binary target 无法 add_deps 一个 static / shared target

[TOMO-CAT]

Xmake 版本

xmake v2.8.9+dev.50dbca648

操作系统版本和架构

Linux 720ce3a659a2 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

描述问题

当我基于多个 object target 组成一个 static / shared target：

在尝试 add_deps 这个 static / shard target 时会发现不会自动 -lxxxx：

手动补上对应的链接参数可以正常编译运行：

期待的结果

我猜是因为我这个 static target 只是聚合多个 object targets，没有自己的 cc 文件触发的 bug？希望可以 add_deps 引用 static target。

工程配置

可以复现的最小 demo：

https://github.com/TOMO-CAT/xmake-template/blob/main/missed_static_deps/xmake.lua

附加信息和错误日志

$ xmake --version
xmake v2.8.9+dev.50dbca648, A cross-platform build utility based on Lua
Copyright (C) 2015-present Ruki Wang, tboox.org, xmake.io
                         _
    __  ___ __  __  __ _| | ______
    \ \/ / |  \/  |/ _  | |/ / __ \
     >  <  | \__/ | /_| |   <  ___/
    /_/\_\_|_|  |_|\__ \|_|\_\____|
                         by ruki, xmake.io
    
    👉  Manual: https://xmake.io/#/getting_started
    🙏  Donate: https://xmake.io/#/sponsor

[star-hengxing]

给 util 加上 add_rules("c++")。因为该 target 没有 add_files，所以没去应用这个 rule。
我认为这不是 xmake 的 bug，因为 obj 文件也可以来自其他 native 语言，而 target 不应该知道自己会给谁调用

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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Add add_rules("c++") to util. Because the target does not have add_files, this rule is not applied.
I think this is not a bug of xmake, because the obj file can also come from other native languages, and the target should not know who it will call

[waruqi]

嗯，没任何 cpp 文件，是无法自动识别当前 target 是 c++ 项目，也就没法走 c++ 的静态库继承逻辑，只能显式通过 add_rules("c++") 配置下，或者加个空的 cpp 文件

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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Well, without any cpp file, it is impossible to automatically identify that the current target is a C++ project, so there is no way to use the static library inheritance logic of C++. It can only be configured explicitly through add_rules("c++")

[TOMO-CAT]

嗯，没任何 cpp 文件，是无法自动识别当前 target 是 c++ 项目，也就没法走 c++ 的静态库继承逻辑，只能显式通过 add_rules("c++") 配置下，或者加个空的 cpp 文件

好的，加上后 ok 了。

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

Well, without any cpp file, it is impossible to automatically recognize that the current target is a C++ project, so there is no way to use the static library inheritance logic of C++. You can only explicitly configure it through add_rules("c++"), or add an empty cpp file

Okay, after adding it it’s ok.