[runtime] support windows (#71)

Author: pengzhendong

runtime/CMakeLists.txt

@@ -8,12 +8,20 @@ option(BUILD_TESTING "whether to build unit test" OFF)
 
 include(FetchContent)
 set(FETCHCONTENT_QUIET OFF)
-get_filename_component(fc_base "fc_base" REALPATH BASE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+get_filename_component(fc_base "fc_base-${CMAKE_CXX_COMPILER_ID}" REALPATH BASE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 set(FETCHCONTENT_BASE_DIR ${fc_base})
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
-# Keep the same with openfst, -fPIC or -fpic
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -pthread -fPIC")
+if(NOT MSVC)
+  # Keep the same with openfst, -fPIC or -fpic
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -pthread -fPIC")
+else()
+  # For windows, please use unicode(3 bytes per chinese char) instead of gbk(2 bytes per chinese char).
+  # https://github.com/wenet-e2e/wenet/issues/882#issuecomment-1101246299
+  set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+  add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
+endif()
+
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
   set(CMAKE_MACOSX_RPATH 1)
 endif()