On Tue, 30 Jan 2007, Atsushi Nemoto wrote:
> > Well, the option used to select between 64-bit and 32-bit ELF for
> > building 64-bit configurations. I can see it has been changed from its
> > original meaning and it now only controls whether "-mno-explicit-relocs"
> > is passed to the compiler or not, which is sort of useless and certainly
> > does not match the intent nor what the description says. The 64-bit
> > format is now used unconditionally and you can always pass such obscure
> > options to the compiler on the make's command line, so instead of this fix
> > I vote for complete removal of the BUILD_ELF64 option.
> Though I do not know much about -mno-explicit-relocs,
> CONFIG_BUILD_ELF64 controls -msym32 option and this is the reason of
> the tweak in __pa_page_offset().
I missed this bit, sorry. Then the original note applies -- the setting
of BUILD_ELF64 is whatever suits one building the kernel the best. And
certainly for binaries built to run from CKSEG0 either value of
BUILD_ELF64 is reasonable.