cmake: introduce IS_LUAJIT

The patch introduce a CMake flag `IS_LUAJIT` that should be
enabled when passed `LUA_LIBRARIES` and `LUA_INCLUDE_DIR` point to
a LuaJIT implementation.

Required for setting a Lua library outside.

Author: ligurio

CMakeLists.txt

@@ -32,7 +32,7 @@ set(CMAKE_INCLUDE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_INCLUDE_PATH}
 include(SetBuildParallelLevel)
 include(SetHardwareArch)
 
-if (ENABLE_LUAJIT_RANDOM_RA AND NOT USE_LUAJIT)
+if (ENABLE_LUAJIT_RANDOM_RA AND NOT IS_LUAJIT)
   message(FATAL_ERROR "Option ENABLE_LUAJIT_RANDOM_RA is LuaJIT-specific.")
 endif()
 
@@ -50,6 +50,7 @@ if (USE_LUA)
 elseif (USE_LUAJIT)
   include(BuildLuaJIT)
   build_luajit(${LUA_VERSION})
+  set(IS_LUAJIT TRUE)
 else ()
   message(FATAL_ERROR "No Lua is specified.")
 endif ()

cmake/CodeCoverage.cmake

@@ -36,7 +36,7 @@ if(USE_LUA)
   set(GCOVR_OPTIONS ${GCOVR_OPTIONS} --object-directory ${LUA_SOURCE_DIR})
 endif ()
 
-if(USE_LUAJIT)
+if(IS_LUAJIT)
   # Exclude DynASM files, that contain a low-level VM code for CPUs.
   set(GCOVR_OPTIONS ${GCOVR_OPTIONS} --exclude ".*\.dasc")
   # Exclude buildvm source code, it's a project's build infrastructure.
@@ -56,7 +56,7 @@ add_custom_command(TARGET ${target_name}
 # object files built with the GCC -fprofile-arcs option is executed.
 # https://gcc.gnu.org/onlinedocs/gcc/Gcov-Data-Files.html
 set(GCDA_FILES "${LUA_SOURCE_DIR}/*.gcda")
-if(USE_LUAJIT)
+if(IS_LUAJIT)
   # Files 'src/host/*.gcda' are not removed, because
   # CMake cannot remove recursively by globbing.
   # Files 'src/host/*.gcda' are not used for building coverage report.

tests/capi/CMakeLists.txt

@@ -74,10 +74,10 @@ function(create_test)
   add_dependencies(${test_name} ${LUA_LIBRARIES})
   string(REPLACE "_test" "" test_prefix ${test_name})
   set(LIBFUZZER_OPTS "${LIBFUZZER_OPTS} -artifact_prefix=${test_name}_")
-  if (USE_LUAJIT AND (${test_name} STREQUAL "lua_dump_test"))
+  if (IS_LUAJIT AND (${test_name} STREQUAL "lua_dump_test"))
     set(LIBFUZZER_OPTS "${LIBFUZZER_OPTS} -only_ascii=1")
   endif ()
-  if (USE_LUAJIT AND (${test_name} STREQUAL "lua_load_test"))
+  if (IS_LUAJIT AND (${test_name} STREQUAL "lua_load_test"))
     set(LIBFUZZER_OPTS "${LIBFUZZER_OPTS} -only_ascii=1")
   endif ()
   set(dict_path ${PROJECT_SOURCE_DIR}/corpus/${test_name}.dict)
@@ -101,7 +101,7 @@ function(create_test)
     LABELS capi
   )
 
-  if (USE_LUAJIT)
+  if (IS_LUAJIT)
     target_compile_definitions(${test_name} PUBLIC LUAJIT)
   endif()
 endfunction()
@@ -121,7 +121,7 @@ list(APPEND LUAJIT_BLACKLIST_TESTS "luaL_loadstring_test")
 file(GLOB tests LIST_DIRECTORIES false ${CMAKE_CURRENT_SOURCE_DIR} *.c *.cc)
 foreach(filename ${tests})
   get_filename_component(test_name ${filename} NAME_WE)
-  if (USE_LUAJIT AND (${test_name} IN_LIST LUAJIT_BLACKLIST_TESTS))
+  if (IS_LUAJIT AND (${test_name} IN_LIST LUAJIT_BLACKLIST_TESTS))
     continue()
   endif ()
   if ((${test_name} IN_LIST BLACKLIST_TESTS))
@@ -134,6 +134,6 @@ endforeach()
 
 include(ProtobufMutator)
 add_subdirectory(luaL_loadbuffer_proto)
-if(USE_LUAJIT)
+if(IS_LUAJIT)
   add_subdirectory(ffi_cdef_proto)
 endif ()