[Bug-gsl] GSL for windows usage

[perfectShaka]

I tried it with VC7.0 and BC++ 6 but the dlls couldn't
fully work ...








VC7.0
------

it seems that the include file gsl_types.h don't
correctly redirect this two defines :
GSL_VAR and GSL_EXPORT

I came to conclusion that this lines are valids
#  define GSL_VAR extern
#  define GSL_EXPORT

but if you want to use globals variables from DLL, you
must have these
#      define GSL_VAR extern __declspec(dllimport)

Did I miss an option ? Otherwise, variables are not
good linked and program crash with their use.






BC++ 6
-------

It's a bit more complicated here ...

First, we have to redefine GSL_VAR and GSL_EXPORT like
with VC7




-       problems with functions :

The problem with exported functions is that BCC
imports dll functions with the default convention(
Cdecl by default )
so I had to switch to stdcall convention.

One other solution is too add __stdcall before each
functions but it as a special place so we have to
reformat the prototype
or else it won't work :

GSL_EXPORT gsl_rng *gsl_rng_alloc (const gsl_rng_type
* T);

=>

GSL_EXPORT gsl_rng *__stdcall gsl_rng_alloc (const
gsl_rng_type * T);





-       problems with variables :
        BC++ automaticly add underscores before each global
imported variable !
        I had to modify it the exports.def and re-make the
libgsl-bcc.lib like this :

        gsl_rng_default
        =>
        _gsl_rng_default=gsl_rng_default*
        
        (see the joined exports.def)
        
        with command line : implib libgsl-bcc libgsl.def
libgsl.dll





I believe this would help a bit other developpers ...

good luck !


        

        
                
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