Send Beginners mailing list submissions to
beginners@haskell.org
To subscribe or unsubscribe via the World Wide Web, visit
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
or, via email, send a message with subject or body 'help' to
beginners-requ...@haskell.org
You can reach the person managing the list at
beginners-ow...@haskell.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Beginners digest..."
Today's Topics:
1. Linking C++ in Cabal (Leonhard Applis)
----------------------------------------------------------------------
Message: 1
Date: Sun, 24 May 2020 16:30:22 +0000
From: Leonhard Applis <leonhard.app...@protonmail.com>
To: "beginners@haskell.org" <beginners@haskell.org>
Subject: [Haskell-beginners] Linking C++ in Cabal
Message-ID:
<51wOfngyX74dYjJRw6hibqw07vGHvvSYPD_f3f2-_F7hG0k0GwWf2Xv4g7LyeZNyn_vR28s6GIbd3e-78_TapNIEo_tJZ-2fTViOmkQYOnM=@protonmail.com>
Content-Type: text/plain; charset="utf-8"
Hello,
I want to use a foreign C++ Function in a Haskell Library, and the Library in a
Haskell Program.
The C++ function is separate in a file and I have a header file.
I made a minimal reproducing repository.
The closes I have found is this repository which wraps the c++ in c and makes a
full library, needing a makefile etc.
So while I think I'd get it working like that, it looks to be quite a lot to do
for my simple task.
the repository structure looks as follows:
Projekt
- cpp-src
- some.cpp
- some.h
- lib-src
- CPPLib.hs
- program-src
- program.hs
- project.cabal
And my (currently failing) project.cabal the following:
cabal-version: 3.0
name: cpp_lib
[...]
library
exposed-modules: CPPLib
other-extensions: ForeignFunctionInterface
build-depends: base
hs-source-dirs: lib-src
default-language: Haskell2010
include-dirs: ./cpp-src
cxx-sources: ./cpp-src/some.cpp
install-includes: ./cpp-src/some.h
executable CPPApp
main-is: program.hs
default-language: Haskell2010
build-depends: HaskellForeignCPP,
base
hs-source-dirs: program-src
The some.cpp is trivial for this case lets assume its a function multiply ::
Int -> Int -> Int, and both .cpp and .h are well-formed and don't have further
dependencies.
The library compiles fine, but when building the executable it fails telling me
collect2: error: ld returned 1 exit status
`gcc' failed in phase `Linker'. (Exit code: 1)
Can someone help me out?
I find very little documentation on this topic.
I know there is Inline-CPP which would help as well, but I just very much like
the idea of having a nice separate file and interface for modularity.
best
Leonhard
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20200524/9019cbc0/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 477 bytes
Desc: OpenPGP digital signature
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20200524/9019cbc0/attachment-0001.sig>
------------------------------
Subject: Digest Footer
_______________________________________________
Beginners mailing list
Beginners@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
End of Beginners Digest, Vol 143, Issue 12
******************************************
