CMake:尝试将链接库添加到未在此目录中构建的目标

Question

我在cmake项目中编译一些单元测试时遇到了问题.我们的想法是将这些boost单元测试添加为可执行文件,以便我可以运行它们.无论如何我得到这个错误,我没有放弃理解,这是说我无法链接我的cpp单元测试必须链接到测试我建立的库.我试图链接并添加为可执行文件的两个单元测试是DownloadTickers.cpp和GetTickersForLetter.cpp.

我的目录结构如下:

> Algo
  > build (this is where I do: cmake .. which gives me errors)
  -CMakeLists.txt (top level cmake)
  -algo.h.ini
  -run.cpp
  > NetworkModule
   > CrawlTickers
    -CMakeLists.txt
    -CrawlTickers.cpp
    -CrawlTickers.hpp
    > tests
     -CMakeLists.txt
     -DownloadTickers.cpp
     -GetTickersForLetter.cpp

Algo的CMakeLists.txt是:

cmake_minimum_required (VERSION 2.8)
project (Algo)

set (Algo_VERSION_MAJOR 0)
set (Algo_VERSION_MINOR 1)
set (CMAKE_CXX_COMPILER g++-4.8)
set (CMAKE_BUILD_TYPE Release)

add_definitions(
  -std=c++11
)

configure_file(
  "${PROJECT_SOURCE_DIR}/algo.h.in"
  "${PROJECT_BINARY_DIR}/algo.h"
)

include_directories("${PROJECT_BINARY_DIR}")

add_subdirectory(NetworkModule/CrawlTickers)

add_executable(Run run.cpp)

CrawlTickers的CMakeLists.txt是:

find_package(Boost COMPONENTS system filesystem unit_test_framework REQUIRED)

add_library(CrawlTickers SHARED CrawlTickers.cpp)

add_subdirectory(tests)

target_link_libraries(
  CrawlTickers
  cpprest
)

target_link_libraries(
  DownloadTickers
  CrawlTickers
  ${Boost_FILESYSTEM_LIBRARY}
  ${Boost_SYSTEM_LIBRARY}
  ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY}
)

target_link_libraries(
  GetTickersForLetter
  CrawlTickers
  ${Boost_FILESYSTEM_LIBRARY}
  ${Boost_SYSTEM_LIBRARY}
  ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY}
)

用于测试的CMakeLists.txt是:

add_executable( DownloadTickers DownloadTickers.cpp )

add_executable( GetTickersForLetter GetTickersForLetter.cpp )

我的想法是,cmake会自然地将DownloadTickers和GetTickersForLetter注册为CrawlTickers CMakeLists.txt中的可执行文件,然后知道如何将其链接到目标,但我不知道为什么我会收到此错误.任何帮助是极大的赞赏.谢谢.

Answer 1

该target_link_libraries指令必须是相同的一部分,CMakeLists.txt作为add_executable指令.这也适用于图书馆.考虑每个目录并将其关联CMakeLists.txt为子项目.