使用Conan和CMake时无法找到所需的Boost库

Question

我有一个问题需要在Unix系统（Ubuntu）中使用boost库从conan依赖项中编译cmake方式的c++代码。SFML库已经实现并在项目中工作，但是boost库无法运行，并显示以下消息：

CMake Error at /usr/share/cmake-3.13/Modules/FindBoost.cmake:2100 (message):
  Unable to find the requested Boost libraries.

  Unable to find the Boost header files.  Please set BOOST_ROOT to the root
  directory containing Boost or BOOST_INCLUDEDIR to the directory containing
  Boost's headers.
Call Stack (most recent call first):
  CMakeLists.txt:13 (find_package)

这是我的conanfile.txt文件

[requires]
sfml/2.5.1@bincrafters/stable
boost/1.69.0@conan/stable

[options]
sfml:graphics=True
sfml:window=True
sfml:audio=True
sfml:network=False

[generators]
cmake

这是我的CMakeLists.txt文件。

# Minimum version of cmake
cmake_minimum_required(VERSION 3.10)

# Setting the project
project(CPP_rtype_2019 CXX)
include(build/conanbuildinfo.cmake)

# Dependencies Sfml
find_package(SFML 2.5.1 EXACT REQUIRED COMPONENTS system window graphics audio)
find_package(Threads REQUIRED)

# Dependencies Boost
find_package(Boost 1.69.0 EXACT REQUIRED COMPONENTS thread system filesystem)
include_directories(${Boost_INCLUDE_DIRS})

# Set the C++11 standard
set(CMAKE_CXX_STANDARD 11)

# Added all .hpp
include_directories(client/include)
include_directories(server/include)

# Added all .cpp
add_executable(r-type_client client/src/Actor.cpp client/src/Character.cpp client/src/Ennemy.cpp client/src/Interface.cpp client/src/Pown.cpp client/src/Projectile.cpp)
add_executable(r-type_server server/src/GameEngine.cpp)

# Added dependencies to compilation
target_link_libraries(r-type_client PRIVATE sfml-audio sfml-system sfml-graphics)
target_link_libraries(r-type_server PRIVATE Boost::thread Boost::system Boost::filesystem)

我尝试了很多解决方案，但都无效。欢迎提供任何解决方案或提示，谢谢！

- Hugo Sohm

---

你尝试过这个问题中提到的任何解决方案吗？ - Kevin

我认为正在使用的 find.cmake 脚本是系统自带的，这可能会有问题，因为它期望在系统级别找到 Boost，而不是作为 Conan 包。我强烈建议尝试使用 Conan 的方式（使用“conan_basic_setup(TARGETS)”并链接到目标“CONAN_PKG::boost”），或者尝试使用新的生成器“cmake_find_package_multi”，确保 CMAKE_MODULE_PATH 和 CMAKE_PREFIX_PATH 指向生成 find.cmake 脚本的目录。此外，将问题提交到 https://github.com/conan-io/conan 是更好的讨论方式。 - drodri

Answer 1

我认为您忘记在CMakeLists.txt中添加conan_basic_setup()。

请查看# 设置项目块。

# Minimum version of cmake
cmake_minimum_required(VERSION 3.10)

# Setting the project
project(CPP_rtype_2019 CXX)
include(build/conanbuildinfo.cmake)
conan_basic_setup()

# Dependencies Sfml
find_package(SFML 2.5.1 EXACT REQUIRED COMPONENTS system window graphics audio)
find_package(Threads REQUIRED)

# Dependencies Boost
find_package(Boost 1.69.0 EXACT REQUIRED COMPONENTS thread system filesystem)
include_directories(${Boost_INCLUDE_DIRS})

# Set the C++11 standard
set(CMAKE_CXX_STANDARD 11)

# Added all .hpp
include_directories(client/include)
include_directories(server/include)

# Added all .cpp
add_executable(r-type_client client/src/Actor.cpp client/src/Character.cpp client/src/Ennemy.cpp client/src/Interface.cpp client/src/Pown.cpp client/src/Projectile.cpp)
add_executable(r-type_server server/src/GameEngine.cpp)

# Added dependencies to compilation
target_link_libraries(r-type_client PRIVATE sfml-audio sfml-system sfml-graphics)
target_link_libraries(r-type_server PRIVATE Boost::thread Boost::system Boost::filesystem)

- Papaya

Answer 2

这是在自述文件中正确使用的示例 https://github.com/conan-io/cmake-conan

不需要 conanfile.txt，它会自动生成。

cmake_minimum_required(VERSION 3.5)
project(FormatOutput CXX)

list(APPEND CMAKE_MODULE_PATH ${CMAKE_BINARY_DIR})
list(APPEND CMAKE_PREFIX_PATH ${CMAKE_BINARY_DIR})

if(NOT EXISTS "${CMAKE_BINARY_DIR}/conan.cmake")
  message(STATUS "Downloading conan.cmake from https://github.com/conan-io/cmake-conan")
  file(DOWNLOAD "https://raw.githubusercontent.com/conan-io/cmake-conan/v0.16.1/conan.cmake"
                "${CMAKE_BINARY_DIR}/conan.cmake"
                EXPECTED_HASH SHA256=396e16d0f5eabdc6a14afddbcfff62a54a7ee75c6da23f32f7a31bc85db23484
                TLS_VERIFY ON)
endif()

include(${CMAKE_BINARY_DIR}/conan.cmake)

conan_cmake_configure(REQUIRES 
                      boost/1.69.0
                      GENERATORS cmake_find_package)

conan_cmake_autodetect(settings)

conan_cmake_install(PATH_OR_REFERENCE .
                    BUILD missing
                    REMOTE conancenter
                    SETTINGS ${settings})

find_package(Boost 1.69.0 EXACT REQUIRED COMPONENTS thread system filesystem)

add_executable(main main.cpp)
target_link_libraries(main 
     Boost::thread 
     Boost::system 
     Boost::filesystem)

- Sergei Krivonos