mcpp projects: no root compile_commands.json by default; read mcpp's result record for fallback and refresh
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评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 45/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- cpp
调研方向
Read src/project/mcpp.cppm at McppProvider::describe and the referenced mcpp design sections §7 and §5.2. Trace how the fallback selects a compilation database and how build refresh is forwarded by the editor extension; check the CLion e2e coverage. Done means the result record pointer is preferred, the root database remains a compatibility fallback, and the proposed refresh and CLion behavior are covered.
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描述
Context
The next mcpp release changes two things mcppls touches on mcpp projects (design: mcpp/.agents/docs/2026-10-26-control-contract-runtime-and-ide-ecosystem-design.md, §7 and §5.2):
- The project-root
compile_commands.jsonis no longer written by default. It becomes opt-in through[build] compile_commands = "<path>"inmcpp.toml(or a default in~/.mcpp/config.toml). An existing root copy is no longer updated, and mcpp prints a one-time note. The per-configuration database (target/<triple>/<fp>/compile_commands.json) stays. - mcpp writes a result record after every build (
target/<triple>/<fp>/result.json, kindmcpp.result), plus a project-level pointertarget/.last-result.jsonnaming the most recent configuration. The record carries the configuration's compile database path, the diagnostics, and the artifacts.
What this means for mcppls
- Fallback path.
McppProvider::describefalls back to a leftover rootcompile_commands.jsonwhen mcpp cannot be asked (src/project/mcpp.cppm:41). After the change, that file is usually absent. The fallback should read the database named bytarget/.last-result.jsonfirst, and the root file only when the pointer is missing (older mcpp). - Refresh after a build. Watching
target/.last-result.json(written by atomic rename) tells mcppls that a build finished, whoever ran it: a terminal, an agent's shell, or an IDE. Today the refresh is forwarded by the editor extension. - CLion. Without a root
compile_commands.json, CLion no longer loads an mcpp project as a Compilation Database workspace, soClionModelno longer treats it as CLion's and mcppls starts by default. No code change is expected; an e2e assertion would pin it.
Nothing breaks immediately: the primary path (mcpp emit build-database) is unchanged. This issue tracks adopting the result record when that mcpp release ships.
- 主要语言
- C++
- 星标
- 25
- 派生
- 2
- 平均合并
- 21 小时 5 分钟
- 30 天内合并 PR
- 13
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- 没有 Dockerfile 或 Docker Compose 文件
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