linux-kernel - [PATCH] pm: cpupower: Makefile: Fix cross compilation

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Message-Id: <20241129012006.3068626-1-peng.fan@oss.nxp.com>
Date: Fri, 29 Nov 2024 09:20:05 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Thomas Renninger <trenn@...e.com>,
	Shuah Khan <shuah@...nel.org>,
	"John B. Wyatt IV" <jwyatt@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	Peng Fan <peng.fan@....com>,
	linux-pm@...r.kernel.org (open list:CPU POWER MONITORING SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list)
Cc: Florian Fainelli <florian.fainelli@...adcom.com>
Subject: [PATCH] pm: cpupower: Makefile: Fix cross compilation

From: Peng Fan <peng.fan@....com>

After commit f79473ed9220 ("pm: cpupower: Makefile: Allow overriding
cross-compiling env params") we would fail to cross compile cpupower in
buildroot which uses the recipe at [1] where only the CROSS variable is
being set.

The issue here is the use of the lazy evaluation for all variables: CC,
LD, AR, STRIP, RANLIB, rather than just CROSS.

[1]:
https://git.buildroot.net/buildroot/tree/package/linux-tools/linux-tool-cpupower.mk.in

Fixes: f79473ed9220 ("pm: cpupower: Makefile: Allow overriding cross-compiling env params")
Reported-by: Florian Fainelli <florian.fainelli@...adcom.com>
Closes: https://lore.kernel.org/all/2bbabd2c-24ef-493c-a199-594e5dada3da@broadcom.com/
Signed-off-by: Peng Fan <peng.fan@....com>
---
 tools/power/cpupower/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index 175004ce44b2..51a95239fe06 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -87,11 +87,19 @@ INSTALL_SCRIPT = ${INSTALL} -m 644
 # to something more interesting, like "arm-linux-".  If you want
 # to compile vs uClibc, that can be done here as well.
 CROSS ?= #/usr/i386-linux-uclibc/usr/bin/i386-uclibc-
+ifneq ($(CROSS), )
+CC = $(CROSS)gcc
+LD = $(CROSS)gcc
+AR = $(CROSS)ar
+STRIP = $(CROSS)strip
+RANLIB = $(CROSS)ranlib
+else
 CC ?= $(CROSS)gcc
 LD ?= $(CROSS)gcc
 AR ?= $(CROSS)ar
 STRIP ?= $(CROSS)strip
 RANLIB ?= $(CROSS)ranlib
+endif
 HOSTCC = gcc
 MKDIR = mkdir
 
-- 
2.34.1