Skip to content


Folders and files

Last commit message
Last commit date

Latest commit



93 Commits

Repository files navigation


LLDB's machine interface driver.


lldb-mi uses CMake to build. The only dependencies needed for lldb-mi are a C++17 (since LLVM 16) compiler and LLDB itself (including its dependencies: Clang and LLVM). These dependencies should be installed in a way that they can be found via CMake's find_package functionality. You need both the LLDB/Clang/LLVM headers and their compiled libraries for the build to work, but not the respective source files.

Building against system LLDB

If your distribution or operating system already ships a correctly configured LLDB/Clang/LLVM installation, lldb-mi can be built by simply running:

cmake .
cmake --build .

Building against custom LLDB

You can also build lldb-mi against a LLDB that you compiled yourself. For that, compile LLDB as described here but set CMAKE_INSTALL_PREFIX to a local directory and build the LLVM shared library by passing -DLLVM_BUILD_LLVM_DYLIB=On to CMake. Afterwards point towards that prefix directory when building lldb-mi by setting CMAKE_PREFIX_PATH (e.g. cmake -DCMAKE_PREFIX_PATH=/home/yourname/lldb-mi/install).

This example script should build LLVM and lldb-mi on an average UNIX system in the ~/buildspace subfolder:

mkdir buildspace

# Download LLVM/Clang/LLDB and build them.
git clone
mkdir llvm-inst
mkdir llvm-build
cd llvm-build

cmake -DLLVM_ENABLE_PROJECTS="clang;lldb" -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" -DCMAKE_INSTALL_PREFIX=~/buildspace/llvm-inst/ -GNinja ../llvm-project/llvm
ninja install

# Download lldb-mi and build it against our custom installation.
cd ~/buildspace
git clone
cd lldb-mi

# Create a separate build directory for building lldb-mi.
mkdir build
cd build
cmake -DCMAKE_PREFIX_PATH=~/buildspace/llvm-inst/ -GNinja ..

Building against custom LLDB.framework (Darwin Only)

You can also build lldb-mi against a LLDB.framework that you compiled yourself. You follow the same instructions as above but build the LLVM framework by passing -DLLDB_BUILD_FRAMEWORK=1 to CMake instead of using the shared library. Then build lldb-mi with -DUSE_LLDB_FRAMEWORK=1

The snippets below change the CMake calls from the above script.

// Building llvm-project
cmake -DLLVM_ENABLE_PROJECTS="clang;lldb;libcxx;libcxxabi" -DCMAKE_INSTALL_PREFIX=~/buildspace/llvm-inst/ -DLLDB_BUILD_FRAMEWORK=1 -GNinja ../llvm-project/llvm
// Building lldb-mi
cmake -DCMAKE_PREFIX_PATH=~/buildspace/llvm-inst/ -DUSE_LLDB_FRAMEWORK=1 -GNinja ..


On some architectures (e.g. Linux, x86-64), LLDB dynamic library fails to determine its location. That results in the inability to locate a gdbserver stub:

process launch failed: unable to locate lldb-server

The workaround is to set LLDB_DEBUGSERVER_PATH environment variable before running lldb-mi.