The module 'foo' is already defined in 'libmylib.so'

[Nicholas Wilson via Digitalmars-d-learn]

On Thursday, 1 December 2016 at 22:05:06 UTC, Timothee Cour wrote:
> I want to update a library with new symbols (ie partial 
> recompilation):
>
> libmylib.so : compiled from bar.d and foo.d
>
> now update the file foo.d
>
> dmd -c -fPIC foo.d -offoo.o
>
> clang++ -o libmylib_update.so foo.o -shared -Wl,-lmylib
>
> When trying to dlopen libmylib_update.so from C++ it fails 
> with: The module 'foo' is already defined in 'libmylib.so'
>
> (it somehow works when the dlopen is called from D)
>
> How would I achieve that?

Have a look at what `trace -E d_executable args` and `trace -E 
c++_executable args`
print on startup and grep for dlopen calls and the like.