[lldb-dev] lldb-server link failure with shared library configuration

[Tamas Berghammer via lldb-dev]

Hi All,

We are trying to keep the size of lldb-server as small as possible as it
have to be copied over to the android device for every debug session. The
way we currently achieve this is by using linker garbage collection to get
rid of the unused code.

In the log term it would be nice to be more explicit about the list of
dependencies but currently we don't have clear enough boundaries for doing
that. Pavel and Zachary spent some time on improving it but I think we are
still quite far from that.

For your problem I think a better short term option would be to add
LLVMRuntimeDyld as a dependency for lldbExpression instead of lldb-server
directly (assuming it works). Optionally if you are feeling more
adventurous you can try to replace ${LLDB_PLUGINS} and ${LLDB_SYSTEM_LIBS}
with a more explicit list of dependencies what might remove the dependency
between lldb-server and LLVMRuntimeDyld but I am not certain.

Tamas

On Mon, Aug 28, 2017 at 6:00 PM Greg Clayton via lldb-dev <
lldb-dev at lists.llvm.org> wrote:

> If we are pulling in the expression parser, that would explain our issues.
> If this currently happens in lldb-server we need to add LLVMRuntimeDyld to
> the link libraries. I know some people at Google have looked into getting
> lldb-server to link against as little as possible, and maybe this is just
> how things are for the time being. We should verify that. It would be nice
> if lldb-server didn't link against the expression parser if possible.
>
> Greg
>
> On Aug 28, 2017, at 9:56 AM, Peeter Joot <peeterjoot at protonmail.com>
> wrote:
>
> Hi Greg,
>
> IRExecutionUnit.cpp looks like the origin of at least some of the
> undefined symbols:
>
> .../llvm/include/llvm/ExecutionEngine/RTDyldMemoryManager.h:61: undefined
> reference to `vtable for llvm::RTDyldMemoryManager'
>
>
> .../llvm/include/llvm/ExecutionEngine/JITSymbol.h:223: undefined reference
> to `vtable for llvm::JITSymbolResolver'
>
>
> .../llvm/include/llvm/ExecutionEngine/RuntimeDyld.h:96: undefined
> reference to `vtable for llvm::RuntimeDyld::MemoryManager'
>
>
> lib/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro+0x90):
> undefined reference to `llvm::RTDyldMemoryManager::deregisterEHFrames()'
>
> lib/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro+0xa8):
> undefined reference to `llvm::RuntimeDyld::MemoryManager::anchor()'
>
> lib/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro+0x118):
> undefined reference to `llvm::JITSymbolResolver::anchor()'
>
> lib/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTVN4llvm18MCJITMemoryManagerE[_ZTVN4llvm18MCJITMemoryManagerE]+0x60):
> undefined reference to `llvm::RuntimeDyld:
>
> :MemoryManager::anchor()'
>
> there are a couple of undefined vtable references in headers (also above),
> but it's not clear to me if these also neccessarily come from
> IRExectionUnix.cpp.
>
> --
> Peeter
>
>
>
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