• Domingo Alvarez Duarte (27/27) Jul 27 2014 Hello !
• bearophile (7/15) Jul 28 2014 I guess you are using different versions of the front-end.
• Domingo Alvarez Duarte (3/19) Jul 28 2014 Thanks ! You are right I'm using dmd 2.066 and gdc 4.8/4.9,

"Domingo Alvarez Duarte" <mingodad gmail.com> writes:

Hello !

Based on a question about manually allocated structures with 
payload I found that a solution proposed seems to work when 
compiled with dmd but segfaults when compiled with gdc.

So my question is: Is this a bug on dmd, gdc or a bad idiom ?

---- code to see the problem
import std.stdio;
import core.stdc.stdlib;

void main()
{
	struct S
	{
		int size;
		char[0] _b;
		 property char[] buf() { return (_b.ptr)[0..size];}
	}
	
	int size = 12;
	S *s = cast(S*)malloc(S.sizeof + size);
	if(s !is null)
	{
		scope(exit) free(s);
		s.size = size;
		s.buf[0] = 'a';
		writeln(s.buf[0]);
	}
}

"bearophile" <bearophileHUGS lycos.com> writes:

Domingo Alvarez Duarte:

 Based on a question about manually allocated structures with 
 payload I found that a solution proposed seems to work when 
 compiled with dmd but segfaults when compiled with gdc.
 ...
 		int size;
 		char[0] _b;
 		 property char[] buf() { return (_b.ptr)[0..size];}
 	}

I guess you are using different versions of the front-end. 
Zero-length arrays was null before, and it's not null in V. 2.066.

So probably there is no bug, just a little design change for the 
better.

Bye,
bearophile

"Domingo Alvarez Duarte" <mingodad gmail.com> writes:

On Monday, 28 July 2014 at 08:16:37 UTC, bearophile wrote:
 Domingo Alvarez Duarte:

 Based on a question about manually allocated structures with 
 payload I found that a solution proposed seems to work when 
 compiled with dmd but segfaults when compiled with gdc.
 ...
 		int size;
 		char[0] _b;
 		 property char[] buf() { return (_b.ptr)[0..size];}
 	}

 I guess you are using different versions of the front-end. 
 Zero-length arrays was null before, and it's not null in V. 
 2.066.

 So probably there is no bug, just a little design change for 
 the better.

 Bye,
 bearophile

Thanks ! You are right I'm using dmd 2.066 and gdc 4.8/4.9, 
Cheers !