chore: xlings pin 2026.9.16.1 -> 2026.9.20.1

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: '2026.9.16.1'
+    default: '2026.9.20.1'
   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: '2026.9.16.1'
+    default: '2026.9.20.1'
   image:
     description: >
       The runner label the job runs on (macos-15, xcode-27). It is part of the

.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: '2026.9.16.1'
+      XLINGS_VERSION: '2026.9.20.1'
     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 v2026.9.16.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.20.1
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror
@@ -312,7 +312,7 @@ jobs:
 
       - name: Install xlings + mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.16.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.20.1
           # Deliberately NOT writing to $GITHUB_PATH here. On container
           # images that declare no PATH in their config (opensuse/
           # tumbleweed), appending a single dir to GITHUB_PATH makes the
@@ -403,7 +403,7 @@ jobs:
           #             (older ones carry minos=15 and refuse to start).
           #   v0.4.51+: in-process sha256 — this image has no sha256sum
           #             binary, so pinned fetches failed before it.
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.16.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.20.1
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror

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

@@ -384,7 +384,7 @@ jobs:
 
       - name: Bootstrap xlings + released mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.16.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.9.20.1
           export PATH="$HOME/.xlings/subos/current/bin:$PATH"
           xlings update
           xlings install mcpp -y -g

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

@@ -135,7 +135,7 @@ 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: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           bash "$GITHUB_WORKSPACE/.github/tools/fetch_release.sh" \
@@ -289,7 +289,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           bash "$GITHUB_WORKSPACE/.github/tools/fetch_release.sh" \

.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: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
@@ -314,7 +314,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           bash "$GITHUB_WORKSPACE/.github/tools/fetch_release.sh" \
@@ -385,7 +385,7 @@ 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-2026.9.16.1-linux-aarch64.tar.gz"
+          XLA="xlings-2026.9.20.1-linux-aarch64.tar.gz"
           # NOT fetch_release.sh: this asset is OPTIONAL and the `if` is the
           # point — an arch with no prebuilt xlings must fall through quietly,
           # while the helper retries a 404 five times before giving up. The one
@@ -394,9 +394,9 @@ jobs:
           # cover it.
           if curl -fsSL --retry 3 --retry-delay 2 --retry-all-errors \
                --connect-timeout 20 --max-time 600 -o "/tmp/$XLA" \
-               "https://github.com/openxlings/xlings/releases/download/v2026.9.16.1/$XLA"; then
+               "https://github.com/openxlings/xlings/releases/download/v2026.9.20.1/$XLA"; then
             tar -xzf "/tmp/$XLA" -C /tmp
-            XLBIN=$(find /tmp/xlings-2026.9.16.1-linux-aarch64 -path '*/bin/xlings' -type f | head -1)
+            XLBIN=$(find /tmp/xlings-2026.9.20.1-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"
@@ -474,7 +474,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             WORK=$(mktemp -d)
@@ -657,7 +657,7 @@ jobs:
         shell: bash
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.9.16.1'
+          XLINGS_VERSION: '2026.9.20.1'
         run: |
           # Captured before the `cd` below, in POSIX form: this step never
           # returns to the workspace, and GITHUB_WORKSPACE is a backslash

src/xlings/xlings.cppm

@@ -96,7 +96,14 @@ namespace pinned {
     // GitCode fell back to a git clone from GitHub instead of trying GLOBAL;
     // and an index refresh had no bound on a connection that went silent
     // after its handshake.
-    inline constexpr std::string_view kXlingsVersion   = "2026.9.16.1";
+    //
+    // Fifth, at 2026.9.20.1 (openxlings/xlings#610). Below it, the global
+    // workspace could be read out of a project's subos, and the derived shim
+    // table then removed every global entry a project did not declare; an
+    // install that failed to download could still print `installed`. mcpp
+    // drives xlings from inside project and sandbox subos, which is the
+    // position where the first misread applied.
+    inline constexpr std::string_view kXlingsVersion   = "2026.9.20.1";
     inline constexpr std::string_view kNasmVersion     = "3.02";
 }