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# CMake build system
KLEE now has a CMake build system which is intended to replace
its autoconf/Makefile based build system.
## Useful top level targets
* `check` - Build and run all tests.
* `clean` - Clean the build tree. Note this won't clean the runtime build.
* `clean_runtime` - Clean the runtime build tree.
* `docs` - Build documentation
* `edit_cache` - Show cmake/ccmake/cmake-gui interface for chaning configure options.
* `help` - Show list of top level targets
* `systemtests` - Run system tests
* `unittests` - Build and run unittests
## 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_UCLIBC` (BOOLEAN) - Enable support for klee-uclibc.
* `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.
* `GTEST_SRC_DIR` (STRING) - Path to GTest source tree.
* `KLEE_ENABLE_TIMESTAMP` (BOOLEAN) - Enable timestamps in KLEE sources.
* `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_CONFIG_BINARY` (STRING) - Path to `llvm-config` binary. This is
only relevant if `USE_CMAKE_FIND_PACKAGE_LLVM` is `FALSE`. This is used
to detect the LLVM version and find libraries.
* `MAKE_BINARY` (STRING) - Path to `make` binary used to build KLEE's runtime.
* `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.
* `USE_CMAKE_FIND_PACKAGE_LLVM` (BOOLEAN) - Use `find_package(LLVM CONFIG)`
to find LLVM.
* `USE_CXX11` (BOOLEAN) - Use C++11.
* `WARNINGS_AS_ERRORS` (BOOLEAN) - Treat warnings as errors when building KLEE.
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