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Re: sorry, unimplemented: 64-bit mode not compiled in - ?!
> On Thu, Jul 27, 2006 at 12:56:14PM +0200, Denis Vlasenko wrote:
> > does it mean I need a cross-compiler (to x86_64) to use -m64?
> > It's strange because then -m64 is not useful at all
> > - x86_64 cross compiler defaults to 64 bit anyway... right?
>
> It overrides -m32 earlier on the command line. It's also possible to
> build 32-bit configurations which support 64-bit compilation - but
> the default i686-linux configuration does not. The i686-solaris2.10
> port does, and Debian's i486-linux compilers do also (local patch).
Interesting, the major reason for disabling -m64 by default for 32bit
compilers was the fact that it enforces HOST_WIDE_INT to be 64bit
slowing down the whole compiler considerably. Are Debian's folks happy
to wait longer for compilation or has this overhead changed?
Honza
>
> --
> Daniel Jacobowitz
> CodeSourcery