release: 2026.8.8.3 —— subos prepend 修复,xlings pin 2026.8.8.1

main 上唯一未发布的代码改动是 #383(subos 的 `prepend` 把调用方的值整个丢掉)。
解析结果是替换子进程变量的,所以对 PATH 形状的变量,丢掉的是用户的整条搜索路径。

同时把 xlings pin 从 2026.8.7.1 抬到 2026.8.8.1 —— 索引已收录,不再是「pin 到索引
前面会让 CI 装不到」的情况。

67 单测;e2e 200/201/86/29 通过。

Author: speak-agent

.github/actions/bootstrap-mcpp/action.yml

@@ -25,7 +25,7 @@ inputs:
     # `package.name`, so one of the two was simply unreachable — and which one
     # depended on the machine, which is why CI failed on `compat:lua` on
     # Windows and `mcpplibs.capi:lua` on Linux. Never pin below that.
-    default: '2026.8.7.1'
+    default: '2026.8.8.1'
   cache-target:
     description: also restore/save target/ (build artifacts + BMIs)
     required: false

.github/actions/setup-macos-llvm/action.yml

@@ -15,7 +15,7 @@ inputs:
     # Floor imposed by the index, not a routine bump — see
     # .github/actions/bootstrap-mcpp/action.yml for why 0.4.69 is required
     # (two packages named `lua` in one repo need openxlings/xlings#381).
-    default: '2026.8.7.1'
+    default: '2026.8.8.1'
 
 runs:
   using: composite

.github/workflows/bootstrap-macos.yml

@@ -17,7 +17,7 @@ jobs:
       # Dormant (workflow_dispatch only), but kept in step with the rest —
       # check_version_pins.sh holds it there. Floor: 0.4.69, below which the
       # index cannot resolve two packages that share a short name.
-      XLINGS_VERSION: '2026.8.7.1'
+      XLINGS_VERSION: '2026.8.8.1'
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/ci-fresh-install.yml

@@ -152,7 +152,7 @@ jobs:
         env:
           XLINGS_NON_INTERACTIVE: '1'
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.7.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.8.1
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror
@@ -292,7 +292,7 @@ jobs:
 
       - name: Install xlings + mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.7.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.8.1
           # Deliberately NOT writing to $GITHUB_PATH here. On container
           # images that declare no PATH in their config (opensuse/
           # tumbleweed), appending a single dir to GITHUB_PATH makes the
@@ -363,7 +363,7 @@ jobs:
           #             (older ones carry minos=15 and refuse to start).
           #   v0.4.51+: in-process sha256 — this image has no sha256sum
           #             binary, so pinned fetches failed before it.
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.7.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.8.1
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror

.github/workflows/ci-linux-e2e.yml

@@ -133,7 +133,7 @@ jobs:
 
       - name: Bootstrap xlings + released mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.7.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.8.1
           export PATH="$HOME/.xlings/subos/current/bin:$PATH"
           xlings update
           xlings install mcpp -y -g

.github/workflows/cross-build-test.yml

@@ -118,7 +118,7 @@ jobs:
           # release assets were uploaded in a broken state (records present,
           # blobs missing → 404 on GET); re-uploaded clean. The stale-INDEX
           # half is handled by the marker-clear below.
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \
@@ -255,7 +255,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \

.github/workflows/release.yml

@@ -96,7 +96,7 @@ jobs:
           # Pin xlings to a known-good version. The upstream install
           # script always grabs `latest` (no version override), so we
           # download + self-install manually to avoid broken releases.
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
@@ -288,7 +288,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \
@@ -358,11 +358,11 @@ jobs:
           # below are pinned to the same version as XLINGS_VERSION; they are
           # NOT interpolated from it, so check_version_pins.sh scans for them
           # explicitly (they were absent from the old lock-step comment).
-          XLA="xlings-2026.8.7.1-linux-aarch64.tar.gz"
+          XLA="xlings-2026.8.8.1-linux-aarch64.tar.gz"
           if curl -fsSL -o "/tmp/$XLA" \
-               "https://github.com/openxlings/xlings/releases/download/v2026.8.7.1/$XLA"; then
+               "https://github.com/openxlings/xlings/releases/download/v2026.8.8.1/$XLA"; then
             tar -xzf "/tmp/$XLA" -C /tmp
-            XLBIN=$(find /tmp/xlings-2026.8.7.1-linux-aarch64 -path '*/bin/xlings' -type f | head -1)
+            XLBIN=$(find /tmp/xlings-2026.8.8.1-linux-aarch64 -path '*/bin/xlings' -type f | head -1)
             if [ -n "$XLBIN" ]; then
               mkdir -p "$STAGING/$WRAPPER/registry/bin"
               cp "$XLBIN" "$STAGING/$WRAPPER/registry/bin/xlings"
@@ -440,7 +440,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             WORK=$(mktemp -d)
@@ -622,7 +622,7 @@ jobs:
         shell: bash
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.7.1'
+          XLINGS_VERSION: '2026.8.8.1'
         run: |
           # Captured before the `cd` below, in POSIX form: this step never
           # returns to the workspace, and GITHUB_WORKSPACE is a backslash

CHANGELOG.md

@@ -3,6 +3,26 @@
 > 本文件追踪 `mcpp-community/mcpp` 公开仓的版本演进。
 > 格式参考 [Keep a Changelog](https://keepachangelog.com/zh-CN/1.1.0/)。
 
+## [2026.8.8.3] — 2026-08-08
+
+### 修复
+
+- **subos 的 `prepend` 把调用方的值整个丢掉了(#382 顺带发现)。**
+
+  解析出的键值对是**替换**子进程里的变量的(作为 extraEnv 进去),而 `prepend` 只发出
+  声明值 —— 对 PATH 形状的变量,丢掉的是用户的整条搜索路径。现在它接在调用方的值
+  前面,且对已存在元素幂等(嵌套运行不会让列表增长)。空值不算「用户设过」。
+
+  同一处的 `set` **保持不变**。`set` 与「默认值」是两种意图:有些变量 subos 必须说了
+  算 —— 指向它自己 loader 配置的那类,用户 shell 里一个陈旧值就能把环境弄坏。而且
+  `envs` 的 op 词汇表是 xlings 的契约,消费方悄悄给一个 op 加第二种含义,会让同一个
+  subos 因为「由谁启动」而行为不同。#382 想要的「用户可覆盖的默认值」应由 xlings 新增
+  一个 op,mcpp 认它;因为 mcpp 会丢弃未知 op,那个 op 必须两侧同时到位。
+
+### 其他
+
+- xlings pin 提升到 2026.8.8.1。
+
 ## [2026.8.8.2] — 2026-08-08
 
 编译器交付的是**能力**,不是配置。设计与实测证据见

mcpp.toml

@@ -1,6 +1,6 @@
 [package]
 name        = "mcpp"
-version     = "2026.8.8.2"
+version     = "2026.8.8.3"
 description = "Modern C++ build & package management tool"
 license     = "Apache-2.0"
 authors     = ["mcpp-community"]

src/version.cppm

@@ -31,6 +31,6 @@ import std;
 
 export namespace mcpp {
 
-inline constexpr std::string_view MCPP_VERSION = "2026.8.8.2";
+inline constexpr std::string_view MCPP_VERSION = "2026.8.8.3";
 
 } // namespace mcpp