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(as.info)i386-Options

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Options
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   The i386 version of `as' has a few machine dependent options:

`--32 | --64'
     Select the word size, either 32 bits or 64 bits. Selecting 32-bit
     implies Intel i386 architecture, while 64-bit implies AMD x86-64
     architecture.

     These options are only available with the ELF object file format,
     and require that the necessary BFD support has been included (on a
     32-bit platform you have to add -enable-64-bit-bfd to configure
     enable 64-bit usage and use x86-64 as target platform).