GHC链接问题

Question

我想编译下面的代码。

import Data.List 
import Data.Ord 
import qualified Data.MemoCombinators as Memo 

collatzLength :: Int -> Int 
collatzLength = Memo.arrayRange (1, 1000000) collatzLength' 
    where 
    collatzLength' 1 = 1 
    collatzLength' n | odd n = 1 + collatzLength (3 * n + 1) 
        | even n = 1 + collatzLength (n `quot` 2) 

main = print $ maximumBy (comparing fst) $ [(collatzLength n, n) | n <- [1..1000000]] 

的Haskell编译吐出：

euler14.o: In function `s1pw_info': 
(.text+0x8dd): undefined reference to `__stginit_datazmmemocombinatorszm0zi4zi1_DataziMemoCombinators_' 
euler14.o: In function `rfX_info': 
(.text+0x35d): undefined reference to `datazmmemocombinatorszm0zi4zi1_DataziMemoCombinators_arrayRange_info' 
euler14.o: In function `rfX_srt': 
(.data+0x4c): undefined reference to `datazmmemocombinatorszm0zi4zi1_DataziMemoCombinators_arrayRange_closure' 
collect2: ld returned 1 exit status 

我试着用搜索引擎，但无济于事。有没有可以查找这些错误的地方？他们的意思是什么？

Answer 1

您必须编译--make标志。