🚀 go-pugleaf

MW Ron wrote:
> 
> In article <3D19F129.B549F3E0@arc-software.com>,
>  Paul Russell <prussell@arc-software.com> wrote:
> 
> >I'm trying to integrate a chunk of gcc PowerPC assembler code into a CW
> >8 Mach-O project. I've tried two approaches, neither of which seem to
> >work. Has anyone else had more success than I have ?
> >
> >(i) fix the syntax (by hand !) and put the code into an inline asm {}
> >function - this fails because CW complains that there aren't enough free
> >registers (despite teh fact that I'm only using about 12 GPR's)
> >
> >(ii) assemble with gcc and try to link in the object file - the Mach-O
> >Importer barfs with an error about an unsupported relocation type or
> >some such
> >
> >Surely it shouldn't be this hard to link is some very straightforward
> >asm functions, that already work with gcc ?
> 
> What linker are you using? the Apple GCC linker or Metrowerks Mach-O
> linker,  do you have a small example project (or code for a stationery
> project) that you can send that I can forward on.
> 

I think I now have the solution to this. To keep the Mach-O Importer
happy you need at least one .globl directive in the source code. In
order to link with C code, your function names (labels) need to have a
preceding underscore. So, a minimal asm function would be:

//
// foo.S
//
// void foo(void);
//

.globl _foo
_foo:
    nop
    blr

//

Paul