[tip:perf/urgent] tools gpio: Allow overriding CFLAGS

[tip-bot for Jiri Olsa]

Commit-ID:  4ccc98a48958da9f89beb71c66a4e05468727951
Gitweb:     https://git.kernel.org/tip/4ccc98a48958da9f89beb71c66a4e05468727951
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Wed, 12 Dec 2018 11:25:37 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 28 Dec 2018 16:33:08 -0300

tools gpio: Allow overriding CFLAGS

So that the user can specify outside CFLAGS values.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Hartmut Knaack <knaack.h@xxxxxx> <knaack.h@xxxxxx>
Cc: Herton Krzesinski <herton@xxxxxxxxxx>
Cc: Jonathan Cameron <jic23@xxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20181212102537.25902-7-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/gpio/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/gpio/Makefile b/tools/gpio/Makefile
index 240eda014b37..6ecdd1067826 100644
--- a/tools/gpio/Makefile
+++ b/tools/gpio/Makefile
@@ -12,7 +12,7 @@ endif
 # (this improves performance and avoids hard-to-debug behaviour);
 MAKEFLAGS += -r
 
-CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
+override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
 
 ALL_TARGETS := lsgpio gpio-hammer gpio-event-mon
 ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))