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Asked: 2026-05-23T17:34:21+00:00

I would like to be able to compare the asm generated by visual studio

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I would like to be able to compare the asm generated by visual studio and gcc for a particular function. For the sake of argument, lets say that we already know this function exists in both binaries.

What i would like to do is simply run a script that will extract the desired function disassembled (asm) from both binaries. I know how to examine the asm in Visual Studio and gdb respectivly, but i’m a little stumped how to do this in any kind of scriptable manner.

Any ideas or theories would help. Thanks!

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  1. Editorial Team

    Both compilers support a command line option which causes it to leave the generated assembly language as the result of compilation, instead of an object file. With MSVC, use /Fa[file] (and generates the .obj too—tested with VS2008). With gcc, the -S command line option leaves assembly output.

    While using the option can be done in the Visual Studio IDE, it seems like a scripted comparison would use a batch file, or other script command line interpreter to compile the files, extract the proper portion with sed or whatever, and then do whatever comparison is needed.

    gcc -S x.c       (generates x.S)
cl  /Fa  x.c     (generates x.asm and x.obj)
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