Makefile:Add GCC flag -fno-delete-null-pointer-checks

-fdelete-null-pointer-checks flag controls global dataflow analyses and
eliminate useless checks for null pointers; It assume that if a pointer is
checked after it has already been dereferenced, it cannot be null.
This flag is enabled by default.

gcc v4.9 has more optimizations added to this option. Hence it is very
aggressive with GCC v4.9 series. Add -fno-delete-null-pointer-checks to
disable the optimization

Signed-off-by: Rohit Dharmakan <rohitarulraj@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>

diff --git a/Makefile b/Makefile
index 85052fe7d64209d4211f932299bc2fb732b12cfa..3ad6ff5f363dd579f01f8d8a94eab7fcb446ea22 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -565,6 +565,7 @@ KBUILD_CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
 endif
 
 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
+KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks)
 
 KBUILD_CFLAGS  += -g
 # $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>