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Re: How to support 64-bit PowerPC -mcmodel=medium?


On 12/08/17 01:15, Segher Boessenkool wrote:

On Fri, Aug 11, 2017 at 11:33:08AM +0200, Sebastian Huber wrote:
crtstuff.s: Assembler messages:
crtstuff.s:44: Error: can't resolve `.tm_clone_table' {.tm_clone_table
section} - `.LCTOC1' {.toc1 section}
crtstuff.s:45: Error: can't resolve `__TMC_END__' {*UND* section} -
`.LCTOC1' {.toc1 section}
Maybe you want to
#define USE_TM_CLONE_REGISTRY 0
for your subtarget?

I don't see what is the real problem causing your issues, but that
should allow you to get further at least.

I had to do this:

https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=251275

The main issue was that I didn't define RS6000_ABI_NAME, so SUBTARGET_OVERRIDE_OPTIONS() from sysv4.h selected ABI_V4. This triggered:

  if (flag_pic > 1 && DEFAULT_ABI == ABI_V4)      \
    {                                    \
      /* Note: flag_pic should not change any option flags that would    \
     be invalid with or pessimise -fno-PIC code.  LTO turns off    \
     flag_pic when linking/recompiling a fixed position executable. \
     However, if the objects were originally compiled with -fPIC,  \
     then other target options forced on here by -fPIC are restored \
     when recompiling those objects without -fPIC.  In particular  \
     TARGET_RELOCATABLE must not be enabled here by flag_pic.  */  \
      rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;            \
      TARGET_NO_FP_IN_TOC = 1;                        \
    }

The minimal TOC option apparently didn't work well for the crtbeginS.o.

With this patch I am now able to build RTEMS with the FreeBSD network stack utilizing > 4GiB of RAM on a T4240. Segher, thanks for your kind help. Without your help I would still struggle with the GCC configuration.

--
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber@embedded-brains.de
PGP     : Public key available on request.

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