Re: [Haskell-cafe] Re: Wikipedia on first-class object

You are right, Portable Haskell Dynamic libraries do not exist because the Haskell standard does not talk about them at all. Portable C Dynamic libraries do not exist either. Given POSIX they exist, but if you happen upon a platform that only has a C compiler it won't have them. On Dec 28, 2007 7:08 PM, Cristian Baboi wrote:

On Fri, 28 Dec 2007 19:18:33 +0200, ChrisK wrote:

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This thread is obviously a source of much fun. I will play too.

Well, it starts with Wikipedia ... :-)

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What is the definition of an entry point in Haskell ?

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"Haskell" does not have such a concept. At all. An implementation may have such a concept.

Then a Haskell module know nothing about them.

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Most people on this list define "Haskell" as any attempt at an implementation of one of the standards which define Haskell, most recently the Hakell 98 standard.

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This can be nhc / yhc / ghc / hugs / winhugs / helium / jhc. Some of these compile to native code, some compile to byte code for a virtual machine. If an implementation can compile separately, then it might support dynamic libraries. If so then a specific version of that compiler will define its own implementation specific concept of an entry point.

How can one make portable dynamic libraries then ?

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What is the semantics of those entry points ?

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It depends. For recent ghc versions, see its user manual:

http://haskell.org/ghc/docs/latest/html/users_guide/ffi-ghc.html#ffi-library

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http://haskell.org/ghc/docs/latest/html/users_guide/win32-dlls.html

The conclusion:

Portable Haskell Dynamic libraries does not exists.

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