Support shared ggml library

Author: ysimonson

llama-cpp-2/Cargo.toml

@@ -32,6 +32,7 @@ sampler = []
 # Only has an impact on Android.
 android-shared-stdcxx = ["llama-cpp-sys-2/shared-stdcxx"]
 mtmd = ["llama-cpp-sys-2/mtmd"]
+shared-ggml = ["llama-cpp-sys-2/shared-ggml"]
 
 
 [target.'cfg(all(target_os = "macos", any(target_arch = "aarch64", target_arch = "arm64")))'.dependencies]

llama-cpp-sys-2/Cargo.toml

@@ -80,4 +80,5 @@ native = []
 openmp = []
 # Only has an impact on Android.
 shared-stdcxx = []
+shared-ggml = []
 mtmd = []

llama-cpp-sys-2/build.rs

@@ -686,6 +686,10 @@ fn main() {
         config.define("GGML_OPENMP", "OFF");
     }
 
+    if cfg!(feature = "shared-ggml") {
+        config.define("LLAMA_USE_SYSTEM_GGML", "ON");
+    }
+
     // General
     config
         .profile(&profile)