-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 --- Changes for v2: move to top level file
Makefile | 1 + 1 file changed, 1 insertion(+)
diff --git a/Makefile b/Makefile index 37cc4c3..0dc6c53 100644 --- 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>