Adapt to suggestions

- build shared and/or static version controlled by `LUA_ENABLE_SHARED/STATIC`
- add alias Lua::Lib which is one of above, controlled by `BUILD_SHARED_LIBS`
- exclude the unneeded version if not toplevel

CMakeLists.txt

@@ -3,8 +3,14 @@ project(lua LANGUAGES C VERSION 5.4.4)
 
 option(LUA_SUPPORT_DL "Support dynamic loading of compiled modules" OFF)
 option(LUA_BUILD_AS_CXX "Build lua as C++" OFF)
+option(LUA_ENABLE_SHARED "Build dynamic liblua" ON)
+option(LUA_ENABLE_STATIC "Build static liblua" ON)
 enable_language(CXX)
 
+if(NOT LUA_ENABLE_SHARED AND NOT LUA_ENABLE_STATIC)
+    message(FATAL_ERROR "You must enable at least one of static or dynamic version of liblua")
+endif()
+
 if(${PROJECT_NAME} STREQUAL ${CMAKE_PROJECT_NAME})
     set(TOP_LEVEL TRUE)
 else()

lua-5.4.4/CMakeLists.txt

@@ -33,18 +33,48 @@ set(LUA_LIB_SRCS
     "src/linit.c"
 )
 
+set(TARGETS_TO_INSTALL lua_obj)
+
 if(LUA_BUILD_AS_CXX)
 	set_source_files_properties(${LUA_LIB_SRCS} "src/lua.c" "src/luac.c" PROPERTIES LANGUAGE CXX )
 endif()
 
 add_library(lua_obj OBJECT ${LUA_LIB_SRCS})
 
-add_library(lua_lib)
-target_link_libraries(lua_lib PRIVATE lua_obj)
-set_target_properties(lua_lib PROPERTIES
-    OUTPUT_NAME "lua"
+if(LUA_ENABLE_SHARED)
+    add_library(lua_dynamic SHARED)
+    target_link_libraries(lua_dynamic PUBLIC lua_obj)
+    set_target_properties(lua_dynamic PROPERTIES
         VERSION "${PACKAGE_VERSION}"
-)
+    )
+    list(APPEND TARGETS_TO_INSTALL lua_dynamic)
+    if(BUILD_SHARED_LIBS)
+        set(LUA_EXPORT_LIBRARY lua_dynamic)
+        add_library(Lua::Lib ALIAS lua_dynamic)
+    elseif(NOT TOP_LEVEL)
+        set_target_properties(lua_dynamic PROPERTIES
+            EXCLUDE_FROM_ALL ON
+        )
+    endif()
+endif()
+
+if(LUA_ENABLE_STATIC)
+    add_library(lua_static STATIC)
+    target_link_libraries(lua_static PUBLIC lua_obj)
+    set_target_properties(lua_static PROPERTIES
+        VERSION "${PACKAGE_VERSION}"
+    )
+    list(APPEND TARGETS_TO_INSTALL lua_static)
+    if(NOT BUILD_SHARED_LIBS)
+        set(LUA_EXPORT_LIBRARY lua_static)
+        add_library(Lua::Lib ALIAS lua_static)
+    elseif(NOT TOP_LEVEL)
+        set_target_properties(lua_static PROPERTIES
+            EXCLUDE_FROM_ALL ON
+        )
+    endif()
+endif()
+
 
 target_include_directories(lua_obj PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
@@ -76,20 +106,19 @@ if(UNIX)
 	)
 endif()
 
-if (WIN32 AND BUILD_SHARED_LIBS)
+if (WIN32)
     target_compile_definitions(lua_obj 
 		PRIVATE LUA_BUILD_AS_DLL
 	)
 endif()
 
-set(TARGETS_TO_INSTALL lua_lib)
-
 if(LUA_BUILD_BINARY)
     include(CheckIncludeFile)
     CHECK_INCLUDE_FILE("readline/readline.h" HAVE_READLINE_READLINE_H)
 
 
     add_executable(lua "src/lua.c")
+    # Can not use lua_dynamic because some symbols are not exported
     target_link_libraries(lua PRIVATE lua_obj)
     set_target_properties(lua PROPERTIES 
         RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}
@@ -127,6 +156,7 @@ write_basic_package_version_file(
 install(EXPORT LuaTargets
         FILE LuaTargets.cmake
         DESTINATION "lib/cmake"
+        NAMESPACE Lua::
 )
 
 configure_package_config_file(

lua-5.4.4/LuaConfig.cmake.in

@@ -3,8 +3,7 @@
 include("${CMAKE_CURRENT_LIST_DIR}/LuaTargets.cmake")
 
 set_and_check(LUA_INCLUDE_DIR "${PACKAGE_PREFIX_DIR}/include")
-set_and_check(LUA_LIBRARY "${PACKAGE_PREFIX_DIR}/lib/liblua.a")
-set(LUA_LIBRARIES "${LUA_LIBRARY}")
-add_library(Lua::Library ALIAS lua_static)
+add_library(Lua::Lib ALIAS "Lua::@LUA_EXPORT_LIBRARY@")
+set(LUA_LIBRARIES "Lua::Lib")
 
 check_required_components(Lua)