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digitalmars.D - Linking DMD Object Files with other compilers object files.

reply "Bruno Medeiros" <daiphoenixNOSPAM lycos.com> writes:
Hello!
 I want to link D object files with C objects files, but I'm running with 
some compatibility problems because I want to use a different compiler for C 
code (Mingw or VC++).
For what I've learned (correct me if I'm wrong) DMD produces OMF object 
files and Mingw and VC++ produce COFF object files (I don't even know if 
these last two COFF files are compatible).
I would appreciate some help on this issue. Can DMD only produce files in 
the OMF format? (an outdated and bad format for what I've read) Or is there 
a tool to convert betwen these two formats? (I did a quick search on google 
but didn't find anything) Are there any issues in the convertion?

Bruno Medeiros
Apr 29 2005
next sibling parent bobef <bobef_member pathlink.com> writes:
Sounds like fairytail to me... It would be too nice if all things were comatible
;]

In article <d4u9hk$1npu$1 digitaldaemon.com>, Bruno Medeiros says...

Hello!
 I want to link D object files with C objects files, but I'm running with 
some compatibility problems because I want to use a different compiler for C 
code (Mingw or VC++).
For what I've learned (correct me if I'm wrong) DMD produces OMF object 
files and Mingw and VC++ produce COFF object files (I don't even know if 
these last two COFF files are compatible).
I would appreciate some help on this issue. Can DMD only produce files in 
the OMF format? (an outdated and bad format for what I've read) Or is there 
a tool to convert betwen these two formats? (I did a quick search on google 
but didn't find anything) Are there any issues in the convertion?

Bruno Medeiros
Apr 29 2005
prev sibling next sibling parent Jan Jezabek <jezabek poczta.onet.pl> writes:
Bruno Medeiros wrote:

 Hello!
  I want to link D object files with C objects files, but I'm running with 
 some compatibility problems because I want to use a different compiler for C 
 code (Mingw or VC++).
 For what I've learned (correct me if I'm wrong) DMD produces OMF object 
 files and Mingw and VC++ produce COFF object files (I don't even know if 
 these last two COFF files are compatible).
 I would appreciate some help on this issue. Can DMD only produce files in 
 the OMF format? (an outdated and bad format for what I've read) Or is there 
 a tool to convert betwen these two formats? (I did a quick search on google 
 but didn't find anything) Are there any issues in the convertion?
 
 Bruno Medeiros 
 
 


You may want to try this: use ndisasm to disassemble the OMF and then 
nasm to assemble it to COFF. You can find both at nasm.sourceforge.net .
I don't know if this will work, and I believe that even if it does 
you'll run across several other problems like name mangling etc.
Regarding Mingw/VC++ COFF - they are somewhat compatible, I was able to 
link object files from both compilers; of course I was sticking to C to 
avoid problems with new/delete and name mangling.

Regards,
JJ
Apr 29 2005
prev sibling parent reply "Walter" <newshound digitalmars.com> writes:
"Bruno Medeiros" <daiphoenixNOSPAM lycos.com> wrote in message
news:d4u9hk$1npu$1 digitaldaemon.com...

 Hello!
  I want to link D object files with C objects files, but I'm running with
 some compatibility problems because I want to use a different compiler for


C

 code (Mingw or VC++).
 For what I've learned (correct me if I'm wrong) DMD produces OMF object
 files and Mingw and VC++ produce COFF object files (I don't even know if
 these last two COFF files are compatible).
 I would appreciate some help on this issue. Can DMD only produce files in
 the OMF format? (an outdated and bad format for what I've read) Or is


there

 a tool to convert betwen these two formats? (I did a quick search on


google

 but didn't find anything) Are there any issues in the convertion?


This issue comes up often. I updated the FAQ for it.
www.digitalmars.com/d/faq.html#omf
Apr 30 2005
parent Bruno Medeiros <daiphoenixNOSPAM gmail.com> writes:
Walter wrote:

 "Bruno Medeiros" <daiphoenixNOSPAM lycos.com> wrote in message
 news:d4u9hk$1npu$1 digitaldaemon.com...
 

Hello!
 I want to link D object files with C objects files, but I'm running with
some compatibility problems because I want to use a different compiler for


 
 C
 

code (Mingw or VC++).
For what I've learned (correct me if I'm wrong) DMD produces OMF object
files and Mingw and VC++ produce COFF object files (I don't even know if
these last two COFF files are compatible).
I would appreciate some help on this issue. Can DMD only produce files in
the OMF format? (an outdated and bad format for what I've read) Or is


 
 there
 

a tool to convert betwen these two formats? (I did a quick search on


 
 google
 

but didn't find anything) Are there any issues in the convertion?


 
 
 This issue comes up often. I updated the FAQ for it.
 www.digitalmars.com/d/faq.html#omf
 
 


Yup, I've read it, and made some simple tests and it worked. A few more 
questions though:


 "conforming to the usual C ABI interface"


Well, a restriction like that was to be expected. But that also means I 
can use C++ code that I can put inside a extern "C" {}  , right?


It says on the FAQ you can convert libraries "that come in the form of a 
DLL", but on the coff2omf page it says you can also convert .obj files. 
I tried a simple test with MingW and a VStudio 2005 generated .obj's. 
The MingW .obj worked, the VStudio .obj didn't (link errors with the 
Debug .obj, and runtime access violations with the Release .obj). What 
more should I know about converting .obj files (besides that they should 
have the C ABI) ? Or should I just stick with import libraries?


Also, is the DM coff2omf tool freely available? On the DM website it 
says it's part of the (paid) Extended Utility package, and I had to use 
google to find a download link, which did happen to be on the DM site 
though (ftp://ftp.digitalmars.com/Digital_Mars_C++/Patch/COFF2OMF.zip), 
but for which I don't even know if its the latest version.


Bruno Medeiros
May 17 2005