Re: GNAT for NT Linking Problem

[Bruce.Conroy@jpl.nasa.gov]

In <32342D50.1E1C@planet8.eag.unisysgsg.com>, Matt O'Hara
<mohara@planet8.eag.unisysgsg.com> writes:

>I'm in the process of porting a Solaris Ada program to the PC, using
>GNAT 304a for Windows NT (freshly ftp'd and installed). This Ada program
>uses the C libraries extensively (basic things, like fputc, fgetc, feof,
>toupper, etc).
>
>All the Ada code compiles correctly, yet when I try to link I am getting
>errors referencing some of these C libraries. For example, it cant find
>things like toupper or feof, yet it (evidently, based on the lack of
>error message) can find things like tolower and fputc. Considering that
>these routines should come from the same sets of libraries, it seems odd
>that the linker could find one thing but not the others.
>
>I had similar problems when I tried installing and using the GNAT 301a
>compiler.
>
>Any ideas?


The ones you can't find are the ones that are defined as macros in one
of the C header files rather than real code. Thus there is nothing in
the library to link in. It is very system dependent. The one I have
fought is "feof" which is a macro on OS/2, but compiled code on
Solaris.

my solution is shown in the following body definition:

   function FEOF(HANDLE : HANDLE_TYPE) return integer;
   pragma Import (C, FEOF
      -- on some systems FEOF is a
      -- macro. On these it is necessary
      -- to compile the following program
         --  #include <stdio.h>
         --
         --  int END_FILE (FILE *s)
         --     {return (s->flags & _IOEOF ? 1: 0);}
      -- then add the resuling object to either
      -- the linker or one of the libraries,
      -- and uncomment the following line
              , "END_FILE"
           );

Lots of luck.

     Bruce