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Hello i have this annoying error in my code
start.asm(443) : error: coff: invalid relocation size
this error only occurs when I assemble the code using the win64 format
but this is required as i am using a windows 64bit Linker

the code in question is

_res is declared in my c++ code as
and _portid is declared as (the value varies)

line 443 is in the above asm code

thanks for any help

Perhaps the 64-bit version of coff does not support 16 bit relocations? My guess is its trying to output something like 66 ba 00 00 (i.e. mov dx, imm16) and then point the relocation to the 16-bit field (because what you're actually asking for is an address). If you want the actual value of the portid variable, try mov dx, [_portid], which should produce an opcode using modrm and a 32-bit offset (and therefore should assemble fine).

Regards,
John.

thank you for your help!