OBJECT库上的传递性target_include_directories [英] Transitive target_include_directories on OBJECT libraries

问题描述

以下是make CMakeLists.txt中的代码段：

Here is snippet from make CMakeLists.txt:

add_library(foo-object OBJECT src/foo.cpp)
target_include_directories(foo-object PUBLIC include)
add_library(foo SHARED $<TARGET_OBJECTS:${PROJECT_NAME}-object>)
add_library(foo_static STATIC $<TARGET_OBJECTS:${PROJECT_NAME}-object>)

现在，这一切正常，两个库都生成了。但是，当我尝试使用它时遇到问题：

Now, this all works fine, both libraries are generated. However I have a problem when I try to use it:

add_executable(bar src/main.cpp)
target_link_libraries(bar foo)

目标 bar 不t编译，因为不传播foo-object的include目录。如果我也直接在 foo 上添加 target_include_directories ，一切都可以编译。

Target bar doesn't compile, because include directories from foo-object are not propagated. If I add target_include_directories directly on foo as well, everything will compile fine.

如何使 foo 和 foo_static 都自动使用（并根据它们转发内容）包括 foo-object ？

How can I make both foo and foo_static automatically use (and forward to stuff depending on them) include directories from foo-object?

推荐答案

Hm中的目录，我想到以下内容：

Hm, at the moment I came up with following:

add_library(foo-object OBJECT src/foo.cpp)
target_include_directories(foo-object PUBLIC include)

get_property(object_include_dirs TARGET foo-object PROPERTY INCLUDE_DIRECTORIES)
get_property(object_link_libs TARGET foo-object PROPERTY LINK_LIBRARIES)

add_library(foo SHARED $<TARGET_OBJECTS:${PROJECT_NAME}-object>)
target_include_directories(foo PUBLIC ${object_include_dirs})
target_link_libraries(foo PUBLIC ${object_link_libs})

add_library(foo_static STATIC $<TARGET_OBJECTS:${PROJECT_NAME}-object>)
target_include_directories(foo_static PUBLIC ${object_include_dirs})
target_link_libraries(foo_static PUBLIC ${object_link_libs})

但是加油，必须有更好的方法：/

but come on, there must be better way :/

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