many libgcc in MacOS X 10.4 build

[Mike Stump]

On Oct 13, 2005, at 8:21 PM, Jack Howarth wrote:
>    What exactly are all of the new libgcc versions created when  
> building
> the current gcc cvs on MacOS X 10.4.

They allow targeting different OS versions with one compiler, from  
the doc:

@item -mmacosx-version-min=@var{version}
The earliest version of MacOS X that this executable will run on
is @var{version}.  Typical values of @var{version} include @code{10.1},
@code{10.2}, and @code{10.3.9}.

The default for this option is to make choices that seem to be most
useful.

The ppc64 one is for 64-bit code...