Hi, I tried to compile the following program by GHC {-# LANGUAGE CPP #-} module Packer where #define FLASH_APP_START 1 #define FLASH_APP_END 2 #define INSERT_SECTION(x) (#x, (FLASH_##x##_START, FLASH_##x##_END)) import qualified Data.Map as M import Data.Tuple import System.IO as Sys type Name = String type Boundary = (Int, Int) boundaryList = [INSERT_SECTION(APP)] main = Sys.print boundaryList But failed with test.hs:16:17: Not in scope: `#' test.hs:16:17: A section must be enclosed in parentheses thus: (# APP) test.hs:16:18: Not in scope: data constructor `APP' test.hs:16:24: Not in scope: data constructor `FLASH_' test.hs:16:30: Not in scope: `##' test.hs:16:32: Not in scope: data constructor `APP' test.hs:16:35: Not in scope: `##' Seems GHC does support macro like #x a##b. Is that true? If not, how to resolve? Thanks alot. Haihua