Does a pointer to function have a "Language Linkage"?

Does a pointer to function have a "Language Linkage"?

[Perry Smith]

The nut of this question: is

extern "C" void (*f)();

different from just

void (*f)();

?

It appears to me as if 7.5.8 says "yes" to this question -- they are  
different.

The details: The OS has timer facilities based in C and a C struct.   
The C struct has a pointer to function in it (a time pop routine).   
I've always assumed that this pointer to function must point to a  
function with C language linkage.  This sure becomes a pain though.

Thanks,
Perry

Re: Does a pointer to function have a "Language Linkage"?

[John Love-Jensen]

Hi Perry,

>Does a pointer to function have a "Language Linkage"?

I *THINK* (guessing) language linkage *CAN* affect three things:

1. name mangling
  "Do we prepend an underscore?
   Do we C++ mangle the name?
   Do we upper-case-ify?"

2. parameter order on stack
  "Are parameters pushed on left to right?
   Right to left?"

3. who cleans up the stack
  "Does the caller clean up the stack?
   Does the callee clean up the stack?"

For a function pointer, #1 is irrelevant.  #2 and #3 may be relevant,
depending on your platform.

I'm making a *GUESS* here, so I may be completely off base.

If I'm mistaken, I'd be happy to be corrected.

If I missed some, I'd be happy for those additional issues to be brought to
my attention.

HTH,
--Eljay