Re: powerpc gcc option -many passed to assembler

["Titus von Boxberg" <titus at v9g dot de>]

Hi,

just in case someone is interested:
Calling as with option -many is hardcoded in gcc.

A colleague found those links which might be helpful
for seeing the "reasoning" behind:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21091
http://gcc.gnu.org/ml/gcc-patches/2004-05/msg01244.html
http://gcc.gnu.org/ml/gcc-patches/2004-05/msg01247.html
http://sources.redhat.com/ml/binutils/2004-05/msg00376.html
http://sources.redhat.com/ml/binutils/2004-05/msg00357.html

The problem I had was that the compiler/assemler accepts
e.g. dcbzl for an e500v2 which leads to a SIGILL.

The solution for me is up to now
- to patch away -many in gcc
- to allow sync / eieio (in addition to equivalent msync/mbar) in as
  for e500 because otherwise you cannot compile almost nothing
  of the tool chain.

Aditionally, in binutils 2.20 there is the mistake that
an e500 was believed to be an e500mc (but this has apparently
been corrected in 2.21).

Regards
Titus

Am Di, 22.03.2011, 14:49 schrieb Titus von Boxberg:
> Hi,
>
> I'm using ct-ng generated tool chains (gcc 4.5.1, binutils 2.20)
> for PowerPCs, a 603e and a e500v2.
>
> Both compilers pass -many to the assembler which disables
> checking the assembly code for cpu specific instructions
> (or better, for instructions the cpu does NOT provide).
>
> Does someone know what the reasoning is and if there's
> some knob to turn it off?




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