Hello, I'm trying to build some haskell code as a .so/.dll so that it can ultimately be used by msvc. I have it working when I compile by hand (listed below) but I can't get the exact same thing built/linked with cabal. On linux everything builds fine, but when I try to link the resulting .so file, I get an error about a missing '__stginit_CInterface' reference. Indeed I couldn't find that name in any of the cabal-generated .dyn_o files. I checked the output of 'cabal build -v' and it seems to be executing about the same thing that I'm executing manually so I'm not sure what could be going wrong. On windows cabal won't even configure since '--enable-shared' seems to imply '-dynamic' (right?), and that's not currently supported. Also, when I remove the line 'hs_add_root(__stginit_CInterface);', and the corresponding forward declaration, the program runs fine! Does ghc no longer need this call or are my toy programs just being lucky sofar? Cheers, - Anthony LODI ========================================= (archlinux32 -- 2.6.32)
hsc2hs CInterface.hsc
ghc --make CInterface
cat dll_init.h
#pragma once extern void __stginit_CInterface(void); extern void sp_init(int*, char***); extern void sp_exit(void);
cat dll_init.c
#include "HsFFI.h" #include "dll_init.h" void sp_init(int* p_argc, char*** p_argv) { hs_init(p_argc, p_argv); hs_add_root(__stginit_CInterface); } void sp_exit(void) { hs_exit(); }
ghc -c dll_init.c
ghc -o libfoo.so -shared -dynamic CInterface.o CInterface_stub.o dll_init.o
ghc -c ctest.c
ghc -threaded -o ctest -L. -lfoo ctest.o -optl-Wl,-rpath,'$ORIGIN'
./ctest
========================================= (winxp is similar except without '-threaded' or '-dynamic') =========================================
cat test.cabal
... library build-depends: base >=4 && <5 exposed-modules: CInterface c-source: dll_init.c ghc_options: -threaded
cabal clean cabal configure --enable-shared cabal build