Re: 64 bit codes

[Georg Bauhaus <rm.dash-bauhaus@futureapps.de>]

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.