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unset(VERSION)
# Ignore all default paths for this test to avoid finding system Lua
set(CMAKE_INCLUDE_PATH )
set(CMAKE_PREFIX_PATH )
set(CMAKE_FRAMEWORK_PATH )
set(ENV{CMAKE_INCLUDE_PATH} )
set(ENV{CMAKE_PREFIX_PATH} )
set(ENV{CMAKE_FRAMEWORK_PATH} )
set(ENV{PATH} )
set(ENV{INCLUDE} )
set(CMAKE_SYSTEM_INCLUDE_PATH )
set(CMAKE_SYSTEM_PREFIX_PATH )
set(CMAKE_SYSTEM_FRAMEWORK_PATH )
function(require_found path version)
find_package(Lua ${VERSION} QUIET)
if(NOT "${LUA_INCLUDE_DIR}" STREQUAL "${path}")
message(FATAL_ERROR "LUA_INCLUDE_PATH != path: '${LUA_INCLUDE_DIR}' != '${path}'")
endif()
if(NOT LUA_VERSION_STRING MATCHES "^${version}\.[0-9]$")
message(FATAL_ERROR "Wrong versionfound in '${LUA_INCLUDE_DIR}': ${LUA_VERSION_STRING} != ${version}")
endif()
endfunction()
# Use functions for scoping and better error messages
function(require_find path version)
unset(LUA_INCLUDE_DIR CACHE)
require_found(${lua_path} ${version})
endfunction()
function(test_prefix_path path lua_path version)
set(CMAKE_PREFIX_PATH ${path})
require_find(lua_path ${version})
endfunction()
function(test_include_path path lua_path version)
set(CMAKE_INCLUDE_PATH ${path})
require_find(lua_path ${version})
endfunction()
function(test_env_path path lua_path version)
set(ENV{LUA_DIR} ${path})
require_find(lua_path ${version})
unset(ENV{LUA_DIR})
endfunction()
function(test_path prefix_path lua_path version)
# Shortcut: Make paths relative to current list dir
set(prefix_path ${CMAKE_CURRENT_LIST_DIR}/${prefix_path})
set(lua_path ${CMAKE_CURRENT_LIST_DIR}/${lua_path})
test_prefix_path(${prefix_path} ${lua_path} ${version})
test_include_path(${prefix_path}/include ${lua_path} ${version})
test_env_path(${prefix_path} ${lua_path} ${version})
endfunction()
# Simple test
test_path(prefix1 prefix1/include 5.3)
# Find highest version
test_path(prefix2 prefix2/include/lua5.3 5.3)
foreach(ver 5.3 5.2 5.1)
# At least X or X.0 -> Highest
set(VERSION "${ver}")
test_path(prefix2 prefix2/include/lua5.3 5.3)
set(VERSION "${ver}.0")
test_path(prefix2 prefix2/include/lua5.3 5.3)
# Exactly X/X.0
set(VERSION "${ver}" EXACT)
test_path(prefix2 prefix2/include/lua${ver} ${ver})
set(VERSION "${ver}.0" EXACT)
test_path(prefix2 prefix2/include/lua${ver} ${ver})
endforeach()
# Find unknown version
set(VERSION "5.9")
test_path(prefix2 prefix2/include/lua5.9 5.9)
set(VERSION "5.9" EXACT)
test_path(prefix2 prefix2/include/lua5.9 5.9)
# Set LUA_INCLUDE_DIR (non-cache) to unsuitable version
set(LUA_INCLUDE_DIR ${CMAKE_CURRENT_LIST_DIR}/prefix2/include/lua5.2)
set(VERSION "5.1" EXACT)
test_path(prefix2 prefix2/include/lua5.1 5.1)
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