• Austin Hastings <ah08010-d yahoo.com> Jan 29 2011
• Adam D. Ruppe <destructionator gmail.com> Jan 29 2011
• Austin Hastings <ah08010-d yahoo.com> Jan 29 2011

Austin Hastings <ah08010-d yahoo.com> writes:

Howdy,

I'm jammed up against a variation of the issue#3745/3770 AA linkage problem.

In my case, I'm using an int[ string ] AA, and I'm getting the dreaded 
Error 42: Symbol Undefined 
_D6object28__T16AssociativeArrayTAyaTiZ16AssociativeArray4keysMFNdZAAya

My code looks something like:

class gc_enum : subscriber
{
	int[ string ] gc_label_index;

	// ...

	void assign_gc_enum_vals( )
	{
		sorted_labels = gc_label_index.keys;
		sorted_labels.sort;
			
		// ...
	}


Looking in the rtl sources, I don't see that function in aaA.d. Maybe 
it's in a different file, or maybe the compiler is supposed to magically 
rewrite those accesses into something totally different.

I've been trying to get all my code into a single file, as that seems to 
be a work-around, but I'm wondering if there are other ways to work 
around this problem?

Thanks,

=Austin

Adam D. Ruppe <destructionator gmail.com> writes:

Shooting in the dark here (I can't reproduce the error for
whatever reason), but for similar problems, I've found this fixes
it:

Add a function somewhere in your file that says:

void hackAroundBug() {
      writeln(typeid(int[string]));
}

You never actually need to call it. Just putting it there gives
the compiler that extra nudge to put the symbol back into the
object file.


The error I saw was related to .rehash being missing, but it
fixed it for me and might work here too.


My older method was to add

-I/home/me/d/dmd2/src/druntime/src /home/me/d/dmd2/src/druntime/src/object_.d -d

On to the DMD command line (object_.d has the code needed for
various AA things). Of course remember to fix the paths there
to your dmd source.

But with the referencing typeinfo workaround, I haven't needed
to do this at all anymore.

Austin Hastings <ah08010-d yahoo.com> writes:

The hackAroundBug()/typeid approach didn't work for me - I still got the 
error 42. Presently, I'm using a local method, but this is annoying for 
obvious reasons:

	string[] aa_keys( int[ string ] aa )
	{
		return aa.keys;
	}

Even more annoying is that this works, while a simple reference to the 
member.keys in the calling method doesn't. I wonder if this is caused by 
the AA being inside an object?

=Austin


On 1/29/2011 11:17 AM, Adam D. Ruppe wrote:
 Shooting in the dark here (I can't reproduce the error for
 whatever reason), but for similar problems, I've found this fixes
 it:

 Add a function somewhere in your file that says:

 void hackAroundBug() {
        writeln(typeid(int[string]));
 }

 You never actually need to call it. Just putting it there gives
 the compiler that extra nudge to put the symbol back into the
 object file.


 The error I saw was related to .rehash being missing, but it
 fixed it for me and might work here too.


 My older method was to add

 -I/home/me/d/dmd2/src/druntime/src /home/me/d/dmd2/src/druntime/src/object_.d
-d

 On to the DMD command line (object_.d has the code needed for
 various AA things). Of course remember to fix the paths there
 to your dmd source.

 But with the referencing typeinfo workaround, I haven't needed
 to do this at all anymore.