Building gcc-3.0 cross sompiler

[David Korn]

>-----Original Message-----
>From: Mike Pelley [ mailto:mike@pelley.com ]
>Sent: 03 August 2001 14:23
>To: crossgcc@sources.redhat.com
>Subject: RE: Building gcc-3.0 cross sompiler
>
>
>Mike,
>I don't know what address is the GCC help.
>Please forward my question.
>
>Appreciated,
>Ronen.
>
>
>Hi,
>
>I am using the GCC compiler to compile/link a program for embedded target
>running PowerPC in LITTLE ENDIAN mode.
>
>I chose the following in the makefile : 
>
>-mcpu=powerpcle-*-eabi   (which I understand is the suitable for embedded
>PowerPC in little endian mode).

   Nope, that is wrong: what you have there is the generic 'target triple'
for a little-endian ppc compiler.  You would use this when building the
compiler itself to specify what kind of target you want the compiler to
produce code for.  When *using* (not building) the compiler, you tell it
which particular ppc cpu to use with an option like "-mcpu=604" or
"-mcpu=750".  The Gcc manual mentions it in the section "GNU CC Command
Options : Hardware Models and Configurations : IBM RS/6000 and PowerPC
Options"

-------snip!-------
" -mcpu=cpu_type 
Set architecture type, register usage, choice of mnemonics, and instruction
scheduling parameters for machine type cpu_type. Supported values for
cpu_type are `rs6000', `rios1', `rios2', `rsc', `601', `602', `603', `603e',
`604', `620', `power', `power2', `powerpc', `403', `505', `821', and `860'
and `common'. "
-------snip!-------

>DEFAULT_RULE   = vxWorks

  You do realise that vxWorks doesn't support little-endian mode for the
ppc, don't you ?  So your BSPs and vxworks OS libs will not work on a ppc
in little-endian mode, even though you can generate code for it with the
compiler ?  You should browse through appendix F in the "VxWorks Programmers
Guide" for further information, in particular part F.2 which tells you how
to use the gcc flags for Vxworks and part F.5 which give vxworks-ppc
architectural information.

        DaveK
-- 
"Computer games don't affect kids; I mean if Pac-Man affected us as kids,
we'd all be running around in darkened rooms, munching magic pills and
listening to repetitive electronic music."
    - Kristian Wilson, Nintendo, Inc, 1989.


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