• MGW (34/34) Jun 21 2015 Linux 32, dmd 2.067.0
• Sean Campbell (25/60) Jun 21 2015 actually its that druntime hasn't been initialized just add:
• Jacob Carlborg (7/14) Jun 21 2015 These two functions are not necessary. There are already functions in

"MGW" <mgw yandex.ru> writes:

Linux 32, dmd 2.067.0

I want to connect and execute function D from main() C++.

---- d1.d ----
import core.stdc.stdio;

extern (C++) void d1() {
     printf("printf - exec d1()");
}

---- main_c1.cpp ----
#include <stdio.h>

void d1(void);

int main(void) {
     d1();
     return 0;
}

---- compile ----
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  --->  This option works correctly!


If I try to cause the functions connected to GC in the D 
function, there is an error.
---- d1.d ----
import import std.stdio;

extern (C++) void d1() {
     writeln("writeln - exec d1()");
}

---- compile ----
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  --->  Error:
'./main_c1' terminated by signal SIGSEGV (Address boundary error)

Examples from dmd2/html/d/dll-linux.html don't work if instead of 
printf()
to use writeln(). I think that a problem in initialization of 
Phobos.

"Sean Campbell" <sycam.inc gmail.com> writes:

On Sunday, 21 June 2015 at 13:12:03 UTC, MGW wrote:
 Linux 32, dmd 2.067.0

 I want to connect and execute function D from main() C++.

 ---- d1.d ----
 import core.stdc.stdio;

 extern (C++) void d1() {
     printf("printf - exec d1()");
 }

 ---- main_c1.cpp ----
 #include <stdio.h>

 void d1(void);

 int main(void) {
     d1();
     return 0;
 }

 ---- compile ----
 dmd -c d1.d
 gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
 ./main_c1  --->  This option works correctly!


 If I try to cause the functions connected to GC in the D 
 function, there is an error.
 ---- d1.d ----
 import import std.stdio;

 extern (C++) void d1() {
     writeln("writeln - exec d1()");
 }

 ---- compile ----
 dmd -c d1.d
 gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
 ./main_c1  --->  Error:
 './main_c1' terminated by signal SIGSEGV (Address boundary 
 error)

 Examples from dmd2/html/d/dll-linux.html don't work if instead 
 of printf()
 to use writeln(). I think that a problem in initialization of 
 Phobos.

actually its that druntime hasn't been initialized just add:
import core.runtime;
import std.stdio;

extern(C++) void d1() {
      writeln("writeln - exec d1()");
}

extern(C++) void d_initialize() {
      Runtime.initialize();
}
extern(C++) void d_terminate()
{
      Runtime.terminate();
}

and the C++
#include <stdio.h>

void d1(void);
void d_initialize(void);
void d_terminate(void);

int main(void) {
     d_initialize();
     d1();
     d_terminate();
     return 0;
}

Jacob Carlborg <doob me.com> writes:

On 21/06/15 16:09, Sean Campbell wrote:

 extern(C++) void d_initialize() {
       Runtime.initialize();
 }
 extern(C++) void d_terminate()
 {
       Runtime.terminate();
 }

These two functions are not necessary. There are already functions in 
druntime which are supposed to be called from C/C++:

extern (C) bool rt_init();
extern (C) bool rt_term();

-- 
/Jacob Carlborg