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

Mike Frysinger vapier at gentoo.org
Wed Oct 16 15:23:28 UTC 2013


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
-mike
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