Fix the issue where the output path of external settings does not tak…

…e effect! (#111)

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5)
 
 project(hwinfo VERSION 1.0.0 LANGUAGES CXX)
 
@@ -7,8 +7,12 @@ if (WIN32)
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 endif()
 
-set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
-set (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
+if(NOT HWINFO_CMAKE_BINARY_DIR)
+    set(HWINFO_CMAKE_BINARY_DIR ${CMAKE_BINARY_DIR})
+endif()
+
+set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${HWINFO_CMAKE_BINARY_DIR})
+set (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${HWINFO_CMAKE_BINARY_DIR})
 
 # if standard not provided, use the latest supported by the compiler
 if("${CMAKE_CXX_STANDARD}" STREQUAL "")
@@ -52,8 +56,8 @@ else(HWINFO_STATIC)
   set(HWINFO_BUILD STATIC)
 endif()
 
-set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${HWINFO_CMAKE_BINARY_DIR}/lib)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${HWINFO_CMAKE_BINARY_DIR}/lib)
 
 set(HWINFO_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/include")
 add_subdirectory(src)