我想构建一个包含haskell函数的动态库。我在linux上工作,想从C++代码中调用这个动态库。
我在http://wiki.python.org/moin/PythonVsHaskell上使用了这个示例,并拥有以下文件:
Test.hs:
{-# LANGUAGE ForeignFunctionInterface #-}
module Test where
import Foreign.C.Types
hsfun :: CInt -> IO CInt
hsfun x = do
putStrLn "Hello World"
return (42 + x)
foreign export ccall
hsfun :: CInt -> IO CInt
module_init.c:
#define CAT(a,b) XCAT(a,b)
#define XCAT(a,b) a ## b
#define STR(a) XSTR(a)
#define XSTR(a) #a
#include <HsFFI.h>
extern void CAT (__stginit_, MODULE) (void);
static void library_init (void) __attribute__ ((constructor));
static void
library_init (void)
{
/* This seems to be a no-op, but it makes the GHCRTS envvar work. */
static char *argv[] = { STR (MODULE) ".so", 0 }, **argv_ = argv;
static int argc = 1;
hs_init (&argc, &argv_);
hs_add_root (CAT (__stginit_, MODULE));
}
static void library_exit (void) __attribute__ ((destructor));
static void
library_exit (void)
{
hs_exit ();
}
现在我将这个文件编译成一个动态库:
$ ghc -dynamic -shared -fPIC -optc '-DMODULE=Test' Test.hs module_init.c -o libTest.so
[1 of 1] Compiling Test ( Test.hs, Test.o )
Linking libTest.so ...
这将创建一个文件Test_stub.h:
#include "HsFFI.h"
#ifdef __cplusplus
extern "C" {
#endif
extern HsInt32 hsfun(HsInt32 a1);
#ifdef __cplusplus
}
#endif
和Test_stub.c:
#define IN_STG_CODE 0
#include "Rts.h"
#include "Stg.h"
#ifdef __cplusplus
extern "C" {
#endif
extern StgClosure Test_zdfhsfunzua165_closure;
HsInt32 hsfun(HsInt32 a1)
{
Capability *cap;
HaskellObj ret;
HsInt32 cret;
cap = rts_lock();
cap=rts_evalIO(cap,rts_apply(cap,(HaskellObj)runIO_closure,rts_apply(cap,&Test_zdfhsfunzua165_closure,rts_mkInt32(cap,a1))) ,&ret);
rts_checkSchedStatus("hsfun",cap);
cret=rts_getInt32(ret);
rts_unlock(cap);
return cret;
}
static void stginit_export_Test_zdfhsfunzua165() __attribute__((constructor));
static void stginit_export_Test_zdfhsfunzua165()
{getStablePtr((StgPtr) &Test_zdfhsfunzua165_closure);}
#ifdef __cplusplus
}
#endif
然后创建一个cpp文件main.cpp:
#include "Test_stub.h"
#include <iostream>
using namespace std;
int main()
{
cout << hsfun(5);
}
并且想要编译和链接它。但是当我调用g++时,它会说:
$ g++ -I/usr/lib/ghc-7.0.3/include -L. -lTest main.cpp
/tmp/ccFP2AuB.o: In function `main':
main.cpp:(.text+0xa): undefined reference to `hsfun'
collect2: ld gab 1 als Ende-Status zurück
因此,我在命令行中添加了Test_stub.o文件(尽管我认为hsfun函数应该已经在libTest.so中定义了,它是通过-lTest参数添加的。我认为,我不应该将Test_stub.o文件链接到可执行文件中,因为我想使用动态链接),但这也不起作用:
$ g++ -I/usr/lib/ghc-7.0.3/include -L. -lTest main.cpp Test_stub.o
Test_stub.o: In function `hsfun':
Test_stub.c:(.text+0x9): undefined reference to `rts_lock'
Test_stub.c:(.text+0x16): undefined reference to `rts_mkInt32'
Test_stub.c:(.text+0x1d): undefined reference to `Test_zdfhsfunzua165_closure'
Test_stub.c:(.text+0x28): undefined reference to `rts_apply'
Test_stub.c:(.text+0x2f): undefined reference to `base_GHCziTopHandler_runIO_closure'
Test_stub.c:(.text+0x3a): undefined reference to `rts_apply'
Test_stub.c:(.text+0x4a): undefined reference to `rts_evalIO'
Test_stub.c:(.text+0x5c): undefined reference to `rts_checkSchedStatus'
Test_stub.c:(.text+0x66): undefined reference to `rts_getInt32'
Test_stub.c:(.text+0x70): undefined reference to `rts_unlock'
Test_stub.o: In function `stginit_export_Test_zdfhsfunzua165':
Test_stub.c:(.text.startup+0x3): undefined reference to `Test_zdfhsfunzua165_closure'
Test_stub.c:(.text.startup+0x8): undefined reference to `getStablePtr'
collect2: ld gab 1 als Ende-Status zurück
我必须链接Test_stub.o吗?若有,原因为何?我应该将哪些参数传递给链接器?
发布于 2012-01-01 04:25:04
可能比与g++角力更容易的是让ghc来做这项工作,
ghc main.cpp -o hithere .-lTest -lstdc++
用你创建共享库的方式为我完成了这项工作。我已经用7.2.2和7.0.2进行了测试,这两个版本都可以在这里工作。
https://stackoverflow.com/questions/8690049
复制相似问题