Re: Arm and big endian

[Ian Lance Taylor <ian@wasabisystems.com>]

Pierre Habraken <Pierre.Habraken@imag.fr> writes:

> I want to compile gcc and newlib so that big endian code is generated
> for newlib (this is for teaching purpose).
> 
> Though I understand that multilib is activated by default, I do not need
> the multilib option since I want 32 bits and big endian code only.
> 
> The configure doc. (in INSTALL dir.) says that there is an option for
> disabling biendian (BTW, does here "bi" mean "big" or "bi-" ?...), but
> nothing for enabling it.
> 
> I tried --enable-biendian : configure does not complain about it but
> apparently does not take it in account.
> 
> So my question is : What configure option I have to set up for gcc in
> order to get newlib being cross-compiled to big endian code ?
> 
> Has someone succeeded in doing that (with or without multilib support) ?

I don't think there is any way to do that without patching the source.

It's easy to patch the source to make -mbig-endian the default: change
the definition of TARGET_DEFAULT to include ARM_FLAG_BIG_END.
TARGET_DEFAULT is defined in config/arm/*.h; the exact definition
depends upon your target.

It is only slightly more work to add support for --with-endian to
config.gcc.

Ian