We imported cc-option but forgot to import cc-disable-warning.
Fixes: b556a992c3ad ("btrfs-progs: build: allow to build with various compiler warnings")
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
Makefile.extrawarn | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Makefile.extrawarn b/Makefile.extrawarn
index 1f4bda94a167..18a3a860053e 100644
--- a/Makefile.extrawarn
+++ b/Makefile.extrawarn
@@ -19,6 +19,12 @@ try-run = $(shell set -e; \
cc-option = $(call try-run,\
$(CC) $(CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
+# cc-disable-warning
+# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
+cc-disable-warning = $(call try-run,\
+ $(CC) -Werror $(CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
+
+
# From linux.git/scripts/Makefile.extrawarn
# ==========================================================================
#
--
2.19.2
