On Tue, Jun 30, 2015 at 08:58:26AM -0600, Simon Glass wrote: > Hi, > > On 29 June 2015 at 22:18, Kushwaha Prabhakar <[email protected]> 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 also agree with Scott and Simon, default, top level, using cc-option just like the Linux kernel please, thanks! -- Tom
signature.asc
Description: Digital signature
_______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
