external relocation entries in non-writable section? (SOLVED)

[Rick Mann]

Mostly solved. See below.

Anders F Björklund Wrote:

> Rick Mann wrote:
> > struct __CFString {};
> > typedef const __CFString*				CFStringRef;
> > 
> > extern (C)
> > CFStringRef
> > __CFStringMakeConstantString(char* cStr);
> > 
> Maybe it has something to do with that extra "const" ? What is that ?
> (looks to me like it is trying to use the keyword like it was in C++)

This is how the C header had it defined. In particular, CFStringRef is supposed to point to an immutable CFString, and (not defined here) CFMutableStringRef points to a mutable one (in the C header it drops the "const").

I'm not sure how const works in D, although I know that you can't specify function parameters as const. I assume the "in" qualifier does the same thing, but I'm not sure (I've been able to write code that modifies unqualified parameters inside the function).

Ideally, I'd get a compile-time error if I passed a CFStringRef as a parameter that expected a CFMutableStringRef.

> Although when I tried it, it still worked OK even with the "const"...
> 
> struct __CFString { } // opaque
> typedef const __CFString* CFStringRef;
> 
> extern(C) CFStringRef __CFStringMakeConstantString(char *cStr);
> alias __CFStringMakeConstantString CFSTR; // only for string literals
> 
> 
> Then using it something like:
> 
>      err = CreateNibReference(CFSTR("main"), &nibRef);
>      if (err != noErr) goto CantGetNibRef;
> 
> So I'm not sure what else your code is doing differently than mine ?

I'm not either. I wrote a sample program defining everything in one file, and it worked fine. I also moved the defs to a separate file, and it still worked fine (with the "const" in there). I called CFShow() to output the value of the constructed CFStringRef, and it worked great. I can't figure out what's going on...hmm. I just went to reproduce the error, and now it seems to be working...?

Ah! In the same file that defines __CFStringMakeConstantString, I define this (lexically before __CFStringMakeConstantString):

CFStringRef
CFSTR(char[] inString)
{
	return __CFStringMakeConstantString(inString.ptr);
}

If I move it to after __CFStringMakeConstantString(), then it works okay.