fix cpp autolog

deploy/cpp_infer/CMakeLists.txt

 project(ppocr CXX C)
+cmake_minimum_required(VERSION 3.14)
 
 option(WITH_MKL        "Compile demo with MKL/OpenBlas support, default use MKL."       ON)
 option(WITH_GPU        "Compile demo with GPU/CPU, default use CPU."                    OFF)
@@ -206,13 +207,12 @@ endif()
 
 set(DEPS ${DEPS} ${OpenCV_LIBS})
 
-include(ExternalProject)
+include(FetchContent)
 include(external-cmake/auto-log.cmake)
-include_directories(${CMAKE_CURRENT_BINARY_DIR}/autolog/src/extern_Autolog/auto_log)
+include_directories(${FETCHCONTENT_BASE_DIR}/extern_autolog-src)
 
 AUX_SOURCE_DIRECTORY(./src SRCS)
 add_executable(${DEMO_NAME} ${SRCS})
-
 target_link_libraries(${DEMO_NAME} ${DEPS})
 
 if (WIN32 AND WITH_MKL)

deploy/cpp_infer/external-cmake/auto-log.cmake

 find_package(Git REQUIRED)
-message("${CMAKE_BUILD_TYPE}")
+include(FetchContent)
 
-set(AUTOLOG_REPOSITORY     https://github.com/LDOUBLEV/AutoLog.git)
-SET(AUTOLOG_INSTALL_DIR   ${CMAKE_CURRENT_BINARY_DIR}/install/Autolog)
+set(FETCHCONTENT_BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}/third-party")
 
-ExternalProject_Add(
-    extern_Autolog
-    PREFIX autolog
-    GIT_REPOSITORY ${AUTOLOG_REPOSITORY}
-    GIT_TAG main
-    DOWNLOAD_NO_EXTRACT True
-    INSTALL_COMMAND cmake -E echo "Skipping install step."
+FetchContent_Declare(
+  extern_Autolog
+  PREFIX autolog
+  GIT_REPOSITORY https://github.com/LDOUBLEV/AutoLog.git
+  GIT_TAG        main
 )
+FetchContent_MakeAvailable(extern_Autolog)
+

deploy/cpp_infer/src/main.cpp

@@ -35,6 +35,7 @@
 #include <sys/stat.h>
 
 #include <gflags/gflags.h>
+#include "auto_log/autolog.h"
 
 DEFINE_bool(use_gpu, false, "Infering with GPU or CPU.");
 DEFINE_int32(gpu_id, 0, "Device id of GPU to execute.");