feat: add llamacpp 0.1.0 C++23 module package

mcpp.toml

@@ -42,6 +42,8 @@ members = [
     "tests/examples/freetype",
     "tests/examples/glad",
     "tests/examples/libpng",
+    "tests/examples/llamacpp",
+    "tests/examples/llamacpp-metal",
     "tests/examples/md4c",
     "tests/examples/spdlog-compiled",
     "tests/examples/tinyhttps",

pkgs/l/llamacpp.lua

@@ -0,0 +1,36 @@
+-- Form A descriptor: llama.cpp-m ships its own mcpp.toml and a vendored,
+-- pinned llama.cpp checkpoint. The default lookup finds that manifest inside
+-- the GitHub tag archive. CPU is the default backend; Metal is an additive
+-- package feature for macOS ARM64 consumers.
+package = {
+    spec        = "1",
+    name        = "llamacpp",
+    namespace   = "mcpplibs",
+    description = "C++23 module package for llama.cpp (import llamacpp)",
+    licenses    = {"MIT"},
+    repo        = "https://github.com/mcpplibs/llama.cpp-m",
+    type        = "package",
+
+    xpm = {
+        linux = {
+            ["0.1.0"] = {
+                url    = "https://github.com/mcpplibs/llama.cpp-m/archive/refs/tags/v0.1.0.tar.gz",
+                sha256 = "9af34d44349e520f2f9bd2eace29eb6a634ab4633a7f3bafa225f77be178ca84",
+            },
+        },
+        macosx = {
+            ["0.1.0"] = {
+                url    = "https://github.com/mcpplibs/llama.cpp-m/archive/refs/tags/v0.1.0.tar.gz",
+                sha256 = "9af34d44349e520f2f9bd2eace29eb6a634ab4633a7f3bafa225f77be178ca84",
+            },
+        },
+        windows = {
+            ["0.1.0"] = {
+                url    = "https://github.com/mcpplibs/llama.cpp-m/archive/refs/tags/v0.1.0.tar.gz",
+                sha256 = "9af34d44349e520f2f9bd2eace29eb6a634ab4633a7f3bafa225f77be178ca84",
+            },
+        },
+    },
+
+    -- No `mcpp` field: default lookup finds <verdir>/*/mcpp.toml.
+}

tests/examples/llamacpp-metal/mcpp.toml

@@ -0,0 +1,10 @@
+# Metal is supported only by the macOS ARM64 leg of the workspace matrix.
+[indices]
+default = { path = "../../.." }
+
+[package]
+name    = "llamacpp-metal-tests"
+version = "0.1.0"
+
+[target.'cfg(macos)'.dependencies]
+llamacpp = { version = "0.1.0", features = ["backend-metal"] }

tests/examples/llamacpp-metal/tests/backend.cpp

@@ -0,0 +1,23 @@
+import std;
+
+#if defined(__APPLE__) && defined(__aarch64__)
+import llamacpp;
+
+int main() {
+    llama_backend_init();
+    const bool metal_available = llama_supports_gpu_offload();
+    llama_backend_free();
+
+    if (!metal_available) {
+        std::cerr << "Metal backend is not available\n";
+        return 1;
+    }
+
+    std::cout << "LLAMACPP_METAL_INDEX_TEST=PASS\n";
+    return 0;
+}
+#else
+int main() {
+    return 0;
+}
+#endif

tests/examples/llamacpp/mcpp.toml

@@ -0,0 +1,16 @@
+# Resolve the public default-namespace package from this checkout.
+[indices]
+default = { path = "../../.." }
+
+[package]
+name    = "llamacpp-tests"
+version = "0.1.0"
+
+[target.'cfg(linux)'.dependencies]
+llamacpp = "0.1.0"
+
+[target.'cfg(macos)'.dependencies]
+llamacpp = "0.1.0"
+
+[target.'cfg(windows)'.dependencies]
+llamacpp = "0.1.0"

tests/examples/llamacpp/tests/api.cpp

@@ -0,0 +1,35 @@
+import std;
+import llamacpp;
+
+int main() {
+    static_assert(LLAMA_DEFAULT_SEED == 0xFFFFFFFFu);
+    static_assert(LLAMA_TOKEN_NULL == llama_token{-1});
+
+    llama_backend_init();
+
+    const auto model_params = llama_model_default_params();
+    const bool gpu_offload_available = llama_supports_gpu_offload();
+    llama_sampler * chain = llama_sampler_chain_init(
+        llama_sampler_chain_default_params()
+    );
+    llama_sampler * greedy = llama_sampler_init_greedy();
+
+    if (!chain || !greedy) {
+        if (chain) {
+            llama_sampler_free(chain);
+        } else if (greedy) {
+            llama_sampler_free(greedy);
+        }
+        llama_backend_free();
+        return 1;
+    }
+
+    llama_sampler_chain_add(chain, greedy);
+    llama_sampler_free(chain);
+    llama_backend_free();
+
+    std::cout << "gpu_offload_available=" << gpu_offload_available
+              << " default_gpu_layers=" << model_params.n_gpu_layers << '\n'
+              << "LLAMACPP_INDEX_TEST=PASS\n";
+    return 0;
+}