/testing/selftests/bpf/README.rst | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile
b/tools/testing/selftests/bpf/Makefile
index caede9b574cb..4b947040d6d4 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -4,6 +4,7 @@ include ../../../scripts/Makefile.arch
include ../../../scripts/Makefile.include
CXX ?= $(CROSS_COMPILE)g++
+PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
CURDIR := $(abspath .)
TOOLSDIR := $(abspath ../../..)
@@ -31,7 +32,7 @@ CFLAGS += -g -O0 -rdynamic -Wall -Werror $(GENFLAGS)
$(SAN_CFLAGS) \
-I$(CURDIR) -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
-I$(TOOLSINCDIR) -I$(APIDIR) -I$(OUTPUT)
LDFLAGS += $(SAN_LDFLAGS)
-LDLIBS += -lelf -lz -lrt -lpthread
+LDLIBS += $(shell $(PKG_CONFIG) --libs libelf zlib || -lelf -lz) -lrt -lpthread
ifneq ($(LLVM),)
# Silence some warnings when compiled with clang
diff --git a/tools/testing/selftests/bpf/README.rst
b/tools/testing/selftests/bpf/README.rst
index cb9b95702ac6..9af79c7a9b58 100644
--- a/tools/testing/selftests/bpf/README.rst
+++ b/tools/testing/selftests/bpf/README.rst
@@ -77,7 +77,7 @@ In case of linker errors when running selftests, try using
static linking:
.. code-block:: console
- $ LDLIBS=-static vmtest.sh
+ $ LDLIBS=-static PKG_CONFIG='pkg-config --static' vmtest.sh
.. note:: Some distros may not support static linking.
--
2.42.0
