config.mk: Make cc-option create a file under include/generated

Testing for -fstack-usage requires the creation of an output file, which
isn't possible with /dev/null.

Signed-off-by: Tom Rini <trini@ti.com>

diff --git a/config.mk b/config.mk
index ddaa4775cd972a55623b6c783ce9b82f7b969d6e..596ba935926f6e2eb76b16ea280391012c24eacf 100644 (file)
--- a/config.mk
+++ b/config.mk
@@ -108,13 +108,12 @@ HOSTCFLAGS        += -pedantic
 # only supported compiler options are used
 #
 CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
-
-$(if $(wildcard $(CC_OPTIONS_CACHE_FILE)),,\
-       $(shell mkdir -p $(dir $(CC_OPTIONS_CACHE_FILE))))
+CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
 
 -include $(CC_OPTIONS_CACHE_FILE)
 
-cc-option-sys = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
+cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
+               if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
                > /dev/null 2>&1; then \
                echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
                echo "$(1)"; fi)