Directly link with targets from CMake

Consider the ful package delivers the two libraries wiringPi and
wiringPiDev with the associated binary gpio. We don't have to build and
install each component separately first.

devLib/CMakeLists.txt

@@ -27,6 +27,9 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wformat=2 -Winline -pipe")
 # Add the library target
 add_library(wiringPiDev SHARED ${SRC})
 
+target_include_directories(wiringPiDev PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(wiringPiDev PRIVATE wiringPi)
+
 # Set the library version
 set_target_properties(wiringPiDev PROPERTIES VERSION ${WIRINGPI_VERSION} SOVERSION ${WIRINGPI_SOVERSION})
 

gpio/CMakeLists.txt

@@ -20,12 +20,8 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra")
 # Add the executable target
 add_executable(gpio ${SRC})
 
-# Find the required libraries
-find_library(WIRINGPI_LIB wiringPi)
-find_library(WIRINGPI_DEV_LIB wiringPiDev)
-
 # Link the required libraries
-target_link_libraries(gpio ${WIRINGPI_LIB} ${WIRINGPI_DEV_LIB} Threads::Threads m PkgConfig::libcrypt)
+target_link_libraries(gpio wiringPi wiringPiDev Threads::Threads m PkgConfig::libcrypt)
 
 # Install the executable
 install(TARGETS gpio DESTINATION bin)