report_duplicate() function in buildtools/wafsamba/symbols.py is only called during running tests, so I opened the issue here; if I am wrong, then sorry and please feel free to correct me. The list of "safe" to be duplicated symbols is highly platform-dependent. Here are some additions from OpenBSD, in a few groups. I'm not an expert at linker and compiler internals, so I could be wrong somewhere, of course. ld.so-specific hooks: __data_start __data_end __got_start __got_end C++-specific hooks for libc: __cxa_atexit __cxa_finalize GCC CRT specifics named "java class registration hooks" (WTF?! - I don't know, either): _Jv_RegisterClasses Hardware-specific: __clear_cache Old threading library compatibility goo: __gthread_active_p __gthread_mutex_lock __gthread_mutex_unlock Other symbols added by GCC (yes, such much; no, I don't know why do they show up here and not there): _Unwind_Backtrace _Unwind_DeleteException _Unwind_FindEnclosingFunction _Unwind_Find_FDE _Unwind_ForcedUnwind _Unwind_GetCFA _Unwind_GetDataRelBase _Unwind_GetGR _Unwind_GetIP _Unwind_GetIPInfo _Unwind_GetLanguageSpecificData _Unwind_GetRegionStart _Unwind_GetTextRelBase _Unwind_RaiseException _Unwind_Resume _Unwind_Resume_or_Rethrow _Unwind_SetGR _Unwind_SetIP __absvdi2 __absvsi2 __addvdi3 __addvsi3 __ashldi3 __ashrdi3 __clzdi2 __clzsi2 __cmpdi2 __ctzdi2 __ctzsi2 __deregister_frame __deregister_frame_info __deregister_frame_info_bases __divdc3 __divdi3 __divsc3 __divxc3 __ffsdi2 __ffssi2 __fixdfdi __fixsfdi __fixunsdfdi __fixunsdfsi __fixunssfdi __fixunssfsi __fixunsxfdi __fixunsxfsi __fixxfdi __floatdidf __floatdisf __floatdixf __floatundidf __floatundisf __floatundixf __frame_state_for __gcc_personality_v0 __gnat_default_lock __gnat_default_unlock __gnat_install_locks __lshrdi3 __moddi3 __muldc3 __muldi3 __mulsc3 __mulvdi3 __mulvsi3 __mulxc3 __negdi2 __negvdi2 __negvsi2 __paritydi2 __paritysi2 __popcountdi2 __popcountsi2 __powidf2 __powisf2 __powixf2 __register_frame __register_frame_info __register_frame_info_bases __register_frame_info_table __register_frame_info_table_bases __register_frame_table __subvdi3 __subvsi3 __ucmpdi2 __udiv_w_sdiv __udivdi3 __udivmoddi4 __umoddi3 Some or all of those could be probably added to the list of "safe" symbols. I want to discuss, what precisely, and then (if agreed) I'll prepare and send a patch.