Help needed getting started

[Michael Gerbracht]

I am trying to get into C/C++ programming on RISC OS. I would like to start
with writing a small toolbox program using OSLib with Acorn C/C++ DDE using
shared makefiles. I did get a demo app running using the native wimp and
toolbox libraries but would now like to use OSLib instead.

Currently I am facing two problems. The first one is compiling. Whenever I
try to compile it the first time I get the follwoing errors:

cc -c -depend !Depend   -IC:,OSLibSupport:,OSLib: -ff -fah -o o.main c.main
Norcroft RISC OS ARM C vsn 5.82 [03 Apr 2020]
"C:h.toolbox", line 62: Error: differing redefinition of #define macro TRUE
"C:h.toolbox", line 63: Error: differing redefinition of #define macro FALSE
"C:h.toolbox", line 185: Error: differing redefinition of #define macro
Toolbox_CreateObject
[and many more similar errors...]

When trying for a second time everything seems ok and the application builds
- still I think this is not a good thing and I feel I am missing something
important here.

The second problem is, that the app crashes when I try to start it with an
"abort on data transfer at 000082E0".

Any help is welcome. I am just starting with C/C++ so I probably make stupid
mistakes. 

I can also attach the code I have (if this is allowed) or upload it
somewhere. I have looked at the !Dustbin demo app but obviously I am still
doing something wrong. If there is another example app which uses toolbox +
OSLib + Shared Makefiles this might also help me to find the error.

thanks a lot,
Michael