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CMakeLists.txt
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CMakeLists.txt
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cmake_minimum_required(VERSION 3.1)
project(sample_app)
##
# Warning user on doing compilation inside the source
if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
message(WARNING "*** Recommendation: Use separate build folder ***")
endif()
##-------------------- CMAKE_BUILD_TYPE -- START ------------------
# From commandline, one can set it via -DCMAKE_BUILD_TYPE=Release
# Set it if it is not set from commandline.
if(NOT CMAKE_BUILD_TYPE)
# NOTE: `CACHE STRING "Choose the type of build" FORCE` is to make sure that
# CMAKE_BUILD_TYPE has been set here.
set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build" FORCE)
# Set build types for cmake-gui otherwise cmake-gui will have empty line
set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release")
endif()
##-------------------- Validate build type ------------------
# Error if build type is not properly setup
if(NOT CMAKE_BUILD_TYPE MATCHES "release|Release|RELEASE|debug|Debug|DEBUG")
message("*** CMAKE_BUILD_TYPE is not set to known value:")
message("*** Possible values: Release;Debug")
message(FATAL_ERROR "*** CMAKE_BUILD_TYPE is not set properly")
endif()
##-------------------- Normalize build type ------------------
# Let's normalized user passed build type for ease of management
if((CMAKE_BUILD_TYPE MATCHES "DEBUG") OR (CMAKE_BUILD_TYPE MATCHES "debug"))
set(CMAKE_BUILD_TYPE "Debug")
endif()
if((CMAKE_BUILD_TYPE MATCHES "RELEASE") OR (CMAKE_BUILD_TYPE MATCHES "release"))
set(CMAKE_BUILD_TYPE "Release")
endif()
##-------------------- Customize build parameters ------------------
# Customize compiler flags as per build type
if(CMAKE_BUILD_TYPE MATCHES "Release")
add_definitions(-DBUILD_TYPE="Release")
endif()
if(CMAKE_BUILD_TYPE MATCHES "Debug")
add_definitions(-DBUILD_TYPE="Debug")
endif()
# Set default values of CXX flags for different builds.
# By default, cmake have following configuration
# - CMAKE_CXX_FLAGS:
# - CMAKE_CXX_FLAGS_DEBUG: -g
# - CMAKE_CXX_FLAGS_RELEASE: -O3 -DNDEBUG
set(CMAKE_CXX_FLAGS "-pipe" CACHE STRING "Default CXX flags" FORCE)
set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -ggdb" CACHE STRING "Default CXX flags for Debug build" FORCE)
set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG" CACHE STRING "Default CXX flags for Release build" FORCE)
##-------------------- CMAKE_BUILD_TYPE -- END ------------------
##------------------ CMake file generation -- START ---------------
# Set version
set(VERSION_MAJOR 1)
set(VERSION_MINOR 0)
set(VERSION_PATCH 0)
# Make version string
set(VERSION_STRING ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_MINOR})
# Configure a header file to have cmake version variables
configure_file(
"${PROJECT_SOURCE_DIR}/sample_config.h.in"
"${CMAKE_BINARY_DIR}/sample_config.h"
@ONLY
)
##------------------ CMake file generation -- END ---------------
##----------------- CXX related configuration -- START -------------
# Set CXX standard
set(CMAKE_CXX_STANDARD 14)
# Drop out if required standard is not supported
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# CXX extensions
set(CMAKE_CXX_EXTENSIONS OFF)
# Append extra flags
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -Wextra")
##----------------- CXX related configuration -- END -------------
##----------------- Dependency of a library -- START -------------
# Find package on the user defined path otherwise look onto default path
find_package(sample_lib PATHS $ENV{LIB_CMAKE_HOME} NO_DEFAULT_PATH)
find_package(sample_lib) # NOTE: If package is found on user-define path, it will be skipped
if(NOT sample_lib_FOUND)
message("*** Use env variable LIB_CMAKE_HOME to set custom path for cmake package")
message(FATAL_ERROR "*** sample_lib package is not found")
endif()
# Get sample_lib properties
get_target_property(sample_lib_LOCATION sample_lib IMPORTED_LOCATION_RELEASE)
# get_target_property(sample_lib_LANG sample_lib IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE)
get_target_property(sample_lib_INCLUDES sample_lib INTERFACE_INCLUDE_DIRECTORIES)
get_target_property(sample_lib_LINK_OPTIONS sample_lib INTERFACE_LINK_OPTIONS)
get_target_property(sample_lib_LIBS sample_lib INTERFACE_LINK_LIBRARIES)
get_target_property(sample_lib_LIBS_DIRS sample_lib INTERFACE_LINK_DIRECTORIES)
message("-----------------------------------------------------------")
message("sample_lib properties:")
message(" - Home: $ENV{LIB_CMAKE_HOME}")
message(" - LANG: ${sample_lib_LANG}")
message(" - Includes: ${sample_lib_INCLUDES}")
message(" - Libs name: ${sample_lib_LIBS}")
message(" - Link opts: ${sample_lib_LINK_OPTIONS}")
message(" - Libs dir: ${sample_lib_LIBS_DIRS}")
message(" - Libs path: ${sample_lib_LOCATION}")
message("-----------------------------------------------------------")
##----------------- Dependency of a library -- END -------------
##----------------- Setup target - START -------------
# Add source files to the program executable
add_executable(sample_app
${PROJECT_SOURCE_DIR}/sample.cc
${PROJECT_SOURCE_DIR}/util/util.cc
)
# Set include directories
target_include_directories(sample_app PRIVATE ${CMAKE_SOURCE_DIR}/util)
target_include_directories(sample_app PRIVATE ${CMAKE_BINARY_DIR})
# Install
install(TARGETS sample_app DESTINATION bin)
##----------------- Setup target - END -------------
##----------------- Dependency of a library -- END -------------
target_include_directories(sample_app PRIVATE ${sample_lib_INCLUDES})
target_link_libraries(sample_app sample_lib)
##----------------- Dependency of a library -- END -------------