g++ vs clang++: odd behavious
 

Hello Forum,

I'm come across a very strange issue affecting GCC.

If I compile an SO using g++ [0] the library dependencies are totally different than when compiling the same SO with clang++ [1] using the exact same parameters.

I imagine it's something to do with parameter order; can an enlightened guru please shed some light on this?


[0] http://pastebin.com/8Xp9mwwA
[1] http://pastebin.com/xM8NNj4m

I would assume g++ detected those libs are not required, therefore dropped (for example -lpthread).

But the problem is when I run the g++ compiled program it fails due to an undefined symbol (not so with the clang++ version):

out/src/omnis: symbol lookup error: /home/guedesm/prj/omnis/sh/../out/sources/clank/libclank.so: undefined symbol: clang_createIndex


So if the case is it is dropping some libs then it is doing so in error.

Could it be some other reason perhaps?

My guess is that libomnis.a is completely left out from the shared object.

Perhaps:

PS: I think using libtool wouldn't be a bad idea.

AFAIK, g++ and clang++ each uses its own standard C++ library coming with each of the compilers.