Add dsplib::interface target

Author: vitalsong

CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required(VERSION 3.10)
-project(dsplib LANGUAGES CXX VERSION 0.54.9)
+cmake_minimum_required(VERSION 3.15...4.0)
+project(dsplib LANGUAGES CXX VERSION 0.55.0)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -63,14 +63,20 @@ add_library(${PROJECT_NAME} ${DSPLIB_SOURCES})
 target_compile_definitions(${PROJECT_NAME} PRIVATE 
     "DSPLIB_FFT_CACHE_SIZE=${DSPLIB_FFT_CACHE_SIZE}")
 
-target_include_directories(${PROJECT_NAME} 
-    PUBLIC 
+# add INTERFACE target
+add_library(${PROJECT_NAME}-interface INTERFACE)
+add_library(${PROJECT_NAME}::interface ALIAS ${PROJECT_NAME}-interface)
+
+target_include_directories(${PROJECT_NAME}-interface 
+    INTERFACE 
         "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
         "$<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>"
         "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
-    PRIVATE lib
 )
 
+target_link_libraries(${PROJECT_NAME} INTERFACE ${PROJECT_NAME}-interface)
+target_include_directories(${PROJECT_NAME} PRIVATE lib)
+
 # check root project
 if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_LIST_DIR}")
     set(DSPLIB_IS_ROOT ON)

examples/fftw-backend/CMakeLists.txt

@@ -5,8 +5,11 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_library(dsplib-fftw fft.cpp)
-target_link_libraries(dsplib-fftw PUBLIC dsplib FFTW:Double)
+target_link_libraries(dsplib-fftw PUBLIC dsplib::interface FFTW:Double)
+
+cmake_policy(SET CMP0079 NEW)
+target_link_libraries(dsplib PRIVATE dsplib-fftw)
 
 add_executable(${PROJECT_NAME} main.cpp)
 target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_LIST_DIR})
-target_link_libraries(${PROJECT_NAME} PUBLIC dsplib dsplib-fftw)
+target_link_libraries(${PROJECT_NAME} PUBLIC dsplib)