Arm toolchain with gcc / newlib / VFP / hard float - can it be done?

[Joe Button]

On 26/02/13 08:39, Freddie Chopin wrote:
> In the build-toolchain.sh there's this line:
>
> MULTILIB_LIST="--with-multilib-list=armv6-m,armv7-m,armv7e-m,armv7-r"
>
> You'll need to add your arch to it (you may as well remove rest of 
> them if you don't need them). Then you should check how that 
> --with-multilib-list is implemented in GCC and add definition of your 
> arch where required - I think (but I'm not 100% sure) you'll only need 
> to provide multilib config for your arch in one of makefile fragments
Ok, I don't really know what I'm doing here, but I can see that 
gcc/config/arm/arm-cores.def has this:

ARM_CORE("arm1176jzf-s",  arm1176jzfs,  6ZK, FL_LDSCHED | FL_VFPV2, 9e)

and gcc/config/arm/arm-arches.def has this:

ARM_ARCH("armv6zk", arm1176jzs, 6ZK, FL_CO_PROC | FL_FOR_ARCH6ZK)

Which leads me to think perhaps all I need to do is stick "armv6zk" in 
my MULTILIB_LIST. Does that sound even slightly plausible?

By the way I'm still not sure how this is going to solve the problem of 
newlib getting built without the hardfloat abi - my gcc can already 
build with hardfloat, it's just newlib that doesn't seem to end up with it.

Thanks,

Joe