D Linking library behaviour

[bioinfornatics]

Hi,

I see a problem with ldc and maybe other compiler as the same
problem. When I create a library as :

--------------- libFoo.d ---------------
size_t add( size_t a , size_t b ){ return a + b ; }
----------------------------------------

----------------- Terminal -------------

$ ldc2 -shared libFoo.d -of libFoo.so.1 -soname=libFoo.so.1
$ ldd libFoo.so.1
      linux-vdso.so.1 =>  (0x00007fff14000000)
      libphobos-ldc.so.59 => /lib64/libphobos-ldc.so.59
(0x00007fb01a820000)
      librt.so.1 => /lib64/librt.so.1 (0x00007fb01a618000)
      libdl.so.2 => /lib64/libdl.so.2 (0x00007fb01a410000)
      libpthread.so.0 => /lib64/libpthread.so.0 
(0x00007fb01a1f0000)
      libm.so.6 => /lib64/libm.so.6 (0x00007fb019ef0000)
      libc.so.6 => /lib64/libc.so.6 (0x00007fb019b38000)
      libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fb019920000)
      /lib64/ld-linux-x86-64.so.2 (0x0000003e6c000000)

----------------------------------------

libFoo library got some extra link which will never be used by
libFoo as:
- librt
- libpthread
- libm
- libc

I have try to said to the linker to use only link needed with:
----------------- Terminal -------------
$ ldc2 -shared libFoo.d -of libFoo.so.1 -soname=libFoo.so.1
-L--as-needed
----------------------------------------

--as-needed flag seem to be used in this case
http://tinyurl.com/bfbuhpx

but it do not remove these extra link maybe they are hardcoded.

So i would like to know:
- if other compiler has same beehaviour ?
- if --as-needed flag is safe ?