cmake：与STATIC IMPORTED库的链接失败 [英] cmake: linking against STATIC IMPORTED library fails

问题描述

我有一个供应商提供的静态库。

I have a vendor provided static library.

我添加了它作为 STATIC IMPORTED 并在目标上设置属性：

I have added it as a STATIC IMPORTED library target, and set properties on the target:

add_library(
    lime_api 
        STATIC 
        IMPORTED
    )

set_target_properties(
    lime_api 
        PROPERTIES 
        IMPORTED_LOCATION "${CMAKE_CURRENT_LIST_DIR}/trading/limeTradingApi.a"
    )

# users include "api/trading/limeTradingApi.h"
set_target_properties(
    lime_api 
        PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_LIST_DIR}/.."
    )

我在源代码树中的其他地方尝试链接到 lime_api ，我得到一个错误：

elsewhere in my source tree I try to link against lime_api, and I get an error:

/usr/bin/ld: cannot find -llime_api

我的源代码树看起来像这样：

My source tree looks like this:

src
|
+--- api
|    | 
|    +--- trading
|    |       - limeTradingApi.a
|    |       - limeTradingApi.h
|    |
|    +--- examples
|         |
|         +--- trading
|
+--- order
     |
     +--- example

奇怪的是有一个供应商提供的示例链接到此库，并且工作正常：

The strange thing is that there is a vendor provided example which links against this library, and that works fine:

api / examples / trading / CMakeLists.txt ：

api/examples/trading/CMakeLists.txt:

add_executable       (trading_demo exampleClient.cc)
target_link_libraries(trading_demo lime_api)           <-- this works

$ b < 我收到链接器错误。

order / CMakeLists.txt

order/CMakeLists.txt:

add_library(
        order
            STATIC
            ${SRCS}
        )
target_link_libraries(order lime_api)                  <-- this doesn't work

order / example / CMakeLists.txt ：

order/example/CMakeLists.txt:

add_executable       (order_example main.cpp)
target_link_libraries(order_example order)

问题： / h2>

为什么CMake 将链接的目标 lime_api 转换为 -llimeTradingApi.a 我的可执行文件？

Question:

Why doesn't CMake "convert" the linked target lime_api into -llimeTradingApi.a for my executable?

推荐答案

可视性问题与 IMPORTED 库目标。根据文档：

I suspect that you ran into a visibility problem with the IMPORTED library target. According to the documentation:

An IMPORTED library target references a library file located outside the
project. ... The target name has scope in the directory in which it is
created and below, but the GLOBAL option extends visibility.

这就是为什么正确的库路径用于内部 trading_demo target，但不适用于外部 order_example 目标。要解决此问题，添加 GLOBAL 选项应该足够了：

That's why the correct library path is used for the inner trading_demo target, but not for the outer order_example target. To fix the problem, adding the GLOBAL option should be sufficient:

add_library(lime_api STATIC IMPORTED GLOBAL)

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