target_link_libraries和INCLUDE_DIRECTORIES属性 [英] target_link_libraries and INCLUDE_DIRECTORIES property

问题描述

此代码段中

cmake_minimum_required(VERSION 3.0)
project(hello LANGUAGES C VERSION 0.0.1)
add_library(a INTERFACE)
target_include_directories(a INTERFACE /usr/local/include)
add_executable(b main.c)
target_link_libraries(b PUBLIC a)
get_target_property(dirs b INCLUDE_DIRECTORIES)
message(STATUS "dirs: ${dirs}")

CMake将打印：

-- dirs: dirs-NOTFOUND

我要全部包含目标的目录，但显然是通过 target_link_libraries 添加的目录不知何故。如何获取目标的所有包含目录？

I want all include directories of a target, but apparently those added via target_link_libraries get ignored somehow. How can I obtain all include directories of a target?

推荐答案

问题是，您要查找的信息仅在生成步骤。您只能通过例如 add_custom_target（） 调用，它们在编译时运行。您的 get_target_property（）和 message（）调用在CMake配置步骤中运行。

The problem is that the information you are seeking is only available after the generation step. You can get those only with e.g. add_custom_target() calls, which run during compile time. Your get_target_property() and message() calls run during CMake configuration step.

免责声明：取自以下链接的问题的一些小修改：

Disclaimer: Taken with small modifications from the question linked below:

add_custom_command(
    b_lists ALL
    ${CMAKE_COMMAND} -E echo "b INCLUDE_DIRECTORIES: $<TARGET_PROPERTY:B,INCLUDE_DIRECTORIES>"
)

参考

• CMake中LINK_LIBRARIES的递归列表


• <
$ b是href = https://stackoverflow.com/questions/37900332/target-include-directories-prior-to-2-8-12> target_include_directories在2.8.12之前？

• Recursive list of LINK_LIBRARIES in CMake
• target_include_directories prior to 2.8.12?

这篇关于target_link_libraries和INCLUDE_DIRECTORIES属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！