Resolve CAIRO_NATIVE_RUNTIME_LIBRARY relative path

docs/execution_walkthrough.md

@@ -206,7 +206,7 @@ Builtin stats: BuiltinStats { bitwise: 1, ec_op: 0, range_check: 1, pedersen: 0,
 ## The Cairo Native runtime
 Sometimes we need to use stuff that would be too complicated or error-prone to implement in MLIR, but that we have readily available from Rust. That's when we use the runtime library.
 
-When using the JIT it'll be automatically linked (if compiled with support for it, which is enabled by default). If using the AOT, the `CAIRO_NATIVE_RUNTIME_LIBDIR` environment variable will have to be modified to point to the directory that contains `libcairo_native_runtime.a`, which is built and placed in said folder by `make build`.
+When using the JIT it'll be automatically linked (if compiled with support for it, which is enabled by default). If using the AOT, the `CAIRO_NATIVE_RUNTIME_LIBRARY` environment variable will have to be modified to point to the `libcairo_native_runtime.a` file, which is built and placed in said folder by `make build`.
 
 Although it's implemented in Rust, its functions use the C ABI and have Rust's name mangling disabled. This means that to the extern observer it's technically indistinguishible from a library written in C. By doing this we're making the functions callable from MLIR.
 

scripts/bench-hyperfine.sh

@@ -90,7 +90,7 @@ run_bench() {
         -o "$OUTPUT_DIR/$base_name-march-native" \
         >> /dev/stderr
 
-    CAIRO_NATIVE_RUNTIME_LIBDIR="$ROOT_DIR/target/release" hyperfine \
+     hyperfine \
         --warmup 3 \
         --export-markdown "$OUTPUT_DIR/$base_name.md" \
         --export-json "$OUTPUT_DIR/$base_name.json" \

src/ffi.rs

@@ -29,6 +29,7 @@ use melior::ir::{Module, Type, TypeLike};
 use mlir_sys::{mlirLLVMStructTypeGetElementType, mlirTranslateModuleToLLVMIR};
 use std::{
     borrow::Cow,
+    env,
     ffi::{CStr, CString},
     io::Write,
     mem::MaybeUninit,
@@ -219,6 +220,28 @@ pub fn object_to_shared_lib(object: &[u8], output_filename: &Path) -> Result<()>
         }
     }
 
+    let runtime_library_path = if let Ok(extra_dir) = std::env::var("CAIRO_NATIVE_RUNTIME_LIBRARY")
+    {
+        let path = Path::new(&extra_dir);
+        if path.is_absolute() {
+            extra_dir
+        } else {
+            let mut absolute_path = env::current_dir()
+                .expect("Failed to get the current directory")
+                .join(path);
+            absolute_path = absolute_path
+                .canonicalize()
+                .expect("Failed to cannonicalize path");
+            String::from(
+                absolute_path
+                    .to_str()
+                    .expect("Absolute path contains non-utf8 characters"),
+            )
+        }
+    } else {
+        String::from("libcairo_native_runtime.a")
+    };
+
     let args: Vec<Cow<'static, str>> = {
         #[cfg(target_os = "macos")]
         {
@@ -236,14 +259,9 @@ pub fn object_to_shared_lib(object: &[u8], output_filename: &Path) -> Result<()>
                 "-o".into(),
                 Cow::from(output_path),
                 "-lSystem".into(),
+                Cow::from(runtime_library_path),
             ]);
 
-            if let Ok(extra_dir) = std::env::var("CAIRO_NATIVE_RUNTIME_LIBRARY") {
-                args.extend([Cow::from(extra_dir)]);
-            } else {
-                args.extend(["libcairo_native_runtime.a".into()]);
-            }
-
             args
         }
         #[cfg(target_os = "linux")]
@@ -261,14 +279,9 @@ pub fn object_to_shared_lib(object: &[u8], output_filename: &Path) -> Result<()>
                 Cow::from(output_path),
                 "-lc".into(),
                 Cow::from(file_path),
+                Cow::from(runtime_library_path),
             ]);
 
-            if let Ok(extra_dir) = std::env::var("CAIRO_NATIVE_RUNTIME_LIBRARY") {
-                args.extend([Cow::from(extra_dir)]);
-            } else {
-                args.extend(["libcairo_native_runtime.a".into()]);
-            }
-
             args
         }
         #[cfg(target_os = "windows")]