Use lua from submodule if possible

Signed-off-by: Jarosław Pelczar <[email protected]>

CMakeLists.txt

@@ -86,17 +86,22 @@ find_package(PkgConfig)
 find_package(Lua)
 
 if(NOT LUA_FOUND)
- cpmaddpackage(
- NAME
- lua
- GIT_REPOSITORY
- https://github.com/lua/lua.git
- VERSION
- 5.4
- DOWNLOAD_ONLY
- YES)
-
- file(GLOB lua_sources ${lua_SOURCE_DIR}/onelua.c)
+ if(EXISTS external/lua/onelua.c)
+ set(lua_sources external/lua/onelua.c)
+ else()
+ cpmaddpackage(
+ NAME
+ lua
+ GIT_REPOSITORY
+ https://github.com/lua/lua.git
+ VERSION
+ 5.4
+ DOWNLOAD_ONLY
+ YES)
+
+ file(GLOB lua_sources ${lua_SOURCE_DIR}/onelua.c)
+ endif()
+
  add_library(lua_import STATIC ${lua_sources})
  target_include_directories(lua_import SYSTEM
  PUBLIC $<BUILD_INTERFACE:${lua_SOURCE_DIR}>)