mcpp-community
diff --git a/‎.agents/docs/2026-06-03-package-templates.md‎
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diff --git a/‎.agents/docs/2026-06-03-runtime-closure-and-toolchain-defaults.md‎
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diff --git a/‎src/build/flags.cppm‎
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diff --git a/‎src/build/plan.cppm‎
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@@ -0,0 +1,91 @@
+# mcpp 模板系统(package-based templates)— 设计 + TODO
+
+> 2026-06-03 · 状态:builtin 模板已实现;**package 模板为设计/TODO(本轮未实现)**
+> 关联:agentdocs/2026-06-03-capability-architecture-rfc.md §9
+
+## 目标
+
+`mcpp new` 的模板不应只有内置几种,而应**复用"库模型":一个库同时携带实现 + 示例 +
+可实例化模板**。让库作者把"上手骨架"和库一起分发,消费者一条命令拉起。
+
+```
+mcpp new myapp                                  # builtin: bin(默认)
+mcpp new myapp --template gui                   # builtin: imgui.app 窗口骨架(已实现)
+mcpp new myapp --template imgui@0.0.2:window    # package 模板(本设计)
+mcpp new myapp --template imgui:window          # 省略版本 = 最新
+```
+
+## 两层模型
+
+### 1) builtin 模板(已实现)
+- `--template bin|gui`,硬编码在 `src/cli.cppm cmd_new`。
+- 用途:无网络/零依赖即可起步;`gui` 给出 imgui.app Tier-0 骨架。
+- 这是 fallback,也是 package 模板的"标准库"等价物。
+
+### 2) package 模板(设计 / TODO)
+语法:`--template <pkg>[@<ver>]:<templatename>`。
+
+**库侧目录约定**(库仓库里新增 `templates/`):
+```
+imgui-m/
+├── src/                      # 库实现
+├── examples/                 # 可运行示例
+└── templates/
+    └── window/               # 模板名 = 目录名
+        ├── template.toml     # 模板元数据(见下)
+        ├── mcpp.toml.in      # 带占位符的清单
+        └── src/main.cpp.in   # 带占位符的源码
+```
+
+**template.toml**:
+```toml
+[template]
+name        = "window"
+description = "Minimal imgui.app window app"
+# 占位符 → 取值来源
+[template.vars]
+PROJECT     = "{{name}}"          # mcpp new 的 name
+IMGUI_VER   = "{{self.version}}"  # 该模板所属包的版本(自动)
+# 生成后提示
+post_message = "Edit src/main.cpp, then `mcpp run`."
+```
+
+**占位符渲染**:`{{name}}`、`{{self.version}}`、`{{self.name}}` 等;`.in` 后缀文件渲染后去掉 `.in`;非 `.in` 文件原样拷贝。
+
+### 解析与执行流程(core)
+1. 解析 `--template` 值:
+   - 不含 `:` → builtin(`bin`/`gui`)。
+   - 含 `:` → `pkg[@ver]:tmpl`。
+2. 经现有 fetcher/index 解析并下载该 `pkg@ver`(复用 `mcpp.pm` / `fetcher.cppm`)。
+3. 读取包内 `templates/<tmpl>/template.toml`;若缺失 → 报错并列出该包可用模板(`templates/*/`)。
+4. 渲染:对模板目录递归拷贝,`.in` 文件做占位符替换,写入新项目目录。
+5. 若模板 mcpp.toml 未声明对该库的依赖,自动注入 `[dependencies] <pkg> = "<ver>"`(让模板默认依赖它所属的库)。
+6. 打印 `template.post_message`。
+
+### 代码定位(实现时)
+- `src/cli.cppm cmd_new`:解析 `--template`,分流 builtin vs package。
+- 新增 `src/scaffold/template.cppm`:模板下载 + 渲染引擎(占位符、`.in` 处理)。
+- 复用:`src/fetcher.cppm` / `mcpp.pm.*`(下载包)、`src/manifest.cppm`(注入依赖)。
+- index:无需改 schema(模板随源码 tarball 分发,已在 `templates/`)。
+
+### 发现/列举
+- `mcpp new --list-templates <pkg>[@ver]`:下载并列出 `templates/*/` 及其 description。
+- `mcpp new --template <pkg>:`(空模板名)→ 同上列举提示。
+
+## 为什么这样设计(契合架构不变量)
+- I5 复杂度下沉:模板由库作者写一次,消费者一条命令继承。
+- I1/I4:`--template gui` builtin 保零配置;package 模板可被 `--list-templates` 解释。
+- 与 capability 模型正交:模板只是"起点物料",不改变解析/能力体系。
+
+## TODO(实现顺序)
+- [ ] T1 模板字符串解析 `pkg@ver:tmpl`(+ builtin 分流)。
+- [ ] T2 `template.cppm` 渲染引擎(`.in` + `{{var}}`)。
+- [ ] T3 接 fetcher 下载模板包 + 读取 `templates/<tmpl>/`。
+- [ ] T4 自动注入依赖 + post_message。
+- [ ] T5 `--list-templates`。
+- [ ] T6 imgui-m 仓增 `templates/window/`、`templates/headless/` 作为首批样例。
+- [ ] T7 文档 + `mcpp new --help` 更新。
+
+## 现状(本轮已落地)
+- builtin `--template bin|gui` 已实现并验证(`mcpp new x --template gui` → imgui.app 窗口骨架 → 直接出窗口)。
+- package 模板:本文件为设计与 TODO,留待后续实现。
@@ -0,0 +1,83 @@
+# mcpp core: runtime closure (rpath) + toolchain defaults
+
+> 2026-06-03 · part of the mcpp ecosystem打通 plan
+> Master plan: /home/speak/workspace/github/agentdocs/2026-06-03-mcpp-ecosystem-architecture-plan.md
+
+This change fixes two general, long-term issues that block "native + GUI"
+packages (e.g. the imgui module package) from working out of the box. Neither
+is a special-case for any one package.
+
+## R2 — dependency `[runtime] library_dirs` were dropped from binary RUNPATH
+
+### Symptom
+A fresh consumer that depends (transitively) on `compat.glfw` builds fine but
+`mcpp run` fails at window creation: `GLX: Failed to load GLX`.
+
+### Root cause (confirmed in source)
+- `compat.glx-runtime` (pulled in by `compat.glfw` on Linux) symlinks the host
+  GLVND/GL/GLX libraries into its install dir and declares
+  `[runtime] library_dirs = { mcpp_generated/glx_runtime/lib }`.
+- `src/build/plan.cppm` (~L220) already collects every dependency package's
+  `runtime.library_dirs` into `plan.runtimeLibraryDirs` (resolved to absolute).
+- BUT `src/build/flags.cppm` (~L258) built the produced binary's RUNPATH by
+  iterating only `plan.toolchain.linkRuntimeDirs` — i.e. the toolchain's own
+  runtime dirs. The dependency runtime dirs in `plan.runtimeLibraryDirs` were
+  never emitted as `-Wl,-rpath`. So the host-GL passthrough dir was not on the
+  binary's RUNPATH, and the dlopen()'d `libGL.so.1` / `libGLX.so.0` were
+  unreachable at run time.
+
+The dependency dirs were correctly used for the *build/process* environment but
+not baked into the *binary* — so anything reached via dlopen (GL/GLX, and any
+plugin-style runtime lib) failed.
+
+### Fix
+`src/build/flags.cppm`: iterate `plan.runtimeLibraryDirs` (the union of
+dependency runtime dirs + toolchain + payload) instead of
+`plan.toolchain.linkRuntimeDirs` when emitting `-L`/`-Wl,-rpath`. This is a
+superset, so toolchain dirs are still covered; it additionally bakes each
+dependency's declared runtime dir into RUNPATH.
+
+This is the correct general behavior: any package that declares
+`[runtime] library_dirs` is promising "binaries that use me need these dirs at
+run time"; the producer binary must carry them as RUNPATH.
+
+## R1 — fresh-machine bootstrap default toolchain was musl-static on Linux
+
+### Symptom
+On a clean machine, "First run no toolchain configured" auto-installs
+`gcc@15.1.0-musl` (musl, static). Building any package that links the glibc
+world (X11/GL/system libs) then fails, e.g. `libXdmcp` `arc4random_buf`
+implicit-declaration under musl.
+
+### Root cause
+`src/cli.cppm` (~L1390) hard-coded the Linux first-run default to
+`gcc@15.1.0-musl`.
+
+### Fix
+Default Linux first-run toolchain to the platform-native glibc gcc
+(`gcc@16.1.0`). musl-static remains fully available but **opt-in** via
+`mcpp build --target x86_64-linux-musl` (which the project already supports via
+`[target.x86_64-linux-musl]`). This mirrors Cargo/Rust: default triple is
+`-gnu` (glibc), `-musl` is an explicit target for portable static binaries.
+musl-static is a poor *default* because it cannot link the glibc/native world.
+
+## Why these are long-term/industrial, not workarounds
+- R2 makes the existing two-plane design actually work: the *host plane*
+  (drivers/GLVND, provided by `compat.glx-runtime`, never vendored) is bound to
+  the binary via RUNPATH, which is the standard ELF mechanism. No package code
+  changes; no env hacks.
+- R1 aligns the default with the platform-native ABI, the same principle Cargo
+  uses. Static/musl stays a first-class explicit option.
+
+## Test plan (acceptance, via imgui-m, no special-casing)
+1. Self-build mcpp with these changes.
+2. Fresh consumer: `mcpp new app && mcpp add imgui` then:
+   - `mcpp build` → uses glibc gcc by default (R1), no musl error.
+   - `readelf -d <bin>` → RUNPATH contains the `compat.glx-runtime` lib dir (R2).
+   - `mcpp run` → window opens, ImGui renders, no `GLX: Failed to load GLX`.
+3. `mcpp test` headless still passes on all platforms.
+
+## Follow-up (separate, tracked in master plan)
+- Declarative `abi` capability on native packages so the resolver *derives* the
+  ABI-correct toolchain instead of relying on a good default (defense in depth).
+- Capability→provider resolution for `opengl.glx.driver` (glvnd/cocoa/win32).
@@ -173,11 +173,25 @@ CompileFlags compute_flags(const BuildPlan& plan) {
         }
         f.sysroot = link_toolchain_flags;
     } else if (plan.toolchain.payloadPaths) {
-        // No sysroot but have payload paths: use -isystem.
+        // No usable sysroot: wire the C library headers from the payload.
+        // For GCC use -idirafter (appended after the built-in dirs) so that
+        // libstdc++'s #include_next wrappers can reach them; -isystem would
+        // place them BEFORE the built-ins, invisible to #include_next.
         auto& pp = *plan.toolchain.payloadPaths;
-        compile_toolchain_flags += " -isystem" + escape_path(pp.glibcInclude);
+        const bool clangTc = mcpp::toolchain::is_clang(plan.toolchain);
+        auto inc_flag = [&](const std::filesystem::path& p) {
+            return (clangTc ? " -isystem" : " -idirafter") + escape_path(p);
+        };
+        compile_toolchain_flags += inc_flag(pp.glibcInclude);
         if (!pp.linuxInclude.empty())
-            compile_toolchain_flags += " -isystem" + escape_path(pp.linuxInclude);
+            compile_toolchain_flags += inc_flag(pp.linuxInclude);
+        // Link-time C runtime: a usable --sysroot would have provided the
+        // startup objects and core libs implicitly. Without one, point the
+        // driver at the glibc payload lib dir: -B for crt1.o/crti.o discovery,
+        // -L for -lm/-lc resolution.
+        link_toolchain_flags += " -B" + escape_path(pp.glibcLib);
+        link_toolchain_flags += " -L" + escape_path(pp.glibcLib);
+        f.sysroot = link_toolchain_flags;
     }
 
     // Binutils -B flag
@@ -198,8 +212,14 @@ CompileFlags compute_flags(const BuildPlan& plan) {
     // AR binary
     f.arBinary = mcpp::toolchain::archive_tool(plan.toolchain);
 
-    // Opt level (musl ICE workaround)
-    std::string opt_flag = isMuslTc ? " -Og" : " -O2";
+    // Opt level + debug come from the resolved build profile
+    // ([profile.<name>] → buildConfig). musl keeps -Og as an ICE workaround
+    // unless the profile pins -O0.
+    auto& prof = plan.manifest.buildConfig;
+    std::string opt_flag = isMuslTc && prof.optLevel != "0"
+        ? " -Og" : (" -O" + prof.optLevel);
+    if (prof.debug) opt_flag += " -g";
+    if (prof.lto)   opt_flag += " -flto";
 
     // User link flags
     std::string user_ldflags;
@@ -256,10 +276,19 @@ CompileFlags compute_flags(const BuildPlan& plan) {
     std::string static_stdlib = (f.staticStdlib && !isClang && !mcpp::platform::is_windows) ? " -static-libstdc++" : "";
     std::string runtime_dirs;
     if constexpr (mcpp::platform::supports_rpath) {
+        // Toolchain runtime dirs (glibc/gcc) as before...
         for (auto& dir : plan.toolchain.linkRuntimeDirs) {
             runtime_dirs += " -L" + escape_path(dir);
             runtime_dirs += " -Wl,-rpath," + escape_path(dir);
         }
+        // ...plus dependency packages' [runtime] library_dirs (e.g.
+        // compat.glx-runtime's host-GL passthrough), so dlopen()'d host libs
+        // (libGL/libGLX) are reachable at run time. Only the dep dirs — NOT the
+        // glibc payload dir — so static/musl links stay clean.
+        for (auto& dir : plan.depRuntimeLibraryDirs) {
+            runtime_dirs += " -L" + escape_path(dir);
+            runtime_dirs += " -Wl,-rpath," + escape_path(dir);
+        }
     }
 
     // For Clang with payload paths: add glibc lib + dynamic linker to link flags.
@@ -273,13 +302,17 @@ CompileFlags compute_flags(const BuildPlan& plan) {
             payload_ld += " -Wl,--dynamic-linker=" + escape_path(loader);
     }
 
+    std::string link_extra;
+    if (prof.lto)   link_extra += " -flto";
+    if (prof.strip) link_extra += " -s";
+
     if constexpr (mcpp::platform::is_windows) {
-        f.ld = user_ldflags;
+        f.ld = user_ldflags + link_extra;
     } else if constexpr (mcpp::platform::needs_explicit_libcxx) {
-        f.ld = std::format("{}{}{} -lc++{}", full_static, static_stdlib, b_flag, user_ldflags);
+        f.ld = std::format("{}{}{} -lc++{}{}", full_static, static_stdlib, b_flag, user_ldflags, link_extra);
     } else {
-        f.ld = std::format("{}{}{}{}{}{}{}", full_static, static_stdlib, link_toolchain_flags, b_flag,
-                           runtime_dirs, payload_ld, user_ldflags);
+        f.ld = std::format("{}{}{}{}{}{}{}{}", full_static, static_stdlib, link_toolchain_flags, b_flag,
+                           runtime_dirs, payload_ld, user_ldflags, link_extra);
     }
 
     return f;
 
@@ -56,6 +56,17 @@ struct BuildPlan {
     std::vector<CompileUnit>        compileUnits;     // topologically sorted
     std::vector<LinkUnit>           linkUnits;
     std::vector<std::filesystem::path> runtimeLibraryDirs;
+    // ONLY the dependency packages' [runtime] library_dirs (not toolchain/
+    // payload dirs). These are the dirs that must be baked into the produced
+    // binary's RUNPATH (e.g. compat.glx-runtime). Kept separate so static/musl
+    // links don't pull the glibc payload dir.
+    std::vector<std::filesystem::path> depRuntimeLibraryDirs;
+    // Aggregated host-runtime requirements from dependency packages'
+    // [runtime] metadata. Capability/provider-driven — no platform special-casing
+    // in mcpp: providers (e.g. compat.glx-runtime) declare these per platform.
+    std::vector<std::string>           runtimeDlopenLibs;   // union of deps' dlopen sonames
+    std::vector<std::string>           runtimeCapabilities; // union of host capabilities
+    std::vector<std::pair<std::string, std::string>> runtimeProviders; // (capability, provider pkg)
 };
 
 // Build a BuildPlan from already-validated inputs.
@@ -219,8 +230,18 @@ BuildPlan make_plan(const mcpp::manifest::Manifest&         manifest,
 
     for (auto const& package : packages) {
         for (auto const& dir : package.manifest.runtimeConfig.libraryDirs) {
-            append_unique_path(plan.runtimeLibraryDirs,
-                dir.is_absolute() ? dir : package.root / dir);
+            auto abs = dir.is_absolute() ? dir : package.root / dir;
+            append_unique_path(plan.runtimeLibraryDirs, abs);
+            append_unique_path(plan.depRuntimeLibraryDirs, abs);
+        }
+        for (auto const& lib : package.manifest.runtimeConfig.dlopenLibs) {
+            if (std::ranges::find(plan.runtimeDlopenLibs, lib) == plan.runtimeDlopenLibs.end())
+                plan.runtimeDlopenLibs.push_back(lib);
+        }
+        for (auto const& cap : package.manifest.runtimeConfig.capabilities) {
+            if (std::ranges::find(plan.runtimeCapabilities, cap) == plan.runtimeCapabilities.end())
+                plan.runtimeCapabilities.push_back(cap);
+            plan.runtimeProviders.emplace_back(cap, package.manifest.package.name);
         }
     }
     // The same private runtime directories embedded as executable RUNPATH are