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January 05, 2005
Calling C function
Hi,

I know it is possible to call a C function from D. It works on Linux. I 
don't have a very in depth knowledge of C and linking so please excuse 
my ignorence if I have missed something obvious.


I have the following two files:

------------------------------
#file mylib.c
int get_one()
{
   return 1;
}
------------------------------

------------------------------
#file test.d

extern (C) int get_one();

void main()
{
   printf("Result: %d", get_one());
}
------------------------------

On Linux I compile with:
gcc -c mylib.c

Results in mylib.o

Then compile and link the d code:
dmd test.d mylib.o

This works, no complaints and the output is correct.

When I try to do this with the Microsoft compiler like:
cl /c /TC mylib.c

it produces a mylib.obj

and then I run:
dmd.exe test.d mylib.obj

it complaints with the folowing message:
C:\Documents and Settings\martijn\d>dmd test.obj mylib.obj
c:\opt\dmd\bin\..\..\dm\bin\link.exe test+mylib,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

mylib.obj Offset 00000H Record Type 004C
 Error 138: Module or Dictionary corrupt
--- errorlevel 1

Has this someting to do with an import library? How do I get this to work?

Thanks in advance,

Martijn.
January 05, 2005
Re: Calling C function
Microsoft uses COFF object format , Digital Mars uses OMF.  Youll need to
compile mylib.c with DMC ( dmc -c mylib.c ) , and then the rest of the
command.

Seems to be a source of many headaches , I would complain but DM is blazing
fast i think OMF is partly a reason :).  It also helps promote DMC so thats
good too.

Charlie

"Tino" <mvandenboogaard@gmail.com> wrote in message
news:crhrvl$6vg$1@digitaldaemon.com...
> Hi,
>
> I know it is possible to call a C function from D. It works on Linux. I
> don't have a very in depth knowledge of C and linking so please excuse
> my ignorence if I have missed something obvious.
>
>
> I have the following two files:
>
> ------------------------------
> #file mylib.c
> int get_one()
> {
>     return 1;
> }
> ------------------------------
>
> ------------------------------
> #file test.d
>
> extern (C) int get_one();
>
> void main()
> {
>     printf("Result: %d", get_one());
> }
> ------------------------------
>
> On Linux I compile with:
> gcc -c mylib.c
>
> Results in mylib.o
>
> Then compile and link the d code:
> dmd test.d mylib.o
>
> This works, no complaints and the output is correct.
>
> When I try to do this with the Microsoft compiler like:
> cl /c /TC mylib.c
>
> it produces a mylib.obj
>
> and then I run:
> dmd.exe test.d mylib.obj
>
> it complaints with the folowing message:
> C:\Documents and Settings\martijn\d>dmd test.obj mylib.obj
> c:\opt\dmd\bin\..\..\dm\bin\link.exe test+mylib,,,user32+kernel32/noi;
> OPTLINK (R) for Win32  Release 7.50B1
> Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
>
> mylib.obj Offset 00000H Record Type 004C
>   Error 138: Module or Dictionary corrupt
> --- errorlevel 1
>
> Has this someting to do with an import library? How do I get this to work?
>
> Thanks in advance,
>
> Martijn.
January 06, 2005
Re: Calling C function
Indeed that works! Thanks Charles. Learned something new on this 
beautiful day!


Charles wrote:
> Microsoft uses COFF object format , Digital Mars uses OMF.  Youll need to
> compile mylib.c with DMC ( dmc -c mylib.c ) , and then the rest of the
> command.
> 
> Seems to be a source of many headaches , I would complain but DM is blazing
> fast i think OMF is partly a reason :).  It also helps promote DMC so thats
> good too.
> 
> Charlie
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