Re: 回复： Re: Problem calling c++ from Lua (MS-Windows version)

[Michael Gogins <michael.gogins@...>]

It is also useful to know that dependency walker can profile a running
program. In this case, that would be the Lua runtime, with command
line arguments specifying the script to run. I always enable full
paths in the trace messages so I can see where the program is actually
loading libraries from.

On Thu, Feb 24, 2011 at 12:38 PM, Jerome Vuarand
<jerome.vuarand@gmail.com> wrote:
> 2011/2/24 jseb <gmane2010@finiderire.com>:
>>> Rename luaopen_libido to luaopen_foo
>>
>> Thanks for the suggestion
>>
>> "libido" ... that's a nice lapsus :)
>>
>> Anyway, it was not working either.
>>
>>
>> Finally, i've found it:
>>
>> I was launching the lua interpreter on MSYS or in CMD (windows shell): same
>> error with both of them.
>>
>> Then i tried to write a little script (just the "require" on my lib) and
>> then , launched it directly via "windows explorer". I've got an error of a
>> missing dll this time.
>> So... the answer after a few googling:
>>
>> with mingw, compile it with flag "-static-libgcc"
>>
>> No idea how to manage this with Visual Studio.
>>
>> Now the "require" work , whatever environment: MSYS, CMD, and "windows
>> explorer".
>>
>> Windows mysteries :/
>
> A very useful tool to debug such DLL problems is Dependency Walker
> [1]. It can tell you what dependencies a DLL has (and it displays
> warning if it's unable to find them). It is also useful to examine
> exported symbols, and check that your luaopen_foo is properly named
> and not mangled.
>
> And to find out why -static-libgcc solves the problem, and how to
> solve it with MSVC, you will have to provide more details, such as
> what DLL exactly is reported missing, what unusual things you might
> have in your PATH, or whether you may have several foo.dll files in
> the PATH (for example one for the C/C++ library, and one for the Lua/C
> binding module).
>
> [1] http://www.dependencywalker.com/
>
>



-- 
Michael Gogins
Irreducible Productions
http://www.michael-gogins.com
Michael dot Gogins at gmail dot com