linux-kernel - Re: [PATCH v1 1/6] perf: build: Setup PKG_CONFIG

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Message-ID: <ZmHx2EFK9cSWgUIK@google.com>
Date: Thu, 6 Jun 2024 10:28:56 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Leo Yan <leo.yan@....com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	James Clark <james.clark@....com>, Ian Rogers <irogers@...gle.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Nick Terrell <terrelln@...com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Changbin Du <changbin.du@...wei.com>,
	Fangrui Song <maskray@...gle.com>,
	Mateusz Kowalczyk <fuuzetsu@...zetsu.co.uk>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1 1/6] perf: build: Setup PKG_CONFIG_LIBDIR for cross
 compilation

Hi Leo,

On Tue, Jun 04, 2024 at 10:32:18AM +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.
> 
> Alternatively, this commit sets the PKG_CONFIG_LIBDIR environment
> variable dynamically based on the cross compiler to ensure the correct
> package configurations.
> 
> Signed-off-by: Leo Yan <leo.yan@....com>
> ---
>  tools/build/feature/Makefile | 14 +++++++++++++-
>  tools/perf/Makefile.perf     | 15 ++++++++++++++-
>  2 files changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index ed54cef450f5..6f52f892f9a3 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -82,7 +82,19 @@ FILES=                                          \
>  
>  FILES := $(addprefix $(OUTPUT),$(FILES))
>  
> -PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
> +PKG_CONFIG ?= pkg-config
> +
> +ifdef CROSS_COMPILE
> +  ifndef PKG_CONFIG_LIBDIR

Can we do that only if the cross-compile-pkg-config is not available?

Thanks,
Namhyung


> +    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/
> +    export PKG_CONFIG_LIBDIR
> +  endif
> +endif
>  
>  all: $(FILES)
>  
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 5c35c0d89306..c1553a546a4f 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -193,7 +193,20 @@ HOSTLD  ?= ld
>  HOSTAR  ?= ar
>  CLANG   ?= clang
>  
> -PKG_CONFIG = $(CROSS_COMPILE)pkg-config
> +PKG_CONFIG ?= pkg-config
> +
> +# Set the PKG_CONFIG_LIBDIR for cross compilation.
> +ifdef CROSS_COMPILE
> +  ifndef PKG_CONFIG_LIBDIR
> +    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/
> +    export PKG_CONFIG_LIBDIR
> +  endif
> +endif
>  
>  RM      = rm -f
>  LN      = ln -f
> -- 
> 2.34.1
>