CODEWITHSUNDEEP
macosassembly
Dabrorius
Dabrorius

Reputation: 1039

Unknown pseudo-op: .global

I'm trying to compile a simple operating system code we got on OS class. It works fine under Ubuntu but I'd like to compile it on OS X. The error I get is:

[compiling] arch/i386/arch/startup.S ...
arch/i386/arch/startup.S:8:Unknown pseudo-op: .extern
arch/i386/arch/startup.S:8:Rest of line ignored. 1st junk character valued 107 (k).
arch/i386/arch/startup.S:11:Expected comma after segment-name
arch/i386/arch/startup.S:13:Unknown pseudo-op: .global
arch/i386/arch/startup.S:13:Rest of line ignored. 1st junk character valued 97 (a).

This is the source code of that file, and here is the makefile

So if anyone have an idea what to do I would appreciate it :)

Upvotes: 4

Views: 5709

Answers (2)

kevin
kevin

Reputation: 827

I think it should be ".globl" not ".global"

Upvotes: 1

jleahy
jleahy

Reputation: 16895

As you're compiling using OS/X you'll be using X-Code's ancient version of as. This means you'll have to put up with some slightly older syntax. This other answer covers some of these problems.

At very least you're going to need to replace .global with .globl. You can remove .extern as all symbols are treated as external by default. For the section definition you should consult the gas manual; I believe the assembler is asking you to define the section flags.

Upvotes: 5

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