linux-kernel - Re: [PATCH v2 3/6] tools: Make pkg-config dependency checks usable by other tools

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Message-ID: <ZoSP_vFMVl83pxES@google.com>
Date: Tue, 2 Jul 2024 16:40:46 -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>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] tools: Make pkg-config dependency checks usable
 by other tools

+CC Steve and linux-trace-kernel list.

Thanks,
Namhyung

On Fri, Jun 28, 2024 at 10:34:29PM +0200, Guilherme Amadio wrote:
> Other tools, in tools/verification and tools/tracing, make use of
> libtraceevent and libtracefs as dependencies. This allows setting
> up the feature check flags for them as well.
> 
> Signed-off-by: Guilherme Amadio <amadio@...too.org>
> ---
>  tools/build/Makefile.feature | 20 ++++++++++++++++++++
>  tools/perf/Makefile.config   | 10 ----------
>  2 files changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index 1e2ab148d5db..79a03e034073 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -149,6 +149,26 @@ FEATURE_DISPLAY ?=              \
>  #
>  FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
>  
> +#
> +# Declare list of feature dependency packages that provide pkg-config files.
> +#
> +FEATURE_PKG_CONFIG ?=           \
> +         libtraceevent          \
> +         libtracefs
> +
> +feature_pkg_config = $(eval $(feature_pkg_config_code))
> +define feature_pkg_config_code
> +  ifeq ($(shell $(PKG_CONFIG) --exists $(1) 2>&1 1>/dev/null; echo $$?),0)
> +    FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1))
> +    FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1))
> +  endif
> +endef
> +
> +# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
> +ifneq ($(PKG_CONFIG),)
> +  $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
> +endif
> +
>  # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
>  # If in the future we need per-feature checks/flags for features not
>  # mentioned in this list we need to refactor this ;-).
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index ba51ecfca02b..23f2b54d8ee6 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -187,16 +187,6 @@ ifneq ($(NO_LIBTRACEEVENT),1)
>    dummy := $(error Error: $(PKG_CONFIG) needed by libtraceevent is missing on this system, please install it)
>    endif
>  endif
> -ifeq ($(shell $(PKG_CONFIG) --exists libtraceevent 2>&1 1>/dev/null; echo $$?),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 $(PKG_CONFIG) --libs libtracefs)
> -endif
>  
>  FEATURE_CHECK_CFLAGS-bpf = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(SRCARCH)/include/uapi -I$(srctree)/tools/include/uapi
>  # include ARCH specific config
> -- 
> 2.45.2
>