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Message-ID: <ZoSOR0ULxXLxLZvA@google.com>
Date: Tue, 2 Jul 2024 16:33:27 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Guilherme Amadio <amadio@...too.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Thorsten Leemhuis <linux@...mhuis.info>, Leo Yan <leo.yan@....com>,
linux-perf-users@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/6] perf build: Conditionally add feature check flags
for libtrace{event,fs}
Hello,
On Fri, Jun 28, 2024 at 10:34:27PM +0200, Guilherme Amadio wrote:
> This avoids reported warnings when the packages are not installed.
>
> Fixes: 0f0e1f44569061e3dc590cd0b8cb74d8fd53706b
> Signed-off-by: Guilherme Amadio <amadio@...too.org>
Thanks for working on this.
> ---
> tools/perf/Makefile.config | 28 +++++++++++++++-------------
> 1 file changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 5271a4c1d2b3..5387babb8f04 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -182,13 +182,21 @@ endif
> FEATURE_CHECK_CFLAGS-libzstd := $(LIBZSTD_CFLAGS)
> FEATURE_CHECK_LDFLAGS-libzstd := $(LIBZSTD_LDFLAGS)
>
> -# for linking with debug library, run like:
> -# make DEBUG=1 PKG_CONFIG_PATH=/opt/libtraceevent/(lib|lib64)/pkgconfig
> -FEATURE_CHECK_CFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --cflags libtraceevent)
> -FEATURE_CHECK_LDFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --libs libtraceevent)
> -
> -FEATURE_CHECK_CFLAGS-libtracefs := $(shell $(PKG_CONFIG) --cflags libtracefs)
> -FEATURE_CHECK_LDFLAGS-libtracefs := $(shell $(PKG_CONFIG) --libs libtracefs)
> +ifneq ($(NO_LIBTRACEEVENT),1)
> + ifeq ($(call get-executable,$(PKG_CONFIG)),)
> + dummy := $(error Error: $(PKG_CONFIG) needed by libtraceevent is missing on this system, please install it)
I know you just copied the code, but IIRC we wanted to remove this dummy
assignment before.
> + endif
> +endif
> +ifeq ($(shell $(PKG_CONFIG) --exists libtraceevent 2>&1 1>/dev/null; echo $$?),0)
> + # for linking with debug library, run like:
> + # make DEBUG=1 PKG_CONFIG_PATH=/opt/libtraceevent/(lib|lib64)/pkgconfig
> + FEATURE_CHECK_CFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --cflags libtraceevent)
> + FEATURE_CHECK_LDFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --libs libtraceevent)
> +endif
> +ifeq ($(shell $(PKG_CONFIG) --exists libtracefs 2>&1 1>/dev/null; echo $$?),0)
> + FEATURE_CHECK_CFLAGS-libtracefs := $(shell $(PKG_CONFIG) --cflags libtracefs)
> + FEATURE_CHECK_LDFLAGS-libtracefs := $(shell $(PKG_CONFIG) --libs libtracefs)
I'm curious if we can redirect stderr to /dev/null to surpress the
output when pkg-config is not installed. Then we don't need to check
the `ifeq`.
Thanks,
Namhyung
> +endif
>
> FEATURE_CHECK_CFLAGS-bpf = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(SRCARCH)/include/uapi -I$(srctree)/tools/include/uapi
> # include ARCH specific config
> @@ -208,12 +216,6 @@ ifeq ($(call get-executable,$(BISON)),)
> $(error Error: $(BISON) is missing on this system, please install it)
> endif
>
> -ifneq ($(NO_LIBTRACEEVENT),1)
> - ifeq ($(call get-executable,$(PKG_CONFIG)),)
> - dummy := $(error Error: $(PKG_CONFIG) needed by libtraceevent is missing on this system, please install it)
> - endif
> -endif
> -
> ifneq ($(OUTPUT),)
> ifeq ($(shell expr $(shell $(BISON) --version | grep bison | sed -e 's/.\+ \([0-9]\+\).\([0-9]\+\).\([0-9]\+\)/\1\2\3/g') \>\= 371), 1)
> BISON_FILE_PREFIX_MAP := --file-prefix-map=$(OUTPUT)=
> --
> 2.45.2
>
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