How do I find undefined functions and add/link them as external functions?

Question

I'm new to IAR workbenches in general (and EWARM to be precise), so I have a couple of potentially silly questions. For starters, here's what I actually want to do and the questions aroused:

1. I need to check .o (.obj) file for undefined symbols and potentially collect them. When I was workings with GCC, I used nm with --undefined-only option to list such symbols. So, is there a similar tool in IAR (EWARM)?
2. Having these undefined symbols collected, I need to manually link these symbols (functions) to specific addresses. While working with GCC I used ld script and placed function = address entries in ENTRY part of the script. So, what's the right way to do the same thing in EWARM?

Any help is appreciated.

Answer 1

1. There is no direct way of doing this using only the tools from the EWARM distribution but since iccarm produces ELF-files you can continue using nm --undefined-only for this step.

2. There are at least two different ways of doing this. First, there is a command-line option to ilink that allows you to define symbol to address mappings. For instance, adding --define_symbol print=0x1234 will add the symbol print with the value 0x1234. Second, symbols can be defined in the linker configuration file (.icf-file) using the define exported symbol directive. The example above is expressed as define exported symbol print = 0x1234.