[lldb-dev] LLDB fails to load C++ Plugin (sharedlib) - error: this file does not represent a loadable dylib

[Pavel Labath via lldb-dev]

I would expect the issue is that dlopen fails to locate the dependent
libraries of your plugin. Can you lookup the actual dlopen call which
opens your library and see what is the exact error it fails with?
On Fri, 8 Jun 2018 at 10:52, Bewoayia Kebianyor via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
>
> Hello Everyone,
>
> I started looking into the LLDB with the intention of adding custom commands for my SW debugging purpose. For a better Understanding let me explain what I intend to do. I have an source file generated automatically from a Model with certain anotations added as comments in the code. This code will would be compiled and in error cases debugged. When debugging I may have to set breakpoints at certain statements in the code based on the anotations incerted by the code generator. This is done by specifying the source file and the line number. I Use CLANG to get the line number and source file for the comments.
>
> I would like to have custom commands for this and internally map the to already existing commands  e.g. "breakpoint set -f -l". I found some examples for python, and for c++ I only found the example "lldb/examples/plugins/commands/fooplugin.cpp" for writing C++ plugin (dynLib) shipped with the LLDB source. In this example adding a new commands was straight forward and in the DoExecute function, I call the interpreter to handle a breakpoint command. I intend to use C++ rather than Python.
>
> This works fine for a simple shared lib (Simple modification of the Example provided in LLDB. In Do execute call interpreter to handle a breakpoint command). However if I add other C++ sources which does XML parsing, CLANG RecursiveASTVisitor etc to the Library, creating the shared library with eclipse is sucessful. I can link the created library to an application and it works well. However when I load this in lldb with the command ==> plugin load  "/home/bkebianyor/eclipse-workspace/Model_LLDB_Debugger/Debug/libModel_LLDB_Debugger.so", I get the error message: "error: this file does not represent a loadable dylib".
>
>
> #Loading the shared lib that is linked just to the liblldb.so - SUCESSFUL
> (lldb)
> (lldb) plugin load  /home/bkebianyor/eclipse-workspace/DynLib/Debug/libDynLib.so
> (lldb)
>
> #Loading the shared lib that is linked just to the liblldb.so + libxerces-c-3.2.so - FAILS
>
> (lldb) plugin load  "/home/bkebianyor/eclipse-workspace/Model_LLDB_Debugger/Debug/libModel_LLDB_Debugger.so"
> error: this file does not represent a loadable dylib
>
> I have searched for this error on google, but could not find out how to resolve this error. Most answers pointed to a mismatch of the lldb version in the shared lib to be loaded and that linked to lldb, but that is not my case. I am using lldb-5.0.2 and LLVM/CLANG 5.0.2 toolcahin on Linux 16.04.1-Ubuntu and Eclipse IDE. LLVM was built with SHARED_LIBS set to ON.
>
> Would be grateful for an answer.
>
>
> Thanks and Regards,
>
> Bewoayia
>
> -------------
> Dipl.- Ing. Bewoayia Kebianyor
> Researcher - Hardware/Software Design Methodology Group
>
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