Cmake 将嵌套静态库安装target_link_library未定义的引用

问：

安装嵌套的静态库，target_link_library不起作用

文件结构：

HelloLib
    WorldLib
        CMakeLists.txt
        WorldLib.cpp
        WorldLib.h

    CMakeLists.txt
    HelloLib.cpp
    HelloLib.h

CMakeLists.txt
main.cpp

main.cpp

#include <iostream>
#include "HelloLib/HelloLib.h"
int main() {
  std::cout << hello() << std::endl;
  return 0;
}

CMakeLists.txt（根）

cmake_minimum_required(VERSION 3.16.3)
project(HelloWorld)

add_executable(${PROJECT_NAME} main.cpp)

add_subdirectory(HelloLib)
target_link_libraries(
    ${PROJECT_NAME}
    HelloLib
)

HelloLib.cpp

#include <string>
#include "WorldLib/WorldLib.h"
std::string hello() { return "Hello " + world(); }

你好库.h

#pragma once
#include <string>
std::string hello();

CMakeLists.txt （HelloLib）

add_library(HelloLib HelloLib.cpp)

add_subdirectory(WorldLib)
target_link_libraries(
    HelloLib
    WorldLib
)

WorldLib.cpp

#include <string>
std::string world() { return "World!"; }

WorldLib.h

#pragma once
#include <string>
std::string world();

CMakeLists.txt （WorldLib）

add_library(WorldLib WorldLib.cpp)

构建并运行，成功打印出来Hello World!

现在我想把 HelloLib 做成静态库

更改 CMakeLists.txt （HelloLib），安装到 和/usr/lib/usr/include

add_library(HelloLib HelloLib.cpp)

add_subdirectory(WorldLib)
target_link_libraries(
    HelloLib
    WorldLib
)

install(
    TARGETS HelloLib
    ARCHIVE DESTINATION lib
)
install(
    DIRECTORY "${CMAKE_SOURCE_DIR}/" # source directory
    DESTINATION "include" # target directory
    FILES_MATCHING # install only matched files
    PATTERN "*.h" # select header files
)

运行 （） （CMAKE_INSTALL_PREFIX=make install/usr)

mkdir -p out/build
cmake -S src -B out/build -DCMAKE_INSTALL_PREFIX=/usr
cd out/build
make
make install

[ 33%] Built target WorldLib
[ 66%] Built target HelloLib
[100%] Built target HelloWorld
Install the project...
-- Install configuration: ""
-- Installing: /usr/lib/libHelloLib.a
-- Up-to-date: /usr/include
-- Installing: /usr/include/HelloLib
-- Installing: /usr/include/HelloLib/HelloLib.h
-- Installing: /usr/include/HelloLib/WorldLib
-- Installing: /usr/include/HelloLib/WorldLib/WorldLib.h

静态库 （.a） 应生成/usr/lib/libHelloLib.a

让我们测试一下，更改CMakeLists.txt（根）

cmake_minimum_required(VERSION 3.16.3)
project(HelloWorld)

add_executable(${PROJECT_NAME} main.cpp)

add_subdirectory(HelloLib)
target_link_libraries(
    ${PROJECT_NAME}

    /usr/lib/libHelloLib.a
)

然后构建，它给出了未定义的引用错误

/bin/ld: /usr/lib/libHelloLib.a(HelloLib.cpp.o): in function `hello[abi:cxx11]()':
HelloLib.cpp:(.text+0x20): undefined reference to `world[abi:cxx11]()'

我怎么了？这可以在没有嵌套库的情况下成功

安装嵌套静态库的正确方法是什么？