linux-kernel - [PATCH 1/3] tools: lib: thermal: use pkg-config to locate libnl3

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Message-Id: <20251001-libthermal-install-v1-1-3071fd3f6612@pengutronix.de>
Date: Wed, 01 Oct 2025 13:40:55 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>, 
 Lukasz Luba <lukasz.luba@....com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 1/3] tools: lib: thermal: use pkg-config to locate libnl3

To make libthermal more cross compile friendly use pkg-config to locate
libnl3. Only if that fails fall back to hardcoded /usr/include/libnl3.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 tools/lib/thermal/Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/lib/thermal/Makefile b/tools/lib/thermal/Makefile
index a1f5e388644d31d36f973d3ddce48d036ee0a083..fdde0c4f85b4e511a16c43810590ed45b007a5ad 100644
--- a/tools/lib/thermal/Makefile
+++ b/tools/lib/thermal/Makefile
@@ -46,8 +46,12 @@ else
   CFLAGS := -g -Wall
 endif

+NL3_CFLAGS = $(shell pkg-config --cflags libnl-3.0 2>/dev/null)
+ifeq ($(NL3_CFLAGS),)
+NL3_CFLAGS = -I/usr/include/libnl3
+endif
+
 INCLUDES = \
--I/usr/include/libnl3 \
 -I$(srctree)/tools/lib/thermal/include \
 -I$(srctree)/tools/lib/ \
 -I$(srctree)/tools/include \
@@ -59,6 +63,7 @@ INCLUDES = \
 override CFLAGS += $(EXTRA_WARNINGS)
 override CFLAGS += -Werror -Wall
 override CFLAGS += -fPIC
+override CFLAGS += $(NL3_CFLAGS)
 override CFLAGS += $(INCLUDES)
 override CFLAGS += -fvisibility=hidden
 override CFGLAS += -Wl,-L.

-- 
2.47.3