Hi,
If you use a cross build system (yocto,...), you may want to use CC value from 
build environnement.

Ronan Le Martret [iot.bzh]

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>From fb28a28f8498c15176992a700ceb83776f8370de Mon Sep 17 00:00:00 2001
From: Ronan <[email protected]>
Date: Thu, 3 Nov 2016 16:55:38 +0100
Subject: [PATCH] allow used of CC from build environnement

 * If you use a cross build system (yocto,...)
   you may want to use CC value from build environnement.

Signed-off-by: Ronan <[email protected]>
---
 tools/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/Makefile b/tools/Makefile
index 9b6e176..657384a 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -10,7 +10,7 @@
 # the COPYING file in the top-level directory.
 #
 
-CC = $(CROSS_COMPILE)gcc
+CC ?= $(CROSS_COMPILE)gcc
 
 CFLAGS = -g -O3 -I../driver -DLIBEXECDIR=\"$(libexecdir)\" \
 	-Wall -Wextra -Wmissing-declarations -Wmissing-prototypes -Werror \
-- 
2.6.6

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