From: Prabhakar Kushwaha <prabhakar@freescale.com>
Date: Thu, 2 Jul 2015 06:30:17 +0000 (+0530)
Subject: Makefile:Add GCC flag -fno-delete-null-pointer-checks
X-Git-Tag: v2015.07~18
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=687a7518a1b1e40e005711603dcb14e0f6942d6d;p=oweals%2Fu-boot.git

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 37cc4c3fa4..0dc6c53fcf 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>