cmake: detect vpp version, set soversion, pretty config print

Change-Id: I5d0777421debe6c3e4b93d62ad6790912063a9e6
Signed-off-by: Damjan Marion <damarion@cisco.com>

src/CMakeLists.txt

@@ -16,11 +16,22 @@ cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 project(vpp C)
 
 include(CheckCCompilerFlag)
-
 include(cmake/message.cmake)
 include(cmake/cpu.cmake)
 include(cmake/ccache.cmake)
 
+##############################################################################
+# VPP Version
+##############################################################################
+execute_process(
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMAND scripts/version
+  OUTPUT_VARIABLE VPP_VERSION
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+string(REPLACE "-" ";" VPP_LIB_VERSION ${VPP_VERSION})
+list(GET VPP_LIB_VERSION 0 VPP_LIB_VERSION)
+
 ##############################################################################
 # build config
 ##############################################################################
@@ -41,10 +52,6 @@ endif()
 set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${VPP_LIB_DIR_NAME}")
 set(CMAKE_INSTALL_MESSAGE NEVER)
 
-message(STATUS "CMAKE_C_FLAGS: ${CMAKE_C_FLAGS}")
-message(STATUS "We are on a ${CMAKE_SYSTEM_NAME} system")
-message(STATUS "The host processor is ${CMAKE_HOST_SYSTEM_PROCESSOR}")
-
 include_directories (
 	${CMAKE_SOURCE_DIR}
 	${CMAKE_BINARY_DIR}
@@ -74,3 +81,32 @@ foreach(
 endforeach()
 
 include(cmake/pack.cmake)
+##############################################################################
+# detect if we are inside git repo and add configure dependency
+##############################################################################
+execute_process(
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMAND git rev-parse --show-toplevel
+  OUTPUT_VARIABLE VPP_GIT_TOPLEVEL_DIR
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+if (VPP_GIT_TOPLEVEL_DIR)
+  set_property(
+    DIRECTORY APPEND PROPERTY
+    CMAKE_CONFIGURE_DEPENDS ${VPP_GIT_TOPLEVEL_DIR}/.git/index
+  )
+endif()
+
+##############################################################################
+# print configuration
+##############################################################################
+message(STATUS "Configuration:")
+pr("VPP version" "${VPP_VERSION}")
+pr("VPP library version" "${VPP_LIB_VERSION}")
+pr("GIT toplevel dir" "${VPP_GIT_TOPLEVEL_DIR}")
+pr("C flags" "${CMAKE_C_FLAGS}")
+pr("Linker flags" "${CMAKE_LINKER_FLAGS}")
+pr("Target processor" "${CMAKE_SYSTEM_PROCESSOR}")
+pr("Build type" "${CMAKE_BUILD_TYPE}")
+pr("Install prefix" "${CMAKE_INSTALL_PREFIX}")

src/cmake/library.cmake

@@ -21,6 +21,7 @@ macro(add_vpp_library lib)
 
   add_library(${lib} SHARED ${ARG_SOURCES})
   target_compile_options(${lib} PRIVATE -Wall)
+  set_target_properties(${lib} PROPERTIES SOVERSION ${VPP_LIB_VERSION})
 
   # library deps
   if(ARG_LINK_LIBRARIES)

src/cmake/message.cmake

@@ -34,3 +34,18 @@ function(message)
   endif()
 endfunction()
 
+##############################################################################
+# aligned config output
+##############################################################################
+function(pr desc val)
+  string(ASCII 27 esc)
+  set(reset "${esc}[m")
+  set(cyan "${esc}[36m")
+
+  string(LENGTH ${desc} len)
+  while (len LESS 20)
+    set (desc "${desc} ")
+    string(LENGTH ${desc} len)
+  endwhile()
+  _message("${cyan}${desc}${reset}: ${val}")
+endfunction()