ci: validate every member with mcpp 2026.9.29.1; latest_mcpp -> 2026.9.29.1

Author: Sunrisepeak

.github/workflows/validate.yml

@@ -377,7 +377,16 @@ env:
   # as its floor, and tests/examples/mcpp-plugins builds against it. Engine
   # warnings the members may newly print: W1 to W3 of SPEC-008 (the library
   # interface), warnings only.
-  MCPP_VERSION: "2026.9.28.3"
+  #
+  # 2026.9.29.1 (mcpp-community/mcpp#738) builds a workspace as one graph per
+  # configuration: `mcpp test -p <member>` plans that member and what it
+  # reaches in the workspace's build directory, `target/<triple>/<key>/` at
+  # this repository's root, with the member's products in `bin/<name>/`. The
+  # members' own `tests/examples/*/target/` directories are no longer written.
+  # The directory name no longer hashes a package's own flags, so a member
+  # whose flags differ from another's shares the directory and ninja rebuilds
+  # the commands that changed.
+  MCPP_VERSION: "2026.9.29.1"
 
 jobs:
   lint:

.mcpp/.xlings.json

@@ -0,0 +1,7 @@
+{
+  "index_repos": [
+    { "name": "compat", "url": "/tmp/claude-1000/idx/" }
+  ],
+  "lang": "en",
+  "mirror": "auto"
+}

.mcpp/.xlings/.xlings.json

@@ -0,0 +1,6 @@
+{
+  "configured": {
+    "compat:argparse@3.2": 0
+  },
+  "workspace": {}
+}

.mcpp/.xlings/data/compat

@@ -0,0 +1 @@
+/tmp/claude-1000/idx/

.mcpp/.xlings/data/runtimedir/v3.2.tar.gz

@@ -0,0 +1 @@
+1

.mcpp/.xlings/data/runtimedir/v3.2.tar.gz.lock

@@ -0,0 +1,7 @@
+{
+  "os": "linux",
+  "version": "3.2",
+  "xlings_version": "2026.9.29.1",
+  "registered": 0,
+  "revision": 0
+}

.mcpp/.xlings/data/xpkgs/compat-x-argparse/3.2/.mcpp_ok

@@ -0,0 +1,72 @@
+-- compat.argparse — p-ranav/argparse, a single-header command line parser.
+--
+-- Shape B: one header at `include/argparse/argparse.hpp`, so `include_dirs` is
+-- `*/include` and consumers write `#include <argparse/argparse.hpp>`.
+--
+-- The index's third answer to argument parsing, and they are not
+-- interchangeable: `compat.CLI11` is the large one (subcommands, config files,
+-- validators), `mcpplibs.cmdline` is the mcpp-native module, and this one is
+-- the small header that models an argument as a typed `add_argument(...)`
+-- chain and throws on a bad command line. A project already using it does not
+-- want to be told to rewrite its `main`.
+--
+-- Needs C++17; `language = "c++23"` here is the index's usual setting for a
+-- compat entry and does not force anything on a consumer's own dialect.
+--
+-- CN mirror: `gitcode.com/mcpp-res/argparse`, the upstream tarball re-hosted
+-- BYTE-IDENTICALLY (verified: the mirror's sha256 equals the one declared
+-- here, which is what lets one `sha256` serve both arms). GLOBAL stays the
+-- default; CN is the fallback `mcpp self config --mirror CN` selects.
+package = {
+    spec        = "1",
+    namespace   = "compat",
+    name        = "argparse",
+    description = "argparse — header-only argument parser for modern C++",
+    licenses    = {"MIT"},
+    repo        = "https://github.com/p-ranav/argparse",
+    type        = "package",
+
+    xpm = {
+        linux = {
+            ["3.2"] = {
+                url    = {
+                    GLOBAL = "https://github.com/p-ranav/argparse/archive/refs/tags/v3.2.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/argparse/releases/download/3.2/argparse-3.2.tar.gz",
+                },
+                sha256 = "9dcb3d8ce0a41b2a48ac8baa54b51a9f1b6a2c52dd374e28cc713bab0568ec98",
+            },
+        },
+        macosx = {
+            ["3.2"] = {
+                url    = {
+                    GLOBAL = "https://github.com/p-ranav/argparse/archive/refs/tags/v3.2.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/argparse/releases/download/3.2/argparse-3.2.tar.gz",
+                },
+                sha256 = "9dcb3d8ce0a41b2a48ac8baa54b51a9f1b6a2c52dd374e28cc713bab0568ec98",
+            },
+        },
+        windows = {
+            ["3.2"] = {
+                url    = {
+                    GLOBAL = "https://github.com/p-ranav/argparse/archive/refs/tags/v3.2.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/argparse/releases/download/3.2/argparse-3.2.tar.gz",
+                },
+                sha256 = "9dcb3d8ce0a41b2a48ac8baa54b51a9f1b6a2c52dd374e28cc713bab0568ec98",
+            },
+        },
+    },
+
+    mcpp = {
+        language     = "c++23",
+        import_std   = false,
+        c_standard   = "c11",
+        include_dirs = { "*/include" },
+        generated_files = {
+            ["mcpp_generated/argparse_anchor.c"] =
+                "int mcpp_compat_argparse_anchor(void) { return 0; }\n",
+        },
+        sources      = { "mcpp_generated/argparse_anchor.c" },
+        targets      = { ["argparse"] = { kind = "lib" } },
+        deps         = { },
+    },
+}

.mcpp/.xlings/data/xpkgs/compat-x-argparse/3.2/.xpkg-install.json

@@ -0,0 +1,8 @@
+build --enable_platform_specific_config
+
+build:linux --cxxopt=-std=c++17
+
+build:windows --copt=/utf-8
+build:windows --copt=/Zc:preprocessor
+build:windows --cxxopt=/std:c++17
+build:windows --cxxopt=/Zc:__cplusplus