Re: Calling C++ from within ADA

[ncohen@watson.ibm.com (Norman H. Cohen)]

In article <CVANOVER.1.0007E49E@bamanet.ua.edu>, CVANOVER@bamanet.ua.edu
writes: 

|> Is there a way to call a C++ procedure from within ADA? I can call a C
|> procedure with
|>
|> package C_LIB is
|>         procedure clear_screen;
|>         procedure sleep_a_moment;
|> private
|>         pragma interface(c,clear_screen);
|>         pragma interface(c,sleep_a_moment);
|> end C_LIB;
|>
|> However, when I compile the same C procedure in C++ I get the following error: 
|> 0706-317 ERROR: Unresolved or undefined symbols detected: 
|>                  Symbols in error (followed by references) are
|>                  dumped to the load map.
|>                  The -bloadmap:<filename> option will create a load map.
|> .clear_screen
|>
|> I've tried adding INTERFACE_INFORMATION but it doesn't seem to help.
|>
|> I am using IBM AIX on an RS6000.

The error message comes from the linker, ld, which is invoked by the
compiler when you compile with -b or -m (to construct an executable main
program).  I suspect that your C++ compiler is creating a "mangled"
external name for clear_screen, rather than the name .clear_screen
created by your C compiler.  Use the AIX nm command to see the external
symbols in the .o file produced by your C++ compiler, and, if you can
figure out which one is a mangled name for clear_screen, adjust your
Interface_Information pragma accordingly.

--
Norman H. Cohen    ncohen@watson.ibm.com