Re: [Haskell-cafe] A question regarding reading CPP definitions from a C header

Carl, thank you very much. This is exactly what I was looking for, and it solved my problem in 5 minutes. What's awesome is that when Cabal finds a .hsc file it automatically calls this tool. Great. Thanks again. --- Ömer Sinan Ağacan http://osa1.net 2013/10/8 Carl Howells :

Have you looked into using hsc2hs? If I understand your problem, it's designed exactly to solve it.

-- Carl

On Mon, Oct 7, 2013 at 12:20 PM, Ömer Sinan Ağacan wrote:

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Thanks for your answer, looks like this is my only option to do this.

Can you provide some information about what does parameters of runCpphsReturningSymTab stands for? I made several attempts but couldn't get any useful return value.

For example, I have no idea what does third parameter does. Also, second parameter.

Thanks,

--- Ömer Sinan Ağacan http://osa1.net

2013/10/7 Malcolm Wallace :

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If you use cpphs as a library, there is an API called runCpphsReturningSymTab. Thence you can throw away the actual pre-preprocessed result text, keep only the symbol table, and lookup whatever macros you wish to find their values. I suggest you make this into a little code-generator, to produce a Haskell module containing the values you need.

On 5 Oct 2013, at 21:37, Ömer Sinan Ağacan wrote:

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Hi all,

Let's say I want to #include a C header file in my Haskell library just to read some macro definitions. The C header file also contains some C code. Is there a way to load only macro definitions and not C code in #include declarations in Haskell?

What I'm trying to do is I'm linking my library against this C library but I want to support different versions of this C library, so I want to read it's version from one of it's header files. The problem is the header file contains some C code and makes my Haskell source code mixed with C source before compilation.

Any suggestions would be appreciated,

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