# This is a CMakeLists flie that will let libmodbus 3.0.5 compile
# under Visual Studio 2008.  For other architectures, and Cygwin,
# just use the configure command in the source directory.
# Copy this file, along with stdin.g and config.h (rename them to
# remove the libmodbus_ part of the name) into the src/ directory
# in libmodbus, then use CMake to construct a build for the library.

cmake_minimum_required(VERSION 2.8.3)
project(LIBMODBUS)

#-----------------------------------------------------------------------------
# XXX Things to make better.
#
# Repeat for all other configurable headers/libraries - see below for a list
# Move the shared-library code over to CMake's normal definition
# Improve this CPack installer.

###
# Local CMake Modules - keep this first
###
list(APPEND CMAKE_MODULE_PATH ${LIBMODBUS_SOURCE_DIR}/cmake)

###
# On Windows 7, it does not work to install in the default location,
# which is the Program Files directory, because you have to not only have
# file permission to write there but also "run as administrator."  This
# means that "make install" from a Visual Studio project fails.  To get
# around that, we need to set CMAKE_INSTALL_PREFIX to something other
# than the default.  However, it is a cache variable that has already been
# set.  If we make a local variable, it uses this rather than the cache
# variable and never tells the poor user what happened (the GUI location
# looks standard but the files end up somewhere else).  If we make it a
# non-forced cache variable, it already has a value so does not change.
# If we make it a forced cache variable, it gets overwritten every time
# and the user cannot change it on the GUI.  So we have a workaround here.
# We make a cache variable that records whether we have ever forced the
# install prefix.  If not, we force it.  If so, we don't force it again.
# This has the effect of setting it the first time cmake is run, showing
# the change in the GUI, and also letting the user change the value in
# the GUI if they don't like what we did.  If I knew how to do this only
# happen on Windows 7, I'd make the if(WIN32) more specific.
if(WIN32 AND NOT SUBPROJECT)
	if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT
		AND
		(NOT
		ONCE_SET_CMAKE_INSTALL_PREFIX))
		set(ONCE_SET_CMAKE_INSTALL_PREFIX
			true
			CACHE
			INTERNAL
			"Have we set the install prefix yet?"
			FORCE)
		set(CMAKE_INSTALL_PREFIX
			C:/usr/local
			CACHE
			PATH
			"Install path prefix, prepended onto install directories"
			FORCE)
	endif()
endif()


#-----------------------------------------------------------------------------
# Compiler flags we got from Hans for Windows and from Sheldon Andrews
# for other architectures.
if(MSVC)	# MS-Windows Visual Studio, both 32 and 64 bits
    set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "add a postfix, usually d on windows")
	if(MSVC_VERSION GREATER 1310) # This compiler flag needs newer than VS.NET 2003 (7.1)
		# Choose fast, possibly less accurate floating point
		# See http://msdn.microsoft.com/en-us/library/e7s85ffb(v=vs.80).aspx
		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /fp:fast")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:fast")
	endif()

	# Do not assume fixed base address (probably for DLL integration?)
	# http://msdn.microsoft.com/en-us/library/w368ysh2(v=vs.80).aspx
	set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /FIXED:NO")
else()
	# GCC compilers on 64-bit machines require -fPIC for shared libraries or libs
	# linked into shared libraries.

	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_SHARED_LIBRARY_C_FLAGS}")
	set(CMAKE_CXX_FLAGS
		"${CMAKE_CXX_FLAGS} ${CMAKE_SHARED_LIBRARY_CXX_FLAGS}")
endif()

# Set up correct defines for Windows header compilation:
# This theoretically sets the lower-bound on operating system compatibility
# http://msdn.microsoft.com/en-us/library/windows/desktop/aa383745(v=vs.85).aspx
# NT4	0x0400
# Win2k	0x0500
# WinXP	0x0501
# WS2003SP1/WinXPSP2 	0x0502
# Vista 0x0600
# Win7  0x0601
# Win8  0x0601
if(WIN32)
	set(WIN_MIN_VER 0x0500) # Default to Windows 2000
	if(MSVC AND MSVC_VERSION GREATER 1699)
		# VS2012: defaults to vista+, update 1 added XP support in additional toolset.
		if("${CMAKE_VS_PLATFORM_TOOLSET}" MATCHES "_xp")
			set(WIN_MIN_VER 0x0501) # WinXP
		else()
			set(WIN_MIN_VER 0x0600) # Vista
		endif()
	endif()
	add_definitions("-D_WIN32_WINNT=${WIN_MIN_VER}" "-DNTDDI_VERSION=${WIN_MIN_VER}0000")
endif()

#-----------------------------------------------------------------------------
# Options that control what gets built and how.

# Force use of our CMake-processed configuration header before the stock one.
include_directories("${PROJECT_BINARY_DIR}")


# Include directory needed by all of the files
include_directories(${LIBMODBUS_SOURCE_DIR})


###
# Windows-specific (non-Cygwin) dependencies
###
if(WIN32 AND NOT UNIX)
	# Winsock - needed for TCP support
	list(APPEND EXTRA_LIBS ws2_32)
endif()

#-----------------------------------------------------------------------------
# Build the library itself and declare what bits need to be installed

set(LIBMODBUS_SOURCES
	modbus.c
	modbus-data.c
	modbus-rtu.c
	modbus-tcp.c
)

set(LIBMODBUS_PUBLIC_HEADERS
	modbus.h
	modbus-rtu.h
	modbus-tcp.h
	modbus-tcp-private.h
	modbus-version.h
)

add_library(libmodbus ${LIBMODBUS_SOURCES} ${LIBMODBUS_PUBLIC_HEADERS})
target_link_libraries(libmodbus ${EXTRA_LIBS})
set(LIBMODBUS_LIBRARY libmodbus)

set_property(TARGET
	libmodbus
	PROPERTY
	PUBLIC_HEADER
	${LIBMODBUS_PUBLIC_HEADERS})

set_property(TARGET
	libmodbus
	PROPERTY
	PROJECT_LABEL
	"LIBMODBUS Library")

set_property(TARGET
	libmodbus
	PROPERTY
	FOLDER
	"Library")

install(TARGETS
	libmodbus
	ARCHIVE
	DESTINATION
	lib
	PUBLIC_HEADER
	DESTINATION
	include
)