build: use the system provided LuaJIT if found

e.g. buildroot has logic to build luajit,
so if pkg_check_modules can find a suitable version,
then use that one if -DFLB_PREFER_SYSTEM_LIB_LUAJIT=Yes.

Signed-off-by: Thomas Devoogdt <[email protected]>

Author: ThomasDevoogdt

CMakeLists.txt

@@ -178,6 +178,10 @@ option(FLB_HTTP_CLIENT_DEBUG  "Enable HTTP Client debug callbacks"   No)
 # Run ldconfig on package post-install
 option(FLB_RUN_LDCONFIG "Enable execution of ldconfig after installation" No)
 
+# Prefer system libraries if available
+option(FLB_PREFER_SYSTEM_LIBS             "Prefer system libraries"                   No)
+option(FLB_PREFER_SYSTEM_LIB_LUAJIT       "Prefer the libluajit system library"       ${FLB_PREFER_SYSTEM_LIBS})
+
 # Enable all features
 if(FLB_ALL)
   # Global
@@ -940,7 +944,16 @@ endif()
 # LuaJIT (Scripting Support)
 # ==========================
 if(FLB_LUAJIT)
-  include(cmake/luajit.cmake)
+  if(FLB_PREFER_SYSTEM_LIB_LUAJIT)
+    find_package(PkgConfig)
+    pkg_check_modules(LUAJIT luajit>=2.1.0)
+  endif()
+  if(LUAJIT_FOUND)
+    include_directories(${LUAJIT_INCLUDE_DIRS})
+    link_directories(${LUAJIT_LIBRARY_DIRS})
+  else()
+    include(cmake/luajit.cmake)
+  endif()
   FLB_DEFINITION(FLB_HAVE_LUAJIT)
 endif()
 

cmake/headers.cmake

@@ -22,10 +22,6 @@ include_directories(
   ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_CHUNKIO}/include
   ${CMAKE_CURRENT_BINARY_DIR}/lib/chunkio/include
 
-  # LuaJIT
-  ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_LUAJIT}/src
-  ${CMAKE_CURRENT_BINARY_DIR}/lib/luajit-cmake
-
   ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_MONKEY}/include
   ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_MONKEY}/include/monkey
   ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_MBEDTLS}/include

cmake/luajit.cmake

@@ -2,4 +2,9 @@
 option(LUAJIT_DIR "Path of LuaJIT 2.1 source dir" ON)
 option(LUAJIT_SETUP_INCLUDE_DIR "Setup include dir if parent is present" OFF)
 set(LUAJIT_DIR ${FLB_PATH_ROOT_SOURCE}/${FLB_PATH_LIB_LUAJIT})
+include_directories(
+  ${LUAJIT_DIR}/src
+  ${CMAKE_CURRENT_BINARY_DIR}/lib/luajit-cmake
+)
 add_subdirectory("lib/luajit-cmake")
+set(LUAJIT_LIBRARIES "libluajit")

src/CMakeLists.txt

@@ -223,7 +223,7 @@ endif()
 if(FLB_LUAJIT)
   set(extra_libs
     ${extra_libs}
-    "libluajit")
+    ${LUAJIT_LIBRARIES})
 endif()
 
 if(FLB_SQLDB)