[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <ecf3460a-7f31-4dce-9a8b-fde8f146bfd8@arm.com>
Date: Tue, 6 Aug 2024 22:00:55 +0100
From: Leo Yan <leo.yan@....com>
To: Yang Jihong <yangjihong@...edance.com>, peterz@...radead.org,
mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
irogers@...gle.com, adrian.hunter@...el.com, kan.liang@...ux.intel.com,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] perf: build: Fix static compilation error when
libdw is not installed
On 8/6/2024 12:47 PM, Yang Jihong wrote:
> If libdw is not installed in build environment, the output of
> 'pkg-config --modversion libdw' is empty, causing LIBDW_VERSION_2
> to be empty and the shell test will have the following error:
>
> /bin/sh: 1: test: -lt: unexpected operator
>
> Before:
>
> $ pkg-config --modversion libdw
> Package libdw was not found in the pkg-config search path.
> Perhaps you should add the directory containing `libdw.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'libdw' found
> $ make LDFLAGS=-static -j16
> BUILD: Doing 'make -j20' parallel build
> <SNIP>
> Package libdw was not found in the pkg-config search path.
> Perhaps you should add the directory containing `libdw.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'libdw' found
> /bin/sh: 1: test: -lt: unexpected operator
>
> After:
>
> 1. libdw is not installed:
>
> $ pkg-config --modversion libdw
> Package libdw was not found in the pkg-config search path.
> Perhaps you should add the directory containing `libdw.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'libdw' found
> $ make LDFLAGS=-static -j16
> BUILD: Doing 'make -j20' parallel build
> <SNIP>
> Package libdw was not found in the pkg-config search path.
> Perhaps you should add the directory containing `libdw.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'libdw' found
> Makefile.config:473: No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR
>
> 2. libdw version is lower than 0.177
>
> $ pkg-config --modversion libdw
> 0.176
> $ make LDFLAGS=-static -j16
> BUILD: Doing 'make -j20' parallel build
> <SNIP>
>
> Auto-detecting system features:
> ... dwarf: [ on ]
> <SNIP>
> INSTALL libsubcmd_headers
> INSTALL libapi_headers
> INSTALL libperf_headers
> INSTALL libsymbol_headers
> INSTALL libbpf_headers
> LINK perf
>
> 3. libdw version is higher than 0.177
>
> $ pkg-config --modversion libdw
> 0.186
> $ make LDFLAGS=-static -j16
> BUILD: Doing 'make -j20' parallel build
> <SNIP>
>
> Auto-detecting system features:
> ... dwarf: [ on ]
> <SNIP>
> CC util/bpf-utils.o
> CC util/pfm.o
> LD util/perf-util-in.o
> LD perf-util-in.o
> AR libperf-util.a
> LINK perf
>
> Fixes: 536661da6ea1 ("perf: build: Only link libebl.a for old libdw")
> Signed-off-by: Yang Jihong <yangjihong@...edance.com>
> ---
> tools/build/feature/Makefile | 2 +-
> tools/perf/Makefile.config | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index 12796808f07a..b18513ec4da6 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -178,7 +178,7 @@ ifeq ($(findstring -static,${LDFLAGS}),-static)
>
> # Elfutils merged libebl.a into libdw.a starting from version 0.177,
> # Link libebl.a only if libdw is older than this version.
> - ifeq ($(shell test $(LIBDW_VERSION_2) -lt 177; echo $$?),0)
> + ifeq ($(shell test $(LIBDW_VERSION_2)0 -lt 1770; echo $$?),0)
I would like to follow up the style of LIBTRACEEVENT_VERSION and
LIBTRACEFS_VERSION, so change LIBDW_VERSION as below:
LIBDW_VERSION := $(shell $(PKG_CONFIG) --modversion libdw).0.0
Does this work for you?
Thanks,
Leo
Powered by blists - more mailing lists