> -----Original Message----- > From: s...@google.com [mailto:s...@google.com] On Behalf Of Simon Glass > Sent: Tuesday, June 30, 2015 8:28 PM > To: Kushwaha Prabhakar-B32579 > Cc: Wood Scott-B07421; Sun York-R58495; tr...@konsulko.com; u- > b...@lists.denx.de; Dharmakan Rohit-B30502 > Subject: Re: [PATCH] powerpc/mpc85xx:Add GCC flag -fno-delete-null- > pointer-checks > > Hi, > > On 29 June 2015 at 22:18, Kushwaha Prabhakar <prabha...@freescale.com> > wrote: > > Hi Simon, Tom, > > > > -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. It is also well documented in the GCC v4.9 > release notes: > > https://gcc.gnu.org/gcc-4.9/porting_to.html > > > > There is possibility after moving to gcc-4.9 some platform may/may not > work properly. > > I tested this patch for freescale powerpc platforms. > > But It may needs be taken care by all architecture like ARM, powerpc. > > If this is the case; this flag should be in top level Makefile (not > > sure) > > > > I suspect a top-level option would be best, perhaps near this one in Makefile: > > KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) >
I agree to put it here. But how to test it against different platform supported by u-boot. --prabhakar _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
