Apple disabled nested functions during their switchover to the Intel processors. Xcode 2.2 says of nested functions: “Nested functions not supported in OS X 10.4.”. Installing Xcode 2.3 installs version 4.0.1 of gcc (build 5341) that compiles and runs each of the several programs I have tested with nested functions but only if I say please by including the new gcc compile line option “-fnested-functions”. I think this has to do with turning on the new x86 page table entry bit that disables instruction fetching from pages of the stack and heap. I guess that they don’t do this if some of the loaded programs have been compiled with this option.
If you compile a target in Xcode with nested functions, Xcode passes on the compiler complaint about nested functions. Xcode seems itself not to know about nested functions. You must speak to it not of nested functions, but of compiler options. You must do the following:
Here is the reason for all the fuss, I think.