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Asked: 2026-05-14T04:39:36+00:00

How can I detect at compile time from an ASM source file if the

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How can I detect at compile time from an ASM source file if the target architecture is I386 or AMD64?

I am using masm(ml.exe)/masm64(ml64.exe) to assemble file32.asm and file64.asm. It would be nice to create a single file, file.asm, which should include either file32.asm, or file64.asm, depending on the architecture. Ideally, I would like to be able to write something like:

IFDEF amd64
include file64.asm
ELSE
include file32.asm
ENDIF

Also, if needed, I can run ml.exe and ml64.exe with different command line options.

Thanks!

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1 Answer

  1. Editorial Team

    If I understand you correctly, you’re looking for some sort of built-in define that has a different value among 32 and 64 bit MASM versions. I once looked for something like that, but didn’t find anything suitable.

    However, it’s easy enough to just define your own, e.g. AMD64 equ 1 at the start of your source file to select your desired code path, or at the ML/ML64 command-line, like /DAMD64. And then use IFDEF/IFNDEF, as you suggest.

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