如何使用cmake（cpprest-sdk）创建特定目标

Question

基于这个问题CMake cpprestsdk我尝试从cpprestsdk源代码创建一个特定的目标。首先，我将github项目克隆到

/home/user/git/cpprestsdk

然后，我创建了 CmakeLists.txt 文件

project(ProjectName)
find_package(cpprestsdk CONFIG REQUIRED) 
target_link_libraries(ProjectName PRIVATE cpprestsdk::cpprestsdk_boost_internal)

和 cmake 命令：

cmake -DCMAKE_PREFIX_PATH=/home/user/git/cpprestsdk/Release/src .

并出现以下错误：

CMake Error at cpprestsdk/Release/src/cpprestsdk-config.cmake:25 (include):
  include could not find load file:

    /home/ebalbar/git/cpprestsdk/Release/src/cpprestsdk-targets.cmake
Call Stack (most recent call first):
  CMakeLists.txt:2 (find_package)


CMake Error at CMakeLists.txt:3 (target_link_libraries):
  Cannot specify link libraries for target "ProjectName" which is not built
  by this project.

目标文件可以在

/home/user/git/cpprestsdk/Release/src/CMakeFiles/Export/lib/cmake/cpprestsdk/cpprestsdk-targets.cmake

下找到

所以问题是如何建立

cpprestsdk::cpprestsdk_boost_internal

目标？

提前致谢！

Answer 1

正如 @Tsyvarev 指出的，首先应该构建和安装库。

cmake .
cmake --build .
cmake --install . --prefix <install_folder>

然后，应用程序 CMakeList.txt 应如下所示：

cmake_minimum_required(VERSION 3.16)
# In your project's CMakeLists.txt
project(ProjectName)
set(CMAKE_PREFIX_PATH "<install_folder>")

find_package(cpprestsdk REQUIRED)
add_library(my_target SHARED main.cpp)
# Link to `cpprestsdk::cpprestsdk_openssl_internal` in your target
target_link_libraries(my_target cpprestsdk::cpprestsdk_openssl_internal)

然后我可以使用以下 cmake 命令构建应用程序：

cmake .
cmake --build .