[klibc] [PATCH] klibc: introduce EXTRA_KLIBCWARNFLAGS variable

[Maciej Żenczykowski]

From: Maciej Żenczykowski <maze at google.com>

Introduce new EXTRA_KLIBCWARNFLAGS variable which is appended to
the compiler warning flags.

This can be used to enable compiler warning promotion with:
  make EXTRA_KLIBCWARNFLAGS=-Werror
(and/or to disable individual warnings)

Signed-off-by: Maciej Żenczykowski <maze at google.com>
---
 scripts/Kbuild.klibc |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/Kbuild.klibc b/scripts/Kbuild.klibc
index f500d5358ef6..e913c5c9a4a9 100644
--- a/scripts/Kbuild.klibc
+++ b/scripts/Kbuild.klibc
@@ -70,7 +70,8 @@ KLIBCREQFLAGS     := $(call cc-option, -fno-stack-protector, ) \
                      $(call cc-option, -fwrapv, )
 KLIBCARCHREQFLAGS :=
 KLIBCOPTFLAGS     :=
-KLIBCWARNFLAGS    := -W -Wall -Wno-sign-compare -Wno-unused-parameter
+KLIBCWARNFLAGS    := -W -Wall -Wno-sign-compare -Wno-unused-parameter \
+        $(EXTRA_KLIBCWARNFLAGS)
 KLIBCSHAREDFLAGS  :=
 KLIBCBITSIZE      :=
 KLIBCLDFLAGS      :=
-- 
1.7.9.4