The title of the post is the question. I can see it is not assembly language ment for the NASM assembler. What assemlby language is gcc's assembly output ment for?
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Look up the difference between ["AT&T syntax" and "Intel syntax"](https://secure.wikimedia.org/wikipedia/en/wiki/X86_assembly_language#Syntax). – Greg Hewgill Nov 16 '11 at 00:47
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It's in AT&T syntax of the machine you're compiling on, while NASM uses Intel syntax.
-S -masm=intel will fix it: How do you use gcc to generate assembly code in Intel syntax?
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Mainly, two assembly flavors exists.
- Intel syntax
- AT&T (GAS) syntax
GCC usually outputs assembly using the AT&T (GAS) syntax, while NASM uses the Intel syntax.
On some platforms, you can generate assembly in Intel syntax using:
-masm=intel
Unfortunately, this is not supported everywhere. For instance, if using OS X, only the AT&T syntax is supported.
Macmade
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@ninjalj Right, but the NASM syntax is actually based on the Intel one. It's a kind of «simplified» Intel syntax. – Macmade Dec 06 '11 at 21:42
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You don't say exactly that in your answer, which makes your answer misleading. See http://stackoverflow.com/questions/8406188/does-gcc-really-know-how-to-output-nasm-assembly/8406725#8406725 – ninjalj Dec 06 '11 at 21:48
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Thank you... Are you actually trying to review all NASM related questions on StackOverflow to promote your own answer? – Macmade Dec 06 '11 at 21:50
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I actually wondered where the OP got the idea that NASM uses Intel Syntax, so I looked at his questions, and found it out. – ninjalj Dec 06 '11 at 21:53
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