[PATCH] Makefile: Fix empty flag results for stackprotector _AUTO mode

[Kees Cook <keescook@chromium.org>]

If the compiler didn't support any stackprotector mode, the second
empty test would still trip. This moves it to an "else" test for the
non-AUTO modes.

Reported-and-tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
This is a separate fix from the issue with gcc 4.4.4. Yay compilers.
(Also, this is technically a v2 with just the commit message changed.)
---
 Makefile | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 20fafb48fdf9..74d5f037df69 100644
--- a/Makefile
+++ b/Makefile
@@ -1093,16 +1093,17 @@ PHONY += prepare-compiler-check
 prepare-compiler-check: FORCE
 # Make sure compiler supports requested stack protector flag.
 ifdef stackp-name
-  # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
   ifeq ($(stackp-flag),)
+	# Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
 	@echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
 		  Compiler does not support any known stack-protector >&2
-  endif
-  # Fail if specifically requested stack protector is missing.
+  else
   ifeq ($(call cc-option, $(stackp-flag)),)
+	# Fail if specifically requested stack protector is missing.
 	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
 		  $(stackp-flag) not supported by compiler >&2 && exit 1
   endif
+  endif
 endif
 # Make sure compiler does not have buggy stack-protector support.
 ifdef stackp-check
-- 
2.7.4


-- 
Kees Cook
Pixel Security