On Jan 13, 2010, at 00:57 , DNM wrote:
------------- srilm.c ---------------- // Initialize and read in the ngram model Ngram* bldLM(int order, const char* filename) { ... } ... // Delete the ngram model void deleteLM(Ngram* ngram) { delete srilm_vocab; delete ngram; } ... // Get the ngram probability of the given string, given n-gram order 'order' and string length // 'length'. float getSeqProb(Ngram* ngram, const char* ngramstr, unsigned order, unsigned length) { ...} -----------------------------
I think you need to `#include "srilm.h"' in the above, so C++ knows to export the functions with names callable from outside of C++. When you define a function in C++, the actual function symbol defined contains parameter type information unless previously declared in an extern "C" declaration.) While you've named the file with a .c extension, you have used C++-specific content (// comments, "delete" keyword) so I expect the file was compiled in C++ mode; otherwise it should have produced a syntax error from "delete" ("//" comments are a common enough extension that by themselves they probably work in much C code) and as a result the function symbols are mangled. If you add the #include, you bring the extern "C" declarations in scope, and C++ should produce non-mangled function definitions, which should be callable from Haskell. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH