Daniil Elovkov wrote:
Ok, enough talking to myself :)
If anybody ever wants to build hsql-mysql on windows and has the same
problems as I had, here's how it should be done.
The problem I had seemed to be that libmysql.dll uses stdcall, but
names its functions without @<n> decoration. Thus, when linking a
Haskell program against it, names with @<n> cannot be resolved.
The solution is pretty much a hack. Somebody from the Ruby community
used to run into the same problem, from the same situation -- namely
building ruby mysql bindings.
Here is the procedure one person suggests
http://rubydotnetproxy.rubyforge.org/mysql_win.html
It worked perfectly for me. Of course, with some cabal specifics,
which is obviously not described in the above page.
The solution was to create a def file listing the names which could
not be resolved and creating a .a file based on the dll and this def
file.
GHC adds the @N suffix to any foreign function declared with the stdcall
calling convention, which I think matches what gcc does. I wonder how it
works for C.
Cheers,
Simon
2008/12/24 Daniil Elovkov <[email protected]>:
Mm, actually I didn't change the calling convention ffi imports when I
thought I did. I tried to do it through defines...
Well, by explicitly saying ccall I get the names without @<n>
decoration. And it all links well. But I get segault when I run the
code, which should mean that calling conventions didn't match.
Actually I found some ramblings on the internet that there's something
wrong with libmysql.dll and libmysql.lib in this respect, but they
were from 2004.
Thus the question: how do I link against a lib file in ghc? When I say
-lmysql on command line it strictly searches for dll and complains if
it's not found. Adding lib exlpicitly on the cmd line doesn't seem to
have any effect.
Thanks
2008/12/24 Daniil Elovkov <[email protected]>:
Hello
How is decided whether the name of imported function gets the ending
of the form @4 in ghc?
I'm having this problem on Windows trying to use HSQL MySQL on windows.
I compile HSQL Oracle backend and I get names without that. It's ok.
With HSQL MySQL I get names with that stuff. It prevents me from
further linking to dll. Supplying in the ghc command-line the "lib"
file where names have those marks doesn't have any effect.
The linker says that fn...@nn cannot be resolved.
Can I control that?
The ffi calling convention doesn't (and shouldn't as I understand)
affect this. The only difference is that in the case of mysql the
header file itself where functions are described marks it STDCALL. Is
that the reason?
Also I changed ffi import line from "hsmysql.h func" to just "func",
to no avail.
ghc 6.8.2
I'm lost. Please help.
--
Daniil Elovkov
--
Daniil Elovkov
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