macho and underscores on global function names

[Mike Frysinger]

On Friday 16 March 2007, Mark Charney wrote:
> On mac, yasm needs to name a function "_foo" so that it can be called  as
> "foo()" from C.
>                global _foo
> _foo:
>          ...

i'd point out that this issue has been around for quite a long time and no 
other assembler has felt the need to implement to handle these details

it's really quite trivial to macro away the differences:
%ifidfn __OUTPUT_FORMAT__,macho
%define FUNC(x) _ %+ x
%else
%define FUNC(x) x
%endif
...
FUNC(foo):
...

plus, you cant focus on just the _ prefix ... gcc makes no such requirement 
and it's up to each individual port to declare the actual ABI prefix:
#define USER_LABEL_PREFIX "<whatever you want>"

>           (1) use ifdef's in the c program that calls it, (kinda ugly)

higher level languages should never have such ABI details encoded in them

>           (2) double-label everything, with and without underscores, or
>           (3) preprocess my .s file before assemlbing it to add the
> underscores as required.

the above preprocessor logic should cover all of this
-mike
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