"Rafael Espíndola" <[EMAIL PROTECTED]> writes: | I am trying to build a table with offsets of global pointers from a | given pointer: | | void *fs[] = {f1 - f1, f2 - f1}; | | where f1 and f2 are functions. | | GCC is able to figure out that (f1 - f1) is 0, but says "initializer | element is not constant" when trying to compute (f2 - f1).
because that is what the language standard says. In general, the difference between two global pointers is something known only to the linker -- too late to evaluate as constant expression. -- Gaby