Building uclibc for big-endian and little-endian target.

[Sedat Dilek]

On Wed, Oct 16, 2013 at 5:23 PM, Mike Frysinger <vapier at gentoo.org> wrote:
> On Wednesday 16 October 2013 04:23:17 Sedat Dilek wrote:
>> On Wed, Oct 16, 2013 at 9:04 AM, Mike Frysinger wrote:
>> > On Tuesday 15 October 2013 15:00:40 Khem Raj wrote:
>> >> On Oct 15, 2013, at 10:30 AM, Steve Ellcey wrote:
>> >> > I have a question about endiness and uclibc.  I am trying to build
>> >> > multiple versions of uclibc for MIPS, including big and little endian
>> >> > versions.  What I notice is that in Rules.mak there are lines:
>> >> >
>> >> > CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
>> >> > CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
>> >> >
>> >> > to add -EL or -EB to linker commands (this seems to be generic for all
>> >> > architectures).
>> >> >
>> >> > What I do not see is any generic (or MIPS specific) code to add -EL or
>> >> > -EB to CPU_CFLAGS (or CPU_FLAGS-y to be exact).  I am wondering if
>> >> > there is a specific reason for this?  Right now the uclibc build
>> >> > seems to assume that the compiler I am using to build uclibc will
>> >> > always generate the correct endiness without any flags.
>> >>
>> >> That was consensus we had some time ago. Otherwise these flags were
>> >> getting too many and difficult to deal with.
>> >
>> > well, i think that was more focused on cpu/arch/tune flags.  we still
>> > have endian flags in there for various targets.  adding the right logic
>> > for mips would be OK imo.
>>
>> As the Freetz router project had to deal with BE/LE issues, we (yes, I
>> was more active these days) decided to define the Kconfig logic in:
>>
>>      extra/Configs/Config.mips
>>
>> ...and added the the CPU_FLAGS-* (CPU optimization etc.) stuff to...
>>
>>      Rules.mak
>>
>> Please see the patch in [1] for more details.
>
> that patch is exactly the sort of thing we are not adding more support for

Hi Mike,

what had you in mind, how would you realize it?

Regards,
- Sedat -