feat: add mcpp.toml for mcpp build support#16
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Wires libxpkg into the mcpp build system. Bumps version to 0.0.39 (continuing the existing 0.0.x series) and ships: - `mcpp.toml` — single `lib` target named `xpkg`, primary module at `src/xpkg.cppm` (matches the lib-root convention; tail segment of the package name `mcpplibs.xpkg` is `xpkg`). - `src/xpkg-lua-stdlib.cppm` — committed for mcpp builds. xmake regenerates this from `src/lua-stdlib/**/*.lua` via `before_build`, but mcpp doesn't have an equivalent codegen hook yet, so we ship the generated copy in the repo. Re-run the xmake target whenever the .lua sources change to keep both in sync. - depends on `mcpplibs.capi.lua = "0.0.3"` — the C++23 module wrapper for the Lua C API, indexed in mcpp-community/mcpp-index. Verified locally: `mcpp build` produces `target/.../bin/libxpkg.a` containing all five modules (xpkg, loader, index, executor, lua_stdlib) with the dependency on capi-lua + lua resolved transitively.
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Summary
Wires libxpkg into the mcpp build system on top of the existing xmake support.
mcpp.toml— singlelibtarget namedxpkg, primary module atsrc/xpkg.cppm(matches the lib-root convention since the package's tail segment isxpkg).mcpplibs.capi.lua = "0.0.3", indexed in mcpp-index.mcpp 0.0.3's transitive walker pulls
lua(Lua 5.4 C library) along the chain capi-lua → lua, so theimport mcpplibs.capi.lua;calls insidexpkg-loader.cppm/xpkg-executor.cppmresolve transparently.lua-stdlib codegen note
xmake regenerates
src/xpkg-lua-stdlib.cppmfromsrc/lua-stdlib/**/*.luaviabefore_build. mcpp doesn't have an equivalent pre-build hook yet, so the already-tracked generated copy insrc/xpkg-lua-stdlib.cppmis what mcpp builds against. Re-runxmake build mcpplibs-xpkg-lua-stdlibafter editing the .lua sources to keep both up to date.Test plan
mcpp buildproducestarget/.../bin/libxpkg.acontaining all five modules with deps resolved transitivelyv0.0.39so the tarball flows into mcpp-index