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

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Date: Tue,  4 Jun 2024 10:32:18 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...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
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v1 1/6] perf: build: Setup PKG_CONFIG_LIBDIR for cross compilation

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
+    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