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[enhancement] 消费端 default-features 关闭语法(default = [...] 已有,但退不掉;挡住 compat.ffmpeg 裁剪档形态) #242
Description
诉求
Feature System v2 已支持包侧 default = [...] 默认激活集,但消费端没有
关闭默认集的语法(cargo 的 default-features = false 对应物)。没有它,
"默认 full + 可退到裁剪档"的包形态表达不出来:
场景(compat.ffmpeg 裁剪档,mcpp-index 规划中)
FFmpeg 全量直编(2281 TU)默认档已发布;想提供 decode-min 裁剪档:
- features 是加法语义 → 基础源集必须是 min、
fullfeature 补齐其余; - 已发布消费者(ffmpeg 模块包)期望全量 → 包侧
default = ["full"]保兼容; - 但 min 消费者需要
default-features = false才能退回基础集 —— 语法不存在。
期望的消费端拼写(参照 cargo):
[dependencies.compat]
ffmpeg = { version = "8.1.2", default-features = false } # min
ffmpeg = { version = "8.1.2", default-features = false, features = ["x264"] } # 精选关联
裁剪档还需要 per-profile config 快照(config_components.h 随组件集变化,
generated_files 不可 feature 化)——这部分打算用包内 build.mcpp 双快照选择解决,
不需要 mcpp 改动;唯一挡路的是本 issue 的消费端 opt-out。
环境
mcpp 0.0.97
Activity
chore(release): unify #230-#243 batch into a single 0.0.98 release
docs(governance): #230-#243 batch ledger + no-workaround policy + res…
feat(manifest): consumer-side default-features = false to opt out of …
docs(design): #243 feature-forwarding (dep/feat) design — design only…
chore(release): bump mcpp 0.0.98 -> 0.0.99 (#237 #241 #242 #238-diag)…
fix(features): converge feature request derivation onto the dependenc…
docs(governance): fill §4 unified architecture assessment + record co…
chore(release): unify #230-#243 batch into a single 0.0.98 release
Sunrisepeak commentedon Jul 18, 2026
Implemented in 0.0.98 (#245). Consumer
default-features = false(Cargo parity) via a singleseedDefaultgate; also converged transitive-edge honoring onto theDependencyEdgegraph (e2e 126 + 127).feat(build): #243 inject feature forwarding into the dependency-edge …
refactor(build): architecture-review pass — rsp path portability, one…
feat(build.mcpp): 机制架构落地 —— 指令表收敛、协议契约、host 工具、构建图节点、规则包 (2026.8.5.1) (…
fix: 「请求的版本 → 装好的目录」有两个调用方,而我先只修了一个
Resolve the target side once, and let every translation unit read it (#…