Hello all, The other night I decide to have a go at making my own shared library. To start with I thought I would create a library containing one function which prints out a simple message so we do… #include void libmessage(void); void libmessage(void) { printf(“hello from lib\n”); } I then compile this as a shared library following the example in the manual with the compiler. I am using a version of gcc ported over to Qnx RtP. I then write a program to try and call this library and this is where the limit of my knowledge ends and guess work starts. So we do…. #include void libmessage(void); void main(void) { printf (“hello from program\n”); libmessage(); } Now when I try to compile this (linking it to my library as given in other examples in the manual) I get an error message saying something like undefined reference to libmessage(). (I think it was that, but I am not on my qnx machine at the moment and I forgot to write it down!). Any way I think it is something to do with the way I tell my program about the function in my library am I doing that part right? I did a search on the Internet but could not find anything about writing libraries so if you could tell me what I am doing wrong or direct me to a site about library creation I would be most grateful. Sorry for being so long Paul R

ops sorry about the double post

Paul R

Thanks Houdini

There is an error at the linking stage, I will take it to a more appropiate web forum I was thinking along the lines there must be something wrong with my code and as the aim of figuring out libs is so I get make a 2d gamming library (mainly for fun and educating myself). I thought it would make a good first post on this web site, been lurking here for a while and it seems like a friendly place

thanks again

Paul R