move cc-option definition to rules.mak

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/rules.mak b/rules.mak
index 8d6d96e5b1..f9d0ca09e3 100644
--- a/rules.mak
+++ b/rules.mak
@@ -17,3 +17,9 @@ LINK = $(call quiet-command,$(CC) $(LDFLAGS) -o $@ $(1) $(ARLIBS_BEGIN) $(ARLIBS
 	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"  AR    $(TARGET_DIR)$@")
 
 quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
+
+# cc-option
+# Usage: CFLAGS+=$(call cc-option, $(CFLAGS), -falign-functions=0, -malign-functions=0)
+
+cc-option = $(shell if $(CC) $(1) $(2) -S -o /dev/null -xc /dev/null \
+              > /dev/null 2>&1; then echo "$(2)"; else echo "$(3)"; fi ;)