Using D as a shared library.

[Paolo & Kevin]

I am trying to use a D shared library with a C program.
But I have a problem, the code works in a D program.
But it crashes as a library.

Here is a minimal example.
I want to make a library that returns an array of 100 integers.
% ls
fakemain.d  function.d  main.c
% cat fakemain.d
void main() {}
% cat function.d
extern (C) {
int* blah() {
     int[] a;
     a.length = 100;
     return a.ptr; } }
% cat main.c
int* blah();
int main() {
     int* p;
     p = blah();
     p[0] = 1;
     return p[0];}
%

Lets compile everything:
% dmd -fPIC -c fakemain.d
% dmd -fPIC -c function.d
% gcc -c main.c
% ls
fakemain.d  fakemain.o  function.d  function.o  main.c  main.o

Lets link, fakemain.o is needed to avoid linking problems:
% gcc -fPIC -shared -o libfunction.so function.o
% gcc -L"$PWD" main.o fakemain.o -lfunction -lphobos2
% ls
a.out*  fakemain.d  fakemain.o  function.d  function.o  
libfunction.so*  main.c  main.o

Lets try...
% LD_LIBRARY_PATH="$PWD" ./a.out
[1]    31468 segmentation fault (core dumped)  
LD_LIBRARY_PATH="$PWD" ./a.out
% LD_LIBRARY_PATH="$PWD" gdb -q ./a.out
Reading symbols from 
/home/paolo/uni/ostar/ostar/c_exact_algorithm/tmp/a.out...(no 
debugging symbols found)...done.
(gdb) run
Starting program: 
/home/paolo/uni/ostar/ostar/c_exact_algorithm/tmp/a.out
warning: Could not load shared library symbols for 
linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?

Program received signal SIGSEGV, Segmentation fault.
0x00000000004037d1 in gc_qalloc ()
(gdb) bt
#0  0x00000000004037d1 in gc_qalloc ()
#1  0x000000000040199c in _d_arraysetlengthT ()
#2  0x00007ffff7bda842 in blah () from 
/home/paolo/uni/ostar/ostar/c_exact_algorithm/tmp/libfunction.so
#3  0x0000000000400ad2 in main ()
(gdb)
It fails :(

What I am doing wrong?
I think there is something the D language does before starting 
main.
And the C language does not. Can I initialize the program 
correctly
manually? Or it is another problem altogether?

Thanks,
Paolo & Kevin