Re: 64 bit codes

[Mok-Kong Shen <mok-kong.shen@t-online.de>]

Am 27.09.2011 15:25, schrieb Georg Bauhaus:
> On 27.09.11 15:09, Ludovic Brenta wrote:
>
>> No, there is more to it than that.  Given that most of GNAT is written
>> in Ada, one requires a 64-bit Ada compiler to produce the first 64-bit
>> Ada compiler;
>
> This will make the compiler itself be 64bit executables;
> If I just want a compiler to produce 64bit executables,
> any compiler will do:
>
> $ arch
> i386
> $ file $(which gcc-4.0)
> /usr/bin/gcc-4.0: Mach-O universal binary with 2 architectures
> /usr/bin/gcc-4.0 (for architecture i386):	Mach-O executable i386
> /usr/bin/gcc-4.0 (for architecture ppc7400):	Mach-O executable ppc
> $ gcc-4.0 -m64 foo.c
> $ file a.out
> a.out: Mach-O 64-bit executable x86_64
> $ ./a.out
> -bash: ./a.out: Bad CPU type in executable
>
> A 64bit compiler is not needed, just as none needs to run on a JVM
> in order to produce Java byte code.
> OTOH, I understand that the GNAT front end interact with the GCC
> internals in non-trivial ways.

I tried the option -m64 on the gcc that is included in the ADA package,
but failed.

M. K. Shen