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Re: sorry, unimplemented: 64-bit mode not compiled in - ?!


On 7/28/06, Jan Hubicka <hubicka@ucw.cz> wrote:
> 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?

It also uses more memory due to this change.


Richard.


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