Re: Cross compilation

[Kai Ruottu <karuottu at mbnet dot fi>]

Mahoney, David M. kirjoitti:
> Hello,
>
> How do I configure GCC to use the PowerPC backend? I'm running Linux on
> PC (Intel Architecture) and I want GCC to generate a PowerPC executable
> in ELF format.
>   
The "ELF" is object format like "COFF" (SVR3.2) and "PE" 
(WinNT4.0/PPC). It is not a target
system for which to create an executable !  Possible target systems 
which use ELF as their object
format, are Linux/PPC, FreeBSD/PPC, NetBSD/PPC and those 'powerpc-eabi*' 
embedded
targets....  So, what is your "target" ?

Via the 'http://www.ocdemon.com' it was possible to find a prebuilt 
'powerpc-eabi' targeted
crosstoolchain for the Linux/x86 host system.  Maybe there are also 
prebuilt downloadable tools
for Linux/x86-to-Linux/PPC too.

Generally building a cross-GCC should be much easier than producing a 
native GCC when only
one build stage is required, not any wacky "three-stage bootstrap", as 
usually happens with a
native GCC build. But unfortunately it isn't because at least one 
workaround is required because
of a bug/feature which has been there in the GCC sources the last 10 
years :-(   I'm meaning the
GCC build, of course the target binutils and the target C library (taken 
from the target system, if
that is a "system") must pre-exist, the binutils been built and the C 
library be copied...

If the goal is to generate PowerPC "code" in symbolic assembly format, 
neither binutils, nor the
C library for the target is required. Producing objects requires an 
assembler for the target and
producing executables requires a linker and the target C library, 
including the startups....


> Thank,
>
> Dave Mahoney
> Northrop Grumman ES
> Software Engineer
>
> Phone: 410.993.9008
> Email: david.mahoney@ngc.com
>
>
>
>