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

[octoploid at yandex dot com]

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_
lib/libLLVMCore.so:
0000000000071e90 W
_ZN4llvm21SymbolTableListTraitsINS_10BasicBlockENS_8FunctionEE21transferNodesFromListERNS_12ilist_traitsIS1_EENS_14ilist_iteratorIS1_EES8

Later they get linked together:
... -o bin/llvm-as lib/libLLVMAsmParser.so ... lib/libLLVMCore.so  ...

In the lto case the weak symbol in lib/libLLVMCore.so is optimized out
and the build fails. 

lib/libLLVMCore.so normally gets this weak symbol from BasicBlock.ii and
Function.ii, that I've attached above.

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