[Bug 41703] New: LdrUnloadDll is not suit for musl( musl lacks unload support though it has a dlclose())

https://bugs.winehq.org/show_bug.cgi?id=41703

Bug ID: 41703
           Summary: LdrUnloadDll is not suit for musl(musl lacks unload
                    support though it has a dlclose())
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 56111
  --> https://bugs.winehq.org/attachment.cgi?id=56111
fix for this problem

Hey, sorry for my poor english, and here is the problem:

First, musl won't unload module even dlclose(). Check here:
http://wiki.musl-libc.org/wiki/Functional_differences_from_glibc#Unloading_l...

Then, musl won't excute init(__wine_spec_init) function if a module is already
loaded.

That means load_builtin_dll() thought dll is loaded by the current thread since
init function was not called, but actually LdrUnloadDll() destroyed them in
another thread and nothing is loaded in the current thread. Load_builtin_dll()
try to find wm in InLoadOrderModuleList but nothing. After that, app will
crash.

And I solved this by making LdrUnloadDll() a stub. Patch is uploaded as a
attachment. I hope this could be added in official wine by adding a configure
option, thx.

Here's my tracking details on this problem if you're intereted in how i found
this:
https://github.com/xhebox/noname-linux/issues/2#issuecomment-258680745