Thomas Schilling wrote:
On 26 feb 2008, at 09.38, Roman Leshchinskiy wrote:
What is the simplest way to build a Haskell project that uses a C++ library? It needs at least the following from Cabal.
- It must know how to compile C++ files. This kind of works by accident if I list those under c-sources since gcc knows what to do with them but this is (a) ugly and (b) doesn't allow me to pass C++-specific options to gcc.
- The project must be linked with g++. However, I don't understand how to tell Cabal which linker to use. I got as far as
main = defaultMainWithHooks $ defaultUserHooks { hookedPrograms = [Program "ld" (findProgramOnPath "g++") (\_ _ -> return Nothing)]
but this doesn't seem to work. configure --with-ld=g++ does, but it's not nice.
I don't think you need to link with g++. I successfully linked to a C++ library by adding -fexceptions to the linker options. I used a makefile, but this should work with Cabal as well.
Constructors for static objects won't get run unless you link with g++ (which, IIRC, uses collect2 for linking). Just adding -fexceptions isn't enough. As a matter of fact, what I'd really want is to use the standard C++ compiler for linking, whatever that is. Roman