project(lua C)

set(LUA_VERSION_MAJOR 5)
set(LUA_VERSION_MINOR 1)
set(LUA_VERSION_PATCH 4)
set(LUA_VERSION "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

set(COMMON_CFLAGS)
set(COMMON_LDFLAGS)
set(LIBS)

if(APPLE)
	set(DEFAULT_POSIX TRUE)
	set(DEFAULT_DLOPEN OFF)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_USE_MACOSX")
elseif(UNIX OR CYGWIN)
	set(DEFAULT_POSIX TRUE)
elseif(WIN32)
	set(LUA_WIN TRUE)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_BUILD_AS_DLL")
else()
	set(DEFAULT_ANSI TRUE)
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	set(COMMON_LDFLAGS "${COMMON_LDFLAGS} -Wl,-E -lm")
	set(DEFAULT_DLOPEN ON)
endif()

option(LUA_USE_DLOPEN "Enable dlopen support." ${DEFAULT_DLOPEN})
mark_as_advanced(LUA_USE_DLOPEN)

option(LUA_ANSI "Disable non-ANSI features." ${DEFAULT_ANSI})
mark_as_advanced(LUA_ANSI)

if(LUA_USE_DLOPEN)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_USE_DLOPEN")
	if(NOT APPLE)
		set(COMMON_LDFLAGS "${COMMON_LDFLAGS} -ldl ")
	endif(NOT APPLE)
endif(LUA_USE_DLOPEN)

if(DEFAULT_POSIX)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_USE_POSIX")
endif(DEFAULT_POSIX)

if(LUA_ANSI)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_ANSI")
endif(LUA_ANSI)

# COMMON_CFLAGS has no effect without this line
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COMMON_CFLAGS}")


# Standard flags to use for each build type.
if(CMAKE_COMPILER_IS_GNUCC)
	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe -Wall -Wextra -Wshadow -W -pedantic -std=gnu99")
	set(CMAKE_C_FLAGS_RELEASE        "${CMAKE_C_FLAGS_RELEASE}     -O2")
	set(CMAKE_C_FLAGS_DEBUG          "${CMAKE_C_FLAGS_DEBUG}       -O0 -g")
	set(CMAKE_C_FLAGS_PROFILE        "${CMAKE_C_FLAGS_PROFILE}     -O1 -g")
	set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_WITHDEBINFO} -O2 -g")
endif(CMAKE_COMPILER_IS_GNUCC)

# check compatible compileer must be after project definition and set flags, assume if C++ is installed also CC is installed
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
	if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++0x")
	else()
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
	endif()
	if (CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
		set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
	elseif (CMAKE_C_COMPILER_VERSION VERSION_EQUAL 4.6)
		set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu1x")
	else()
		set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
	endif()
	message(STATUS "using gnu compiler")
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
	if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++1y")
	else()
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
	endif()
	if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.5)
		set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
	endif()
	message(STATUS "using clang compiler")
else()
	if (CMAKE_VERSION VERSION_GREATER 3.0)
		set(CMAKE_C_STANDARD 11)
		set(CMAKE_CXX_STANDARD 11)
	else()
		if(APPLE)
		# Fix behavior of CMAKE_CXX_STANDARD when targeting macOS.
			if (POLICY CMP0025)
				cmake_policy(SET CMP0025 NEW)
			endif ()
		endif ()
	endif()
	message(STATUS "using default installed compiler")
endif()

add_subdirectory(src build)