linux-kernel - Re: [PATCH v2 1/6] perf: build: Setup PKG_CONFIG

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Date: Tue, 25 Jun 2024 18:08:30 +0100
From: Leo Yan <leo.yan@....com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
 Ian Rogers <irogers@...gle.com>, James Clark <james.clark@....com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>, Nick Terrell <terrelln@...com>,
 Thomas Richter <tmricht@...ux.ibm.com>, Quentin Monnet <qmo@...nel.org>,
 Changbin Du <changbin.du@...wei.com>, Fangrui Song <maskray@...gle.com>,
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 Guilherme Amadio <amadio@...too.org>
Subject: Re: [PATCH v2 1/6] perf: build: Setup PKG_CONFIG_LIBDIR for cross
 compilation


Hi Namhyung,

On 6/22/24 00:18, Namhyung Kim wrote:
> 
> Hello,
> 
> On Mon, Jun 10, 2024 at 10:54:28AM +0100, Leo Yan wrote:
>> On recent Linux distros like Ubuntu Noble and Debian Bookworm, the
>> 'pkg-config-aarch64-linux-gnu' package is missing. As a result, the
>> aarch64-linux-gnu-pkg-config command is not available, which causes
>> build failures.
>>
>> When a build passes the environment variables PKG_CONFIG_LIBDIR or
>> PKG_CONFIG_PATH, like a user uses make command or a build system
>> (like Yocto, Buildroot, etc) prepares the variables and passes to the
>> Perf's Makefile, the commit keeps these variables for package
>> configuration. Otherwise, this commit sets the PKG_CONFIG_LIBDIR
>> variable to use the Multiarch libs for the cross compilation.
>>
>> Signed-off-by: Leo Yan <leo.yan@....com>
>> ---
>>   tools/build/feature/Makefile | 26 +++++++++++++++++++++++++-
>>   tools/perf/Makefile.perf     | 26 +++++++++++++++++++++++++-
>>   2 files changed, 50 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
>> index ed54cef450f5..084f803093c3 100644
>> --- a/tools/build/feature/Makefile
>> +++ b/tools/build/feature/Makefile
>> @@ -82,7 +82,31 @@ FILES=                                          \
>>
>>   FILES := $(addprefix $(OUTPUT),$(FILES))
>>
>> -PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
>> +# Some distros provide the command $(CROSS_COMPILE)pkg-config for
>> +# searching packges installed with Multiarch. Use it for cross
>> +# compilation if it is existed.
>> +ifneq (, $(shell which $(CROSS_COMPILE)pkg-config))
>> +  PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
>> +else
>> +  PKG_CONFIG ?= pkg-config
>> +
>> +  # PKG_CONFIG_PATH or PKG_CONFIG_LIBDIR is required for the cross
>> +  # compilation. If both is not set, try to set the lib paths installed
>> +  # by multiarch.
>> +  ifdef CROSS_COMPILE
>> +    ifeq ($(PKG_CONFIG_LIBDIR)$(PKG_CONFIG_PATH),)
> 
> Maybe you want to check PKG_CONFIG_SYSROOT_DIR too.

IIRC, the manual says PKG_CONFIG_SYSROOT_DIR is used alongside
PKG_CONFIG_LIBDIR or PKG_CONFIG_PATH for prepending prefix for
the package paths.

I can add checking PKG_CONFIG_SYSROOT_DIR in the new patch set.

>> +      CROSS_ARCH = $(shell $(CC) -dumpmachine)
>> +      PKG_CONFIG_LIBDIR := /usr/local/$(CROSS_ARCH)/lib/pkgconfig/
>> +      PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/local/share/pkgconfig/
>> +      PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/local/lib/$(CROSS_ARCH)/pkgconfig/
>> +      PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/lib/$(CROSS_ARCH)/pkgconfig/
>> +      PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/share/pkgconfig/
> 
> I'm not sure why this ordering.. don't you want to check
> CROSS_ARCH directories first and then /usr/local/share and
> /usr/share directory?

I mainly refered to the script [1] which is an obselete package
('aarch64-linux-gnu-pkg-config') on old Debian/Ubuntu distros.

Your suggestion makes sense to me. I will change order as:

   PKG_CONFIG_LIBDIR := /usr/local/$(CROSS_ARCH)/lib/pkgconfig/
   PKG_CONFIG_LIBDIR := 
$(PKG_CONFIG_LIBDIR):/usr/local/lib/$(CROSS_ARCH)/pkgconfig/
   PKG_CONFIG_LIBDIR := 
$(PKG_CONFIG_LIBDIR):/usr/lib/$(CROSS_ARCH)/pkgconfig/
   PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/local/share/pkgconfig/
   PKG_CONFIG_LIBDIR := $(PKG_CONFIG_LIBDIR):/usr/share/pkgconfig/

Thanks,
Leo

[1] https://gist.github.com/doug65536/ea9c52f9a65a655a2fd5cc4997e8443b