cmake: initial version of luzer module

The patch add a CMake module that builds a luzer [1],
a coverage-guided, native Lua fuzzing engine.

Needed for the following commit.

1. https://github.com/ligurio/luzer

Author: ligurio

cmake/BuildLuzer.cmake

@@ -0,0 +1,61 @@
+set(LUZER_DIR ${PROJECT_BINARY_DIR}/luzer)
+set(LUZER_BUILD_DIR ${LUZER_DIR}/build)
+set(LUZER_LIBRARY_PATH ${LUZER_BUILD_DIR}/luzer)
+list(APPEND LUZER_LIBRARIES
+    ${LUZER_LIBRARY_PATH}/luzer/luzer.so
+    ${LUZER_LIBRARY_PATH}/luzer/libcustom_mutator.so
+)
+
+include(ExternalProject)
+
+get_target_property(LUA_LIBRARIES_LOCATION ${LUA_LIBRARIES} LOCATION)
+
+list(APPEND LUZER_CMAKE_FLAGS
+    "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
+    "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+    "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
+    "-DLUA_INCLUDE_DIR=${LUA_INCLUDE_DIR}"
+    "-DLUA_LIBRARIES=${LUA_LIBRARIES_LOCATION}"
+)
+if(USE_LUAJIT)
+    list(APPEND LUZER_CMAKE_FLAGS
+        "-DLUAJIT_FRIENDLY_MODE=ON"
+        "-DLUA_HAS_JIT=ON"
+    )
+endif()
+
+ExternalProject_Add(bundled-luzer
+    GIT_REPOSITORY https://github.com/ligurio/luzer
+    GIT_TAG 82d41c5f350296ca351e785a24c914165a0e8033
+    GIT_PROGRESS TRUE
+    GIT_SHALLOW FALSE
+    SOURCE_DIR ${LUZER_DIR}/source
+    BINARY_DIR ${LUZER_BUILD_DIR}
+    TMP_DIR ${LUZER_DIR}/tmp
+    STAMP_DIR ${LUZER_DIR}/stamp
+    CONFIGURE_COMMAND
+        ${CMAKE_COMMAND} -B <BINARY_DIR> -S <SOURCE_DIR>
+            -G ${CMAKE_GENERATOR} ${LUZER_CMAKE_FLAGS}
+    BUILD_COMMAND cd <BINARY_DIR> && ${CMAKE_MAKE_PROGRAM}
+    INSTALL_COMMAND ""
+    CMAKE_GENERATOR ${CMAKE_GENERATOR}
+    BUILD_BYPRODUCTS ${LUZER_LIBRARIES}
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+)
+
+add_library(luzer-library STATIC IMPORTED GLOBAL)
+set_target_properties(luzer-library PROPERTIES
+  IMPORTED_LOCATION "${LUZER_LIBRARIES}")
+add_dependencies(luzer-library bundled-luzer)
+add_dependencies(bundled-luzer bundled-liblua)
+
+set(LUZER_LUA_PATH ${LUZER_DIR}/source/?/init.lua)
+set(LUZER_LUA_PATH ${LUZER_LUA_PATH} PARENT_SCOPE)
+
+set(LUZER_LUA_CPATH ${LUZER_LIBRARY_PATH}/?${CMAKE_SHARED_LIBRARY_SUFFIX})
+set(LUZER_LUA_CPATH ${LUZER_LUA_CPATH} PARENT_SCOPE)
+
+set(LUZER_LIBRARY luzer-library PARENT_SCOPE)
+
+unset(LUZER_DIR)
+unset(LUZER_BUILD_DIR)