Merge pull request #391 from L-jasmine/feat/dynamic_link

Support dynamic link llama

Author: MarcusDunn

llama-cpp-2/Cargo.toml

@@ -17,6 +17,7 @@ tracing = { workspace = true }
 [features]
 cuda = ["llama-cpp-sys-2/cuda"]
 metal = ["llama-cpp-sys-2/metal"]
+dynamic_link = ["llama-cpp-sys-2/dynamic_link"]
 vulkan = ["llama-cpp-sys-2/vulkan"]
 native = ["llama-cpp-sys-2/native"]
 sampler = []

llama-cpp-sys-2/Cargo.toml

@@ -62,5 +62,6 @@ cuda = []
 f16c = []
 fma = []
 metal = []
+dynamic_link = []
 vulkan = []
 native = []

llama-cpp-sys-2/build.rs

@@ -86,11 +86,11 @@ compile_error!("feature \"vulkan\" cannot be enabled alongside other GPU based f
 
 static LLAMA_PATH: Lazy<PathBuf> = Lazy::new(|| PathBuf::from("./llama.cpp"));
 
-fn compile_bindings(out_path: &Path) {
+fn compile_bindings(out_path: &Path, llama_header_path: &Path) {
     println!("Generating bindings..");
     let bindings = bindgen::Builder::default()
-        .header(LLAMA_PATH.join("ggml.h").to_string_lossy())
-        .header(LLAMA_PATH.join("llama.h").to_string_lossy())
+        // .header(llama_header_path.join("ggml.h").to_string_lossy())
+        .header(llama_header_path.join("llama.h").to_string_lossy())
         .derive_partialeq(true)
         .allowlist_function("ggml_.*")
         .allowlist_type("ggml_.*")
@@ -670,18 +670,35 @@ fn compile_llama(mut cxx: Build, _out_path: impl AsRef<Path>) {
 }
 
 fn main() {
+    let out_path = PathBuf::from(env::var("OUT_DIR").expect("No out dir found"));
+
+    if cfg!(feature = "dynamic_link") {
+        println!("cargo:rustc-link-lib=llama");
+        println!("cargo:rustc-link-lib=ggml");
+
+        let llama_header_path = std::env::var("LLAMA_HEADE");
+        if let Ok(llama_header_path) = llama_header_path {
+            compile_bindings(&out_path, Path::new(&llama_header_path));
+        } else {
+            compile_bindings(&out_path, &LLAMA_PATH);
+        }
+
+        if let Ok(llama_lib_path) = std::env::var("LLAMA_LIB") {
+            println!("cargo:rustc-link-search={llama_lib_path}");
+        }
+        return;
+    }
+
     if std::fs::read_dir(LLAMA_PATH.as_path()).is_err() {
         panic!(
             "Could not find {}. Did you forget to initialize submodules?",
             LLAMA_PATH.display()
         );
     }
 
-    let out_path = PathBuf::from(env::var("OUT_DIR").expect("No out dir found"));
-
     println!("cargo:rerun-if-changed={}", LLAMA_PATH.display());
 
-    compile_bindings(&out_path);
+    compile_bindings(&out_path, &LLAMA_PATH);
 
     let mut cx = Build::new();
     let mut cxx = Build::new();