From: Daniel Borkmann <daniel@iogearbox.net>
To: Akihiko Odaki <akihiko.odaki@daynix.com>
Cc: Andrii Nakryiko <andrii@kernel.org>,
Mykola Lysenko <mykolal@fb.com>,
Alexei Starovoitov <ast@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
Nick Terrell <terrelln@fb.com>,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next] selftests/bpf: Use pkg-config to determine ld flags
Date: Mon, 16 Oct 2023 13:39:13 +0200 [thread overview]
Message-ID: <062d9a75-caa0-d05d-14db-cd59dafab8b9@iogearbox.net> (raw)
In-Reply-To: <20231015133916.257197-1-akihiko.odaki@daynix.com>
On 10/15/23 3:39 PM, Akihiko Odaki wrote:
> 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.
Is this not covered via -lz or is it that the name differs?
Anyway, this change breaks selftest build for BPF CI (see below), could this
either be made optional or detected differently?
https://github.com/kernel-patches/bpf/actions/runs/6524480596/job/17716170021
[...]
make: pkg-config: Command not found
CC bench.o
make: pkg-config: Command not found
make: pkg-config: Command not found
CC bench_count.o
make: pkg-config: Command not found
BINARY xdp_redirect_multi
HOSTLD /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/fixdep-in.o
LINK /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/fixdep
CC veristat.o
INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd//include/subcmd/exec-cmd.h
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/exec-cmd.o
make: pkg-config: Command not found
INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd//include/subcmd/help.h
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/help.o
INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd//include/subcmd/pager.h
make: pkg-config: Command not found
BINARY test_verifier
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/pager.o
BINARY test_tag
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/parse-options.o
make: pkg-config: Command not found
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/run-command.o
INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd//include/subcmd/parse-options.h
make: pkg-config: Command not found
INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd//include/subcmd/run-command.h
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/sigchain.o
BINARY flow_dissector_load
CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/libsubcmd/subcmd-config.o
make: pkg-config: Command not found
BINARY test_lirc_mode2_user
INSTALL libsubcmd_headers
BINARY xdping
make: pkg-config: Command not found
> 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..833134aa2eda 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 $(PKG_CONFIG) --libs libelf zlib) -lrt -lpthread
>
> ifneq ($(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.
>
>
next prev parent reply other threads:[~2023-10-16 11:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-15 13:39 [PATCH bpf-next] selftests/bpf: Use pkg-config to determine ld flags Akihiko Odaki
2023-10-15 13:39 ` Akihiko Odaki
2023-10-16 11:39 ` Daniel Borkmann [this message]
2023-10-16 11:57 ` Akihiko Odaki
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