Re: Can not build flat shared library.

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

Gary, All,

On Monday 14 March 2011 22:52:21 Gary Altenberg wrote:
> I am attempting to build a tool chain for an ARM (no mmu arm7tdmi) to 
> build applications for a uClinux board. I read that I should use a 
> shared library so I set my "Target File Format" in uClibc to Shared 
> FLAT. It says in the help for Shared FLAT to "Pick this one if you are 
> using uClinux and wish to build uClibc as a flat-format shared library". 
> Are there options in gcc to pick this also? I didn't see any.

I believe we do not currently have proper support for flat binaries.
You should have a look at:
  scripts/build/kernel/linux.sh
in function CT_DoKernelTupleValues:

  CT_DoKernelTupleValues() {
      if [ "${CT_ARCH_USE_MMU}" = "y" ]; then
          CT_TARGET_KERNEL="linux"
      else
      # Sometime, noMMU linux targets have a -uclinux tuple, while
      # sometime it's -linux. We currently have only one noMMU linux
      # target, and it uses -linux, so let's just use that. Time
      # to fix that later...
      #    CT_TARGET_KERNEL="uclinux"
          CT_TARGET_KERNEL="linux"
      fi
  }

So in your case, I guess you'd want a tuple that ends with -uclinux instead
of -linux. Care to test that (override in the script)? If it works, then it
will be time to review that function and be a bit more inventive there.

Also, in the binutils sub-menu, you will have to choose one of:
- 'Flat' and a version of elf2flt,
- 'FD_PIC ELF'

Note: AFAICR, the "only one noMMU linux target" referred-to in the linux
kernel script, above, is blackfin.

Regards,
Yann E. MORIN.

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