C++: Difference between revisions

===Startup code===

By default, G++ attempts to link in startup code - the stuff usually done before main() is called, and after it exits / returns. This is all fine in a hosted environment, but you don't want to have it in your kernel (and it would not compile, either). Disable this by setting -nostartfiles.

 

If you want to use pure virtual functions, your compiler needs one support function. It is only called in case a pure virtual function call cannot be made (e.g. if you have overriden the virtual function table of an object). But nonetheless your linker will complain about unresolved symbols, if you use pure virtual functions and don't provide that support routine.