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# CMake build system
KLEE has a CMake build system.
## Useful top-level targets
* `check` - Build and run all tests.
* `clean` - Clean the build tree.
* `docs` - Build documentation.
* `edit_cache` - Show cmake/ccmake/cmake-gui interface for changing configure options.
* `help` - Show list of top-level targets.
* `systemtests` - Build and run system tests.
* `unittests` - Build and run unit tests.
## Useful CMake variables
These can be set by passing `-DVAR_NAME=VALUE` to the CMake invocation.
e.g.
```
cmake -DCMAKE_BUILD_TYPE=Release /path/to/klee/src
```
* `LLVMCC` (STRING) - Path to the LLVM C compiler (e.g. Clang).
* `LLVMCXX` (STRING) - Path to the LLVM C++ compiler (e.g. Clang++).
* `CMAKE_BUILD_TYPE` (STRING) - Build type for KLEE. Can be
`Debug`, `Release`, `RelWithDebInfo` or `MinSizeRel`.
* `DOWNLOAD_LLVM_TESTING_TOOLS` (BOOLEAN) - Force downloading
of LLVM testing tool sources.
* `ENABLE_DOCS` (BOOLEAN) - Enable building documentation.
* `ENABLE_DOXYGEN` (BOOLEAN) - Enable building doxygen documentation.
* `ENABLE_SYSTEM_TESTS` (BOOLEAN) - Enable KLEE system tests.
* `ENABLE_KLEE_ASSERTS` (BOOLEAN) - Enable assertions when building KLEE.
* `ENABLE_KLEE_EH_CXX` (BOOLEAN) - Enable support for C++ Exceptions.
* `ENABLE_KLEE_LIBCXX` (BOOLEAN) - Enable libc++ for klee.
* `ENABLE_POSIX_RUNTIME` (BOOLEAN) - Enable POSIX runtime.
* `ENABLE_SOLVER_METASMT` (BOOLEAN) - Enable MetaSMT solver support.
* `ENABLE_SOLVER_STP` (BOOLEAN) - Enable STP solver support.
* `ENABLE_SOLVER_Z3` (BOOLEAN) - Enable Z3 solver support.
* `ENABLE_TCMALLOC` (BOOLEAN) - Enable TCMalloc support.
* `ENABLE_UNIT_TESTS` (BOOLEAN) - Enable KLEE unit tests.
* `ENABLE_ZLIB` (BOOLEAN) - Enable zlib support.
* `GTEST_SRC_DIR` (STRING) - Path to Google Test source tree. If it is not
specified, CMake will try to reuse the version included within the LLVM
source tree or find a system installation of Google Test.
* `GTEST_INCLUDE_DIR` (STRING) - Path to Google Test include directory,
if it is not under `GTEST_SRC_DIR`.
* `KLEE_ENABLE_TIMESTAMP` (BOOLEAN) - Enable timestamps in KLEE sources.
* `KLEE_LIBCXX_DIR` (STRING) - Path to directory containing libc++ shared object (bitcode).
* `KLEE_LIBCXX_INCLUDE_DIR` (STRING) - Path to libc++ include directory.
* `KLEE_LIBCXXABI_SRC_DIR` (STRING) - Path to libc++abi source directory.
* `KLEE_UCLIBC_PATH` (STRING) - Path to klee-uclibc root directory.
* `KLEE_RUNTIME_BUILD_TYPE` (STRING) - Build type for KLEE's runtimes.
Can be `Release`, `Release+Asserts`, `Debug` or `Debug+Asserts`.
* `LIT_TOOL` (STRING) - Path to lit testing tool.
* `LIT_ARGS` (STRING) - Semi-colon separated list of lit options.
* `LLVM_DIR` (STRING) - Path to the target LLVM install directory
* `metaSMT_DIR` (STRING) - Provides a hint to CMake, where the metaSMT constraint
solver can be found. This should be an absolute path to a directory
containing the file `metaSMTConfig.cmake`.
* `STP_DIR` (STRING) - Provides a hint to CMake, where the STP constraint
solver can be found. This should be an absolute path to a directory
containing the file `STPConfig.cmake`. This file is installed by STP
but also exists in its build directory. This allows KLEE to link
against STP in a build directory or an installed copy.
* `WARNINGS_AS_ERRORS` (BOOLEAN) - Treat warnings as errors when building KLEE.
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