where is dlopen ?

I'm trying to expand plugin-capabilities of Qt, and
some code refers to dlopen()/dlclose()/dlsym(). The code links, but does not work.

Now I'm trying to make a small test-app that uses
dlopen, but it doesn't link, telling me "undefined reference to
dlopen".

I can't seem to find dlopen as symbol in any of the SDK libraries, so how come Qt links? If there is some macro definition somewhere, I can't find it. Help!

@alfkil

You don't add -ldl, you just link using -use-dynld, simply add to the start of the command line (after the linker/compiler) when linking.

That makes your program use any shared libraries you have. If you don't want that, you have 2 options. You can either delete/rename the shared libs, leaving only the static ones to find, or "libdl" on OS4Depot might work.

@MickJT

Thanks. libdl seems to be exactly what I need!

@alfkil

The SDK I have (v 53.20 I think) has DLOpen (and others) in elf.library.

@jaokim

They are not directly compatible though, which is why you still need libdl. Mine is a little wrapper, I think there is one included with the SDK these days along with the dlfcn.h header, and it is probably better to use that instead of mine. I have a static version though which might be better in some circumstances (SDK only has .so IIRC)

@Chris

I needed the static version, because Qt cannot build with -use-dynld at this time. Sadly.

There is a bug in elf.library, though, that makes dlopen() crash with my plugins.

@alfkil
I use for LodePaint such strings, which allow me to use plugins with:

- for main program:
Quote:

- for the plugin:
Quote:

Only in that way plugins works for me. In others - it crashes on dlopen as well as for you.

@kas1e

Thanks for the info

I'll see if I can use it, only rebuilding libQtGui takes almost half a day... :(