g3log/Build.cmake

# g3log is a KjellKod Logger
# 2015 @author Kjell Hedström, hedstrom@kjellkod.cc
# ==================================================================
# 2015 by KjellKod.cc. This is PUBLIC DOMAIN to use at your own
#    risk and comes  with no warranties.
#
# This code is yours to share, use and modify with no strings attached
#   and no restrictions or obligations.
# ===================================================================

 # GENERIC STEPS
 SET(LOG_SRC ${g3log_SOURCE_DIR}/src)

 file(GLOB SRC_FILES  ${LOG_SRC}/*.cpp ${LOG_SRC}/*.ipp)
 file(GLOB HEADER_FILES ${LOG_SRC}/g3log/*.hpp)
 
 list( APPEND HEADER_FILES ${GENERATED_G3_DEFINITIONS} )
 list( APPEND SRC_FILES ${GENERATED_G3_DEFINITIONS} )

 IF (MSVC OR MINGW)
    list(REMOVE_ITEM SRC_FILES  ${LOG_SRC}/crashhandler_unix.cpp)
 ELSE()
    list(REMOVE_ITEM SRC_FILES  ${LOG_SRC}/crashhandler_windows.cpp ${LOG_SRC}/g3log/stacktrace_windows.hpp ${LOG_SRC}/stacktrace_windows.cpp)
 ENDIF (MSVC OR MINGW)

 set(SRC_FILES ${SRC_FILES} ${SRC_PLATFORM_SPECIFIC})

 # Create the g3log library
 SET(G3LOG_LIBRARY g3logger)

 IF( G3_SHARED_LIB )
    IF( WIN32 )
       IF(NOT(${CMAKE_VERSION} VERSION_LESS "3.4"))
          set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
       ELSE()
          message( FATAL_ERROR "Need CMake version >=3.4 to build shared windows library!" )
       ENDIF()
    ENDIF()
    ADD_LIBRARY(${G3LOG_LIBRARY} SHARED ${SRC_FILES})
 ELSE()
    IF(MSVC)
    	IF(NOT G3_SHARED_RUNTIME)
            SET(CompilerFlags
                  CMAKE_CXX_FLAGS
                  CMAKE_CXX_FLAGS_DEBUG
                  CMAKE_CXX_FLAGS_RELEASE
                  CMAKE_C_FLAGS
                  CMAKE_C_FLAGS_DEBUG
                  CMAKE_C_FLAGS_RELEASE
               )
            foreach(CompilerFlag ${CompilerFlags})
               string(REPLACE "/MDd" "/MTd" ${CompilerFlag} "${${CompilerFlag}}")
               string(REPLACE "/MD" "/MT" ${CompilerFlag} "${${CompilerFlag}}")
            endforeach()
         ENDIF()
    ENDIF()
    ADD_LIBRARY(${G3LOG_LIBRARY} STATIC ${SRC_FILES})
 ENDIF()

 SET(${G3LOG_LIBRARY}_VERSION_STRING ${VERSION})
 MESSAGE( STATUS "Creating ${G3LOG_LIBRARY} VERSION: ${VERSION}" )

 SET_TARGET_PROPERTIES(${G3LOG_LIBRARY} PROPERTIES
    LINKER_LANGUAGE CXX
    OUTPUT_NAME g3logger
    CLEAN_DIRECT_OUTPUT 1
    CXX_STANDARD 14
    CXX_STANDARD_REQUIRED YES
    CXX_EXTENSIONS NO
    SOVERSION ${VERSION}
    )

 IF(APPLE)
   SET_TARGET_PROPERTIES(${G3LOG_LIBRARY} PROPERTIES MACOSX_RPATH TRUE)
 ENDIF()

# require here some proxy for c++14 standard to avoid problems TARGET_PROPERTY CXX_STANDARD
TARGET_COMPILE_FEATURES(${G3LOG_LIBRARY} PUBLIC cxx_variable_templates)

 
TARGET_INCLUDE_DIRECTORIES(${G3LOG_LIBRARY} PUBLIC ${LOG_SRC} "${CMAKE_CURRENT_BINARY_DIR}/include")
SET(ACTIVE_CPP0xx_DIR "Release")

# find corresponding thread lib (e.g. whether -lpthread is needed or not)
FIND_PACKAGE(Threads REQUIRED)
TARGET_LINK_LIBRARIES(${G3LOG_LIBRARY} Threads::Threads )

# check for backtrace and cxa_demangle only in non-Windows dev environments
IF(NOT(MSVC OR MINGW))
	# the backtrace module does not provide a modern cmake target
	FIND_PACKAGE(Backtrace REQUIRED)
	if(Backtrace_FOUND)
	  TARGET_INCLUDE_DIRECTORIES(${G3LOG_LIBRARY} PRIVATE ${Backtrace_INCLUDE_DIRS})
	  TARGET_LINK_LIBRARIES(${G3LOG_LIBRARY} ${Backtrace_LIBRARIES})
	 else() 
	  message( FATAL_ERROR "Could not find Library to create backtraces")
	endif()


	INCLUDE(CheckLibraryExists)
	INCLUDE(CheckCXXSymbolExists)

	#if demangle is in c++ runtime lib
	CHECK_CXX_SYMBOL_EXISTS(abi::__cxa_demangle "cxxabi.h" DEMANGLE_EXISTS)
	IF( NOT (DEMANGLE_EXISTS))
	   #try to link against c++abi to get demangle
	   CHECK_LIBRARY_EXISTS(c++abi abi::__cxa_demangle "cxxabi.h" NEED_C++ABI)
	   IF( NEED_C++ABI)
	      TARGET_LINK_LIBRARIES(${G3LOG_LIBRARY} c++abi)
	   ELSE()
	   message( FATAL_ERROR "Could not find function abi::__cxa_demangle")
	   ENDIF()
	endif()
ENDIF()
# add Warnings
target_compile_options(${G3LOG_LIBRARY} PRIVATE
   # clang/GCC warnings
   $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:GNU>>:-Wall -Wunused>
   # MSVC warnings
   $<$<CXX_COMPILER_ID:MSVC>:/W4>)
# add GCC specific stuff
target_compile_options(${G3LOG_LIBRARY} PRIVATE
   # clang/GCC warnings
   $<$<CXX_COMPILER_ID:GNU>:-rdynamic>
)

#cmake -DCMAKE_CXX_COMPILER=clang++ ..
  # WARNING: If Clang for Linux does not work with full c++14 support it might be your
  # installation that is faulty. When I tested Clang on Ubuntu I followed the following
  # description
  #  1) http://kjellkod.wordpress.com/2013/09/23/experimental-g3log-with-clang/
  #  2) https://github.com/maidsafe/MaidSafe/wiki/Hacking-with-Clang-llvm-abi-and-llvm-libc

# Windows Stuff
IF(MSVC OR MINGW)
   TARGET_COMPILE_DEFINITIONS(${G3LOG_LIBRARY} PRIVATE NOGDI)
   TARGET_LINK_LIBRARIES(${G3LOG_LIBRARY} dbghelp)
   # VC11 bug: http://code.google.com/p/googletest/issues/detail?id=408
   #          add_definition(-D_VARIADIC_MAX=10)
   # https://github.com/anhstudios/swganh/pull/186/files
   TARGET_COMPILE_DEFINITIONS(${G3LOG_LIBRARY} PRIVATE _VARIADIC_MAX=10)
   MESSAGE(STATUS "- MSVC: Set variadic max to 10 for MSVC compatibility")
   # Remember to set set target properties if using GTEST similar to done below on target "unit_test"
   # "set_target_properties(unit_test  PROPERTIES COMPILE_DEFINITIONS "GTEST_USE_OWN_TR1_TUPLE=0")
   message( STATUS "" )
   message( STATUS "Windows: Run cmake with the appropriate Visual Studio generator" )
   message( STATUS "The generator is one number below the official version number. I.e. VS2013 -> Generator 'Visual Studio 12'" )
   MESSAGE( STATUS "I.e. if VS2013: Please run the command [cmake -DCMAKE_BUILD_TYPE=Release -G \"Visual Studio 12\" ..]")
   message( STATUS "if cmake finishes OK, do 'msbuild g3log.sln /p:Configuration=Release'" )
   message( STATUS "then run 'Release\\g3log-FATAL-*' examples" )
   message( STATUS "" )
ENDIF()

TARGET_COMPILE_OPTIONS(${G3LOG_LIBRARY} PRIVATE 
   $<$<CXX_COMPILER_ID:MSVC>:/utf-8> # source code already in utf-8, force it for compilers in non-utf8_windows_locale
   $<$<CXX_COMPILER_ID:MSVC>:$<$<EQUAL:4,${CMAKE_SIZEOF_VOID_P}>:/arch:IA32>>
)