[lldb-dev] LLDB not loading any debug information on windows

[Adrian McCarthy via lldb-dev]

Sorry for the delay.  There's definitely something going wrong here.

If you specify the .pdb file (target symbols add a.pdb), it iterates
through the objfile plugins to see if any match, and none of them do
(because a PDB file is not a "module").

If you specify the .exe file (target symbols add a.exe), it matches an
objfile plugin and creates the symbol vendor, but the symbol vendor says
the symbol file is the .exe itself rather than the .pdb, so it appears to
work but no symbols are actually loaded.

If you specify the .exe with -s (target symbols add -s a.exe), you again
get silent failure as in the previous case.

I'll look at this some more tomorrow to see if I can figure out what this
code path is supposed to be doing.

On Mon, Mar 4, 2019 at 11:00 AM Christoph Baumann via lldb-dev <
lldb-dev at lists.llvm.org> wrote:

> Hey,
>
> in order to try lldb on windows, i built (with clang compiler and lld
> linker (v7.0.1)) llvm, clang, lld and of course lldb from latest source
> with the following command line:
>
>
>
> > cmake -G Ninja -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl
> -DCMAKE_LINKER=lld-link -DLLDB_RELOCATABLE_PYTHON=1
> -DLLDB_PYTHON_HOME=“C:\program files\python37“ -DLLVM_BUILD_TESTS=0
> -DLLVM_BUILD_BENCHMARKS=0 -DLLVM_BUILD_EXAMPLES=0
> -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGET_ARCH=host
> -DCMAKE_INSTALL_PREFIX=“..\release“ ..\src\llvm
>
> >ninja install
>
>
>
> Here my little program i used to test lldb:
>
>
>
> > //main.c
>
> > #include <stdio.h>
>
> >
>
> > int a=10;
>
> >
>
> > int main(int argc, char *argv[]){
>
> >             for(int i=0;i<argc;i++){
>
> >                           printf("%s\n", argv[i]);
>
> >             }
>
> >             return(0);
>
> > }
>
>
>
> I compiled the above with „clang main.c -glldb -o a.exe“, which generated
> the executable a.exe and corresponding debug information a.pdb.
>
> I launched lldb with „lldb a.exe“ and tried to load the debug information
> with „target symbols add a.pdb“, however this resulted in „error: symbol
> file [….]\a.pdb does not match any existing module“.
>
>
>
> I am using Windows 10 pro 64bit, my both, my test program and lldb were
> compiled for x64 target.
>
>
>
> I have also tried the prebuilt llvm/lldb binaries (v8.0.0, v7.0.1) found
> on llvm.org, same result.
>
>
>
> I feel like i am missing something (unless lldb just does not work on
> windows yet).
>
>
>
> (On a sidenote, compiling with -gdwarf-5 makes clang crash. I can send the
> debug information clang spits out once my debug build finishes.)
>
>
>
> Greetings
>
>
> _______________________________________________
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> lldb-dev at lists.llvm.org
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>
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