Q66458: Pascal 4.00 and C 6.00 Mixed Language Considerations

Article: Q66458
Product(s): See article
Version(s): 6.00 6.00a | 6.00 6.00a
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | s_pascal | mspl13_c
Last Modified: 19-JAN-1991

To link objects created with Microsoft Pascal version 4.00 and
Microsoft C version 6.00 or 6.00a into the same executable, certain
objects must be removed from the standard Pascal library. If these
objects are not removed, the linker error "L2025: symbol defined more
than once" will occur on several symbols. These symbols are listed
below.

The following LIB command will remove the proper objects from the
Pascal library. LIB will create a backup of the original library
called LIBPASE.BAK. You will want to keep this backup copy for
straight Pascal linking.

   lib libpase -crt0 -nmalloc -fmalloc -amalloc -pnmsize;

When linking, the /NOD and /NOE switches must be used on the link
command line, and the C libraries must be listed before the Pascal,
for example:

   link /NOD /NOE c.obj pascal.obj,test.exe,,mlibce libpase;

Following is a list of errors that will occur if an attempt is made to
link without removing the necessary objects from the Pascal library:

   libpase.lib(nmalloc.asm) : error L2025: __nfree :
       symbol defined more than once
   libpase.lib(nmalloc.asm) : error L2025: __nmalloc :
       symbol defined more than once
   libpase.lib(amalloc.asm) : error L2025: __amblksiz :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __aexit_rtn :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __acmdln :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __asizds :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __astart :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __atopsp :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __acfinfo :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __aenvseg :
        symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __cintDIV :
       symbol defined more than once
   libpase.lib(os2\crt0.asm) : error L2025: __amsg_exit :
       symbol defined more than once

This procedure described above is necessary because the newer
libraries that shipped with C 6.00 use different start-up and memory
handling routines. Because the routines in the Pascal libraries will
not work correctly with the C 6.00 libraries, the objects must be
removed. Remember when building your application to compile the C code
with /AM, /AL, or /AH because the Pascal code will require far
function calls.

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