Globally set shared library versions from root CMakeLists.txt

By the way, set SOVERSION to version major. It also fixes wiringPiDev
shared library version not correctly set.

CMakeLists.txt

@@ -1,6 +1,11 @@
 cmake_minimum_required(VERSION 3.10)
 project(WiringPiLib)
 
+# Read version from version.h
+file(READ "${CMAKE_CURRENT_SOURCE_DIR}/version.h" WIRINGPI_VERSION)
+string(REGEX REPLACE ".*VERSION \"([0-9]+.[0-9]+)\".*" "\\1" WIRINGPI_VERSION "${WIRINGPI_VERSION}")
+string(REGEX REPLACE "([0-9]+)\..*" "\\1" WIRINGPI_SOVERSION "${WIRINGPI_VERSION}")
+
 # Include subdirectories
 add_subdirectory(devLib)
 add_subdirectory(gpio)

devLib/CMakeLists.txt

@@ -28,7 +28,7 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wformat=2 -Winline -pipe")
 add_library(wiringPiDev SHARED ${SRC})
 
 # Set the library version
-set_target_properties(wiringPiDev PROPERTIES VERSION ${VERSION} SOVERSION ${WIRINGPI_SONAME_SUFFIX})
+set_target_properties(wiringPiDev PROPERTIES VERSION ${WIRINGPI_VERSION} SOVERSION ${WIRINGPI_SOVERSION})
 
 # Install headers
 install(FILES ${HEADERS} DESTINATION include)

wiringPi/CMakeLists.txt

@@ -44,18 +44,12 @@ set(HEADERS
 )
 # Compiler flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wformat=2 -Winline -pipe -Wformat-security")
-set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-soname,libwiringPi.so${WIRINGPI_SONAME_SUFFIX}")
-
-# Read version from version.h
-file(READ "${CMAKE_CURRENT_SOURCE_DIR}/../version.h" VERSION)
-string(REGEX REPLACE ".*VERSION \"([0-9]+.[0-9]+)\".*" "\\1" VERSION "${VERSION}")
 
 # Add the library target
 add_library(wiringPi SHARED ${SRC})
 
 # Set the library version
-set(WIRINGPI_SONAME_SUFFIX "1")
-set_target_properties(wiringPi PROPERTIES VERSION ${VERSION} SOVERSION ${WIRINGPI_SONAME_SUFFIX})
+set_target_properties(wiringPi PROPERTIES VERSION ${WIRINGPI_VERSION} SOVERSION ${WIRINGPI_SOVERSION})
 target_include_directories(wiringPi PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
 # Add -lm to link with the math library