64 bit

Phoenix2206 · 01-04-2005, 01:30 PM

If I compile a program under a 64 bit OS and compiler, is the program 64 bit?

leadazide · 01-04-2005, 01:56 PM

I think yes, if you're not cross-compiling.

aluser · 01-04-2005, 02:31 PM

I would guess that it's 64 bit iff sizeof(void*) is 8. That should be a quick way to check : )

jlliagre · 01-04-2005, 03:31 PM

That depend on the compiler you are using, if it only supports 32 bits, it will obviously only generate 32 bits binaries.
If you are using a recent compiler, it will generate 64 bits code on a 64 platform, unless you specify -m32 (or equivalent) on the command line.
Reciprocally, you should be able to compile 64 bit code on a 32 bit O/S with the -m64 option.

Use the "file" command on a binary or a library to see whether its 32 or 64 bits.