由“import std”引发的特殊需求

[KevinLenzz]

你在什么场景下需要该功能？

起因：
为了使用"import std"
我在xmake.lua里添加

set_languages("c++latest")
set_policy("build.c++.modules", true)
set_policy("build.c++.modules.std", true)

后，IDE内编辑器仍和未修改xmake.lua前一样实时语法检查报错：

使用CLion2025.2.3+mingw-builds-binaries x86_64-15.2.0-release-posix-seh-ucrt-rt_v13-rev0默认情况下：

（默认未打开标准库模块支持）

使用Visual Studio2026insider默认情况下：

（默认使用C++14）

CLion中，通过在CMakeLists手动添加

set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD "a9e1cf81-9932-4810-974b-6eccaf14e457")
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_SCAN_FOR_MODULES ON)
set(CMAKE_CXX_MODULE_STD ON)

解决
Visual Studio中，通过建立sln项目专门修改项目属性中"C++ 语言标准​"和"生成 ISO C++23 标准库模块​"解决，但xmake插件的build没开发集成于“生成”功能里。
都无法一条龙使用

Clion的clangd、Visual Studio的Intellisense都是内置于IDE里的
但是xmake.lua中添加set_languages("c++latest")后修改的是编译参数
并不会使得用于代码检查的语言服务器使用的语法版本改变
而且
xmake并不是万能的
在修改了其他文件完成自己需要的功能情况下
每次更改xmake.lua更新其他文件（CppProperties.json、compile_commands.json、CMakeLists）时会清除掉原来数据 写入了新数据，也就失去了那些文件中手动添加的属性

描述可能的解决方案

实现函数来修改语言服务器使用的语法版本
实现 允许在xmake.lua中直接修改CppProperties.json、CMakeLists部分内容 的功能
加强xmake.lua的项目配置能力

可以使整个工具链能够适用于编写最新C++版本的代码

描述你认为的候选方案

完善Clion里不使用CMake直接进行构建的流程

其他信息

No response

[Issues-translate-bot]

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Title: Special requirements caused by "import std"

In what scenario do you need this feature?

cause:
In order to use "import std"
I added in xmake.lua
set_languages("c++latest") set_policy("build.c++.modules", true) set_policy("build.c++.modules.std", true)
Finally, the IDE reports an error in real-time syntax checking.
In CLion, by adding it manually in CMakeLists
set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD "a9e1cf81-9932-4810-974b-6eccaf14e457") set(CMAKE_CXX_STANDARD 23) set(CMAKE_CXX_SCAN_FOR_MODULES ON) set(CMAKE_CXX_MODULE_STD ON)
solve
In Visual Studio, the problem can be solved by creating an sln project and specifically modifying the "C++ language standard" and "Generate ISO C++23 standard library module" in the project properties, but the build of the xmake plug-in has not been developed and integrated into the "generate" function.
None of them can be used in one go

Clion's clangd and Visual Studio's Intellisense are both built into the IDE.
However, after adding set_languages("c++latest") to xmake.lua, the compilation parameters are modified.
It does not change the syntax version used by the language server used for code checking.
and
xmake is not omnipotent
After modifying other files to complete the functions you need
Every time you change xmake.lua and update other files (CppProperties.json, compile_commands.json, CMakeLists), the original data will be cleared. When new data is written, the manually added attributes in those files will be lost.

Describe possible solutions

Implement functions to modify the syntax version used by the language server
Implement the function that allows direct modification of some contents of CppProperties.json and CMakeLists in xmake.lua
Strengthen the project configuration capabilities of xmake.lua

Can make the entire tool chain suitable for writing code with the latest C++ version

Describe your alternatives

Improve the process of building directly without using CMake in Clion

Other information

No response

[waruqi]

后，IDE内编辑器仍和未修改xmake.lua前一样实时语法检查报错：

这跟 xmake 有啥关系，intellisense 的事情

vscode 目前会自动生成 compile_commands，可以搭配 clangd 搞，clangd 是否很好支持 std modules，那就是 clangd 的事情了。

clion 插件目前不支持，clion 插件开发体验太差，intelisense 和 debug 不好搞，我也没空弄，xmake 菜单栏有个生成 compile_commands 或者生成 cmakelists来变相支持。或者提 pr 过来给支持上。

[Issues-translate-bot]

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After that, the editor in the IDE still reports the same real-time syntax check error as before xmake.lua was not modified:

What does this have to do with xmake? It’s about intellisense.

vscode currently automatically generates compile_commands, which can be used with clangd. Whether clangd supports std modules well is a matter for clangd.

The clion plug-in is currently not supported. The clion plug-in development experience is too poor. Intelisense and debug are difficult to handle and I don’t have time to do them. You can generate cmakelists to provide disguised support. Or submit a PR to support.