solaris to linux porting
 

while porting a C code from solaris to linux there are some differences in the files when compiled.Are there any tools that can help to get the functions that has to be changed while porting from solaris to linux.

I don't know if I got you right: you're looking for tools that help you porting source code from Solaris to Linux? I doubt that something like that exists.
I'm especially uncertain on how to interpret this part, could you please be a little more specific?

I have a C code that reads from a file and generating another file writing the bytes in to it.....I am not sure whether different platforms will have different output and what will cause this problem.

Do you mean Little-/Big-Endian problems/conversions?