我有动态库中的一些C函数(这里只是zlibVersion
),我想从cabal包中的捆绑C代码调用。在这里,我将其直接称为外部导入,并间接通过捆绑的C代码来表明后者崩溃ghci,即使在前者成功之后。
Main.hs:
module Main (main) where
import Foreign.C.String (CString, peekCString)
foreign import ccall "foreign_test" foreignTest :: IO ()
foreign import ccall "zlibVersion" zlibVersion :: IO CString
main :: IO ()
main = do
zlibVersion >>= peekCString >>= putStrLn
foreignTest
foreign_test.c:
#include <stdio.h>
#include <zlib.h>
void foreign_test() {
puts(zlibVersion());
}
从编译的二进制文件中可以正常工作:
$ cabal build
$ dist/build/cabal-extra-libs-test/cabal-extra-libs-test
1.2.5
1.2.5
但是间接调用崩溃了ghci:
$ cabal repl
Preprocessing executable 'cabal-extra-libs-test' for
cabal-extra-libs-test-0.1.0.0...
GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help
[1 of 1] Compiling Main ( Main.hs, interpreted )
Ok, modules loaded: Main.
*Main> main
1.2.5
dyld: lazy symbol binding failed: Symbol not found: _zlibVersion
Referenced from: /var/folders/pz/920gzhqn01q8d6vjkvy1yvdr0000gn/T/ghc6850_0/libghc_1.dylib
Expected in: flat namespace
dyld: Symbol not found: _zlibVersion
Referenced from: /var/folders/pz/920gzhqn01q8d6vjkvy1yvdr0000gn/T/ghc6850_0/libghc_1.dylib
Expected in: flat namespace
小集团-EXTRA-库-test.cabal:
name: cabal-extra-libs-test
version: 0.1.0.0
build-type: Simple
cabal-version: >=1.10
executable cabal-extra-libs-test
default-language: Haskell2010
main-is: Main.hs
build-depends: base
c-sources: foreign_test.c
extra-libraries: z
在OS X 10.11.5上,GHC为7.10.3,cabal-install为1.24.0.0。使用堆栈和堆栈构建ghci会产生相同的崩溃。
答案 0 :(得分:1)
这很奇怪..我对OSX知之甚少,但是dyld: lazy symbol binding failed: Symbol not found: _zlibVersion
给人的印象它认为OSX是一个下划线平台(例如C函数被_修复的平台)。
这是标准的GHC构建吗?你能试试8.0.1
吗?链接器中的批次发生了变化。