使用 cmake 生成构建目标时未找到 CONAN_PKG::<PKG-NAME>

Question

CONAN_PKG::spdlog 使用 CMake 生成构建配置时未找到。

我使用的conan包是spdlog/1.3.1@bincrafters/stable。我有一个 CMake 可执行目标，它引用了一个 conan 包spdlog。我收到此错误消息：

[build] CMake Error at src/apps/ResultObserver/CMakeLists.txt:10 (ADD_EXECUTABLE):
[build]   Target "ResultObserver" links to target "CONAN_PKG::spdlog" but the target
[build]   was not found.  Perhaps a find_package() call is missing for an IMPORTED
[build]   target, or an ALIAS target is missing?

我的 CMakeLists.txt 中有这些行。

include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup()

ADD_EXECUTABLE(ResultObserver src/ResultObserver.cpp)

TARGET_LINK_LIBRARIES(ResultObserver CONAN_PKG::spdlog)

另外，安装conan包后，会在build目录下生成conanbuildinfo.cmake文件。

我检查了文件内部。它包含这些行。

    add_library(CONAN_PKG::spdlog INTERFACE IMPORTED)

    # Property INTERFACE_LINK_FLAGS do not work, necessary to add to INTERFACE_LINK_LIBRARIES
    set_property(TARGET CONAN_PKG::spdlog PROPERTY INTERFACE_LINK_LIBRARIES .........

有谁知道原因吗？

Answer 1

您正在寻找TARGETS方法。你需要传递TARGETS到conan_basic_setup()生成CONAN_PKG::。否则，${CONAN_LIBS}将仅可用。

include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup(TARGETS)

ADD_EXECUTABLE(ResultObserver src/ResultObserver.cpp)
TARGET_LINK_LIBRARIES(ResultObserver CONAN_PKG::spdlog)

关于 CMake 目标生成器的更多信息在这里：https : //docs.conan.io/en/latest/integrations/build_system/cmake/cmake_generator.html#targets-approach