[U-Boot] [PATCH v2 2/6] config.mk: Make cc-option create a file under include/generated

[Tom Rini]

Testing for -fstack-usage requires the creation of an output file, which
isnt possible with /dev/null.

Signed-off-by: Tom Rini <trini at ti.com>
---
 config.mk |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/config.mk b/config.mk
index ddaa477..519bc1b 100644
--- a/config.mk
+++ b/config.mk
@@ -108,14 +108,14 @@ 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_FILE := $(OBJTREE)/include/generated/cc_test_file.c
 
 -include $(CC_OPTIONS_CACHE_FILE)
 
-cc-option-sys = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
-		> /dev/null 2>&1; then \
+cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_FILE)); \
+		touch $(CC_TEST_FILE); \
+		if $(CC) $(CFLAGS) $(1) -S -o $(CC_TEST_FILE) \
+		-xc $(CC_TEST_FILE) > /dev/null 2>&1; then \
 		echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
 		echo "$(1)"; fi)
 
-- 
1.7.0.4