• Carlo (23/23) Nov 12 2010 Sorry if I bother you again with this probably silly problem. Here is
• Michal Minich (2/33) Nov 12 2010 You probably need to include phobos library in gcc command line.
• Carlo (3/36) Nov 12 2010 Thanks for the reply. How do I do that? adding -lphobos doesn't work.
• Michal Minich (17/56) Nov 13 2010 Sorry, this was a bad advice.
• Michal Minich (17/56) Nov 13 2010 Sorry, this was a bad advice.
• Simen kjaeraas (6/8) Nov 13 2010 Wrong. It means the function has C calling convention. If it has a body,
• Michal Minich (2/10) Nov 13 2010 Thanks.
• Carlo (3/9) Nov 14 2010 That's what I read in Andrei's TDPL, still he doesn't add anything to
• Carlo (64/97) Nov 14 2010 Actually there exist a library phobos2, but i think it's a D object

Carlo <carlo.lucibello gmail.com> writes:

Sorry if I bother you again with this probably silly problem. Here is 
the point. I want to call the D function "fun" from a .c file:

\\file libforc.d
extern (C) int fun(int x,int y){
         return x;
}
\\EOF

\\file ctest.c
#include <stdio.h>

int fun(int,int);

int main(int argc, char* argv[])
{
      printf("%d",fun(2,3));

      return 0;
}
\\EOF

This what I get trying to compile the .c file:

$ dmd libforc.d -c
$ gcc libforc.o ctest.c -m32
libforc.o: In function `no symbol':
libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref'
collect2: ld returned 1 exit status

What did I miss?

Michal Minich <michal.minich gmail.com> writes:

V Fri, 12 Nov 2010 16:14:30 +0100, Carlo wrote:

 Sorry if I bother you again with this probably silly problem. Here is
 the point. I want to call the D function "fun" from a .c file:
 
 \\file libforc.d
 extern (C) int fun(int x,int y){
          return x;
 }
 \\EOF
 
 \\file ctest.c
 #include <stdio.h>
 
 int fun(int,int);
 
 int main(int argc, char* argv[])
 {
       printf("%d",fun(2,3));
 
       return 0;
 }
 \\EOF
 
 This what I get trying to compile the .c file:
 
 $ dmd libforc.d -c
 $ gcc libforc.o ctest.c -m32
 libforc.o: In function `no symbol':
 libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref' collect2:
 ld returned 1 exit status
 
 What did I miss?

You probably need to include phobos library in gcc command line.

Carlo <carlo.lucibello gmail.com> writes:

On 12/11/2010 16:19, Michal Minich wrote:
 V Fri, 12 Nov 2010 16:14:30 +0100, Carlo wrote:

 Sorry if I bother you again with this probably silly problem. Here is
 the point. I want to call the D function "fun" from a .c file:

 \\file libforc.d
 extern (C) int fun(int x,int y){
           return x;
 }
 \\EOF

 \\file ctest.c
 #include<stdio.h>

 int fun(int,int);

 int main(int argc, char* argv[])
 {
        printf("%d",fun(2,3));

        return 0;
 }
 \\EOF

 This what I get trying to compile the .c file:

 $ dmd libforc.d -c
 $ gcc libforc.o ctest.c -m32
 libforc.o: In function `no symbol':
 libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref' collect2:
 ld returned 1 exit status

 What did I miss?

 You probably need to include phobos library in gcc command line.

Thanks for the reply. How do I do that? adding -lphobos doesn't work. 
Phobos sources seem to be in /src/phobos

Michal Minich <michal.minich gmail.com> writes:

On Sat, 13 Nov 2010 00:00:00 +0100, Carlo wrote:

 On 12/11/2010 16:19, Michal Minich wrote:
 V Fri, 12 Nov 2010 16:14:30 +0100, Carlo wrote:

 Sorry if I bother you again with this probably silly problem. Here is
 the point. I want to call the D function "fun" from a .c file:

 \\file libforc.d
 extern (C) int fun(int x,int y){
           return x;
 }
 \\EOF

 \\file ctest.c
 #include<stdio.h>

 int fun(int,int);

 int main(int argc, char* argv[])
 {
        printf("%d",fun(2,3));

        return 0;
 }
 \\EOF

 This what I get trying to compile the .c file:

 $ dmd libforc.d -c
 $ gcc libforc.o ctest.c -m32
 libforc.o: In function `no symbol':
 libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref' collect2:
 ld returned 1 exit status

 What did I miss?

 You probably need to include phobos library in gcc command line.

 
 Thanks for the reply. How do I do that? adding -lphobos doesn't work.
 Phobos sources seem to be in /src/phobos

Sorry, this was a bad advice.

first: extern (C) means that the function 'fun' is not defined in D, but 
in C. So you can call it from D. like:

//file.d
extern (C) int fun(int x,int y);
void main () { writeln ( foo() ); }

//file.c
int fun(int x,int y){ return x; }

you can then compile C file in gcc to generate .o file, which can be used 
with dmd.

But you want the opposite direction, which I'm not sure is possible, at 
least in one executable. You should probably generate dynamic link 
library in D and then use it in C.

there is how to do it in Windows, which doesn't help you much... :(

anyway, you should use word 'export' to make D functions accessible from 
outside.

Michal Minich <michal.minich gmail.com> writes:

On Sat, 13 Nov 2010 00:00:00 +0100, Carlo wrote:

 On 12/11/2010 16:19, Michal Minich wrote:
 V Fri, 12 Nov 2010 16:14:30 +0100, Carlo wrote:

 Sorry if I bother you again with this probably silly problem. Here is
 the point. I want to call the D function "fun" from a .c file:

 \\file libforc.d
 extern (C) int fun(int x,int y){
           return x;
 }
 \\EOF

 \\file ctest.c
 #include<stdio.h>

 int fun(int,int);

 int main(int argc, char* argv[])
 {
        printf("%d",fun(2,3));

        return 0;
 }
 \\EOF

 This what I get trying to compile the .c file:

 $ dmd libforc.d -c
 $ gcc libforc.o ctest.c -m32
 libforc.o: In function `no symbol':
 libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref' collect2:
 ld returned 1 exit status

 What did I miss?

 You probably need to include phobos library in gcc command line.

 
 Thanks for the reply. How do I do that? adding -lphobos doesn't work.
 Phobos sources seem to be in /src/phobos

Sorry, this was a bad advice.

first: extern (C) means that the function 'fun' is not defined in D, but 
in C. So you can call it from D. like:

//file.d
extern (C) int fun(int x,int y);
void main () { writeln ( foo() ); }

//file.c
int fun(int x,int y){ return x; }

you can then compile C file in gcc to generate .o file, which can be used 
with dmd.

But you want the opposite direction, which I'm not sure is possible, at 
least in one executable. You should probably generate dynamic link 
library in D and then use it in C.

there is how to do it in Windows, which doesn't help you much... :(

anyway, you should use word 'export' to make D functions accessible from 
outside.

"Simen kjaeraas" <simen.kjaras gmail.com> writes:

Michal Minich <michal.minich gmail.com> wrote:

 first: extern (C) means that the function 'fun' is not defined in D, but
 in C.

Wrong. It means the function has C calling convention. If it has a body,
it is defined in D, and can be called from C (and D). If not, it is defined
elsewhere, and can be called from D.

-- 
Simen

Michal Minich <michal.minich gmail.com> writes:

On Sat, 13 Nov 2010 14:20:05 +0100, Simen kjaeraas wrote:

 Michal Minich <michal.minich gmail.com> wrote:
 
 first: extern (C) means that the function 'fun' is not defined in D,
 but in C.

 
 Wrong. It means the function has C calling convention. If it has a body,
 it is defined in D, and can be called from C (and D). If not, it is
 defined elsewhere, and can be called from D.

Thanks.

Carlo <carlo.lucibello gmail.com> writes:

On 13/11/2010 14:20, Simen kjaeraas wrote:
 Michal Minich <michal.minich gmail.com> wrote:

 first: extern (C) means that the function 'fun' is not defined in D, but
 in C.

 Wrong. It means the function has C calling convention. If it has a body,
 it is defined in D, and can be called from C (and D). If not, it is defined
 elsewhere, and can be called from D.

That's what I read in Andrei's TDPL, still he doesn't add anything to 
it, so I can't figure out compiler's instruction.

Carlo <carlo.lucibello gmail.com> writes:

On 12/11/2010 16:19, Michal Minich wrote:
 V Fri, 12 Nov 2010 16:14:30 +0100, Carlo wrote:

 Sorry if I bother you again with this probably silly problem. Here is
 the point. I want to call the D function "fun" from a .c file:

 \\file libforc.d
 extern (C) int fun(int x,int y){
           return x;
 }
 \\EOF

 \\file ctest.c
 #include<stdio.h>

 int fun(int,int);

 int main(int argc, char* argv[])
 {
        printf("%d",fun(2,3));

        return 0;
 }
 \\EOF

 This what I get trying to compile the .c file:

 $ dmd libforc.d -c
 $ gcc libforc.o ctest.c -m32
 libforc.o: In function `no symbol':
 libforc.d:(.text+0x8): undefined reference to `_Dmodule_ref' collect2:
 ld returned 1 exit status

 What did I miss?

 You probably need to include phobos library in gcc command line.

Actually there exist a library phobos2, but i think it's a D object 
file. Here is what I get:

carlo carlo-laptop:~/d$ dmd -c libforc.d
carlo carlo-laptop:~/d$ ar rcs libforc.a libforc.o
carlo carlo-laptop:~/d$ gcc -L. -lforc -lphobos2 -m32 ctest.c
/tmp/ccpbEtKu.o: In function `main':
ctest.c:(.text+0x0): multiple definition of `main'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(dmain2_503_1a5.o):src/rt/dmain2
d:(.text.main+0x0): 
first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.
(dmain2_503_1a5.o): 
In function `_D2rt6dmain24mainUiPPaZi7runMainMFZv':
src/rt/dmain2.d:(.text._D2rt6dmain24mainUiPPaZi7runMainMFZv+0x16): 
undefined reference to `_Dmain'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(critical.o): 
In function `_STI_critical_init':
critical.c:(.text+0x43): undefined reference to `pthread_mutexattr_init'
critical.c:(.text+0x57): undefined reference to 
`pthread_mutexattr_settype'carlo carlo-laptop:~/d$ dmd -c libforc.d
carlo carlo-laptop:~/d$ ar rcs libforc.a libforc.o
carlo carlo-laptop:~/d$ gcc -L. -lforc -lphobos2 -m32 ctest.c
/tmp/ccpbEtKu.o: In function `main':
ctest.c:(.text+0x0): multiple definition of `main'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(dmain2_503_1a5.o):src/rt/dmain2
d:(.text.main+0x0): 
first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.
(dmain2_503_1a5.o): 
In function `_D2rt6dmain24mainUiPPaZi7runMainMFZv':
src/rt/dmain2.d:(.text._D2rt6dmain24mainUiPPaZi7runMainMFZv+0x16): 
undefined reference to `_Dmain'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(critical.o): 
In function `_STI_critical_init':
critical.c:(.text+0x43): undefined reference to `pthread_mutexattr_init'
critical.c:(.text+0x57): undefined reference to `pthread_mutexattr_settype'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(monitor.o): 
In function `_STD_monitor_staticdtor':
monitor.c:(.text+0x1dc): undefined reference to `pthread_mutexattr_destroy'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(monitor.o): 
In function `_STI_monitor_staticctor':
monitor.c:(.text+0x1f9): undefined reference to `pthread_mutexattr_init'
monitor.c:(.text+0x20d): undefined reference to `pthread_mutexattr_settype'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2
a(thread_e7_258.o): 
In function `_D4core6thread6Thread6__dtorMFZv':
src/core/thread.d:(.text._D4core6thread6Thread6__dtorMFZv+0x17): 
undefined reference to `pthread_detach'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2
a(thread_e7_258.o): 
In function `_D4core6thread6Thread5startMFZv':
src/core/thread.d:(.text._D4core6thread6Thread5startMFZv+0x79): 
undefined reference to `pthread_attr_setstacksize'

/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(monitor.o): 
In function `_STD_monitor_staticdtor':
monitor.c:(.text+0x1dc): undefined reference to `pthread_mutexattr_destroy'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2.a(monitor.o): 
In function `_STI_monitor_staticctor':
monitor.c:(.text+0x1f9): undefined reference to `pthread_mutexattr_init'
monitor.c:(.text+0x20d): undefined reference to `pthread_mutexattr_settype'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2
a(thread_e7_258.o): 
In function `_D4core6thread6Thread6__dtorMFZv':
src/core/thread.d:(.text._D4core6thread6Thread6__dtorMFZv+0x17): 
undefined reference to `pthread_detach'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib32/libphobos2
a(thread_e7_258.o): 
In function `_D4core6thread6Thread5startMFZv':
src/core/thread.d:(.text._D4core6thread6Thread5startMFZv+0x79): 
undefined reference to `pthread_attr_setstacksize'
................................................