exporting nasm code as win64 causes it to add extra junk

[CalebKeatts]

I have created a custom bootloader and created the kernel in c++ following the osdev wiki. When I try to compile the assembly with

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nasm.exe -f win64 boot.asm -o boot.obj

, compile the kernel.cpp to kernel.obj, and link it with

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~\tdm-gcc64\c++.exe -T linker.ld -o Boot.img -ffreestanding -nostdlib boot.obj kernel.obj

it will have extra "This program cannot be run in DOS mode" I also don't know how to set it to start at 0x7c00 as

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org 0x7c00

doesn't work unless in binary format. Any help will be appreciated.

[Octocontrabass]

You're using a compiler targeted towards Windows, so it creates Windows EXE files by default. Does your linker script tell it you want a flat binary?

I strongly recommend using a cross-compiler. It's much easier to get help with your compiler when you're using the same compiler that everyone else is using.