I'm trying to add an assemble-time check on a section's size. The basic approach is:
start_label: ... end_label: .ifgt (.-start_label)-256 .err .endif I'm using GNU assembler 2.14 20030612. The documentation for the - operator says "If both arguments are in the same section, the result is absolute." but the assembler says this is a non-constant expression. (the documentation says .if requires an "absolute expression") I've tried a bunch of variations, but can't see to get passed the "non- constant expression" error. Am I SOL here, or is there something else I can do. Thanks.
