aix gcc question

[Robert A Nesius]

On Thu, 24 Jan 2002, David Edelsohn wrote:

> >>>>> Robert Nesius writes:

> [paraphrasing]
> | Why not build GCC as a 64-bit application on 64-bit AIX systems?
>
> 	GCC might be installed in a common location used on both 32-bit
> and 64-bit AIX systems.

I'm aware of those concerns.

> And, until GCC 3.1 development, the PowerPC port
> of GCC would not function correctly in a 64-bit hosted environment.

It's not clear to me why that would be.  Is it because the
PowerPC port itself won't be complete until 3.1?

> 	The GCC option to compile and link in 64-bit mode is -maix64.

Interesting.  I didn't ask for a 64-bit build, but there were
a ton of instances of this argument in my build log.  I would
think that if I didn't tell gcc to build 64-bit, it wouldn't
generate any 64-bit objects at all.

<pdxfs32 161> /tmp/gcc/aix43-gcc303 # ggrep -- '-maix64' bootstrap.out | wc -l
    1400

Is it the case that if the gcc build detects 64-bit hardware,
it builds some pieces of gcc 32-bit and 64-bit?

> 	If one wants to pass an option to just the first stage of the GCC
> bootstrap process, one may define the STAGE1_CFLAGS variable when invoking
> Make.

Thanks for that hint.  I've always wondered how to prevent
the build from passing incompatible vendor flags to the second
and third stages.

-Rob


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Robert Nesius             rnesius@ichips.intel.com    503.712.2181
DPG Engineering Computing SW Applications Team