[Bug ipa/59469] [4.8/4.9 Regression] LLVM build failure with gcc LTO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59469

--- Comment #20 from Jan Hubicka <hubicka at ucw dot cz> ---
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59469
> 
> --- Comment #17 from Markus Trippelsdorf <octoploid at yandex dot com> ---
> In the non-lto case one has:
> lib/libLLVMAsmParser.so:
> U
> _ZN4llvm21SymbolTableListTraitsINS_10BasicBlockENS_8FunctionEE21transferNodesFromListERNS_12ilist_traitsIS1_EENS_14ilist_iteratorIS1_EES8_

I think this is a bug by itself, since the symbol seems to be nonkeyed comdat
and thus
every unit that use it should define it.

> If I understand you correctly, you say that the undefined symbol
> of lib/libLLVMAsmParser.so is a bug in LLVM.

I think it is eitehr bug in source (LLVM). Most probably becuase
libLLVMAsmParser simply omits inline definition in libLLVMAsmParser.so where it
should not or some sort of bug in C++ visibility logic.

For that we need to figure out how the symbol is defined and used in
lib/libLLVMAsmParser.so

Honza