fix(sys): do not require -fapple-link-rtlib

it really is that shrimple

docs/content/perf/execution-providers.mdx

@@ -216,40 +216,6 @@ See [Runtime dylib loading](/setup/linking#runtime-dylib-loading) for more infor
 ### CUDA
 `ort` provides binaries for CUDA 12 with cuDNN 9.x only. Make sure the correct version of CUDA & cuDNN are installed and available on the `PATH`.
 
-### CoreML
-Statically linking to CoreML (the default behavior when using downloaded binaries) requires an additional Rust flag in order to link properly. You'll need to provide the flag `-C link-arg=-fapple-link-rtlib` to `rustc`. You can do this via a build script, an entry in [`.cargo/config.toml`](https://doc.rust-lang.org/cargo/reference/config.html), or an environment variable.
-
-<Tabs items={['Build script', 'Cargo config', 'Environment variable']}>
-    <Tabs.Tab title="Build script">
-        Add the following to the `build.rs` script of any **binary** crate that uses `ort`.
-
-        ```rust filename="build.rs" copy
-        fn main() {
-	        #[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))]
-            println!("cargo:rustc-link-arg=-fapple-link-rtlib");
-        }
-        ```
-
-        Library crates do not need this flag, and the usage of it in a library crate will not transitively apply to any binary crates dependent on it.
-    </Tabs.Tab>
-    <Tabs.Tab title="Cargo config">
-        See [Configuration: Hierarchical structure](https://doc.rust-lang.org/cargo/reference/config.html#hierarchical-structure) for more information on where the configuration file can be placed.
-
-        ```toml filename=".cargo/config.toml" copy
-        [target.aarch64-apple-darwin]
-        rustflags = ["-Clink-arg=-fapple-link-rtlib"]
-
-        [target.x86_64-apple-darwin]
-        rustflags = ["-Clink-arg=-fapple-link-rtlib"]
-        ```
-    </Tabs.Tab>
-    <Tabs.Tab title="Environment variable">
-        ```shell copy
-        $ RUSTFLAGS="-Clink-arg=-fapple-link-rtlib" cargo build
-        ```
-    </Tabs.Tab>
-</Tabs>
-
 ### WebGPU
 The WebGPU EP is **experimental** and may produce incorrect results/crashes; these issues should be reported upstream as there's unfortunately nothing we can do about them.
 

docs/content/troubleshooting/compiling.mdx

@@ -28,8 +28,5 @@ Recent versions of `ort` require `ndarray` `0.16`, whereas older versions (and t
 
 To fix this, upgrade your `ndarray` dependency to `0.16`; the new release features no breaking changes, although `.into_shape()` is deprecated; see [`ndarray`'s release notes](https://github.com/rust-ndarray/ndarray/releases/tag/0.16.0) for more information.
 
-## Undefined symbols: `___isPlatformVersionAtLeast`, referenced from...
-If you run into this issue compiling with CoreML for macOS/iOS, you'll need to add a `rustc` flag to your crate to get it to link properly. See [Execution providers > CoreML](/perf/execution-providers#coreml) for instructions on how to do so.
-
 ## Unresolved external symbol `__std_*`
 If you encounter these errors when linking on Windows, make sure your Visual Studio 2022 installation is up to date; at least version **17.11** is required when using default pyke binaries.

examples/async-gpt2-api/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-async-gpt2-api"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../", features = [ "fetch-models" ] }

examples/build.rs

@@ -1,5 +0,0 @@
-fn main() {
-	// Need this for CoreML. See: https://ort.pyke.io/perf/execution-providers#coreml
-	#[cfg(target_os = "macos")]
-	println!("cargo:rustc-link-arg=-fapple-link-rtlib");
-}

examples/cudarc/Cargo.toml

@@ -1,4 +1,5 @@
 [package]
+publish = false
 name = "example-cudarc"
 version = "0.1.0"
 edition = "2021"

examples/custom-ops/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-custom-ops"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../" }

examples/gpt2/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-gpt2"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../", features = [ "fetch-models" ] }

examples/model-info/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-model-info"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../" }

examples/modnet/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-modnet"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../", features = [ "fetch-models" ] }

examples/phi-3-vision/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-phi-3-vision"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../" }

examples/sentence-transformers/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-sentence-transformers"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../", features = [ "fetch-models" ] }

examples/training/Cargo.toml

@@ -3,7 +3,6 @@ publish = false
 name = "example-training"
 version = "0.0.0"
 edition = "2021"
-build = "../build.rs"
 
 [dependencies]
 ort = { path = "../../", features = [ "training" ] }

ort-sys/build.rs

@@ -1,6 +1,7 @@
 use std::{
 	env,
-	path::{Path, PathBuf}
+	path::{Path, PathBuf},
+	process::Command
 };
 
 #[allow(unused)]
@@ -144,6 +145,28 @@ fn add_search_dir<P: AsRef<Path>>(base: P) {
 	}
 }
 
+fn macos_rtlib_search_dir() -> Option<String> {
+	let output = Command::new(std::env::var("CC").unwrap_or_else(|_| "clang".to_string()))
+		.arg("--print-search-dirs")
+		.output()
+		.ok()?;
+	if !output.status.success() {
+		return None;
+	}
+
+	let stdout = String::from_utf8_lossy(&output.stdout);
+	for line in stdout.lines() {
+		if line.contains("libraries: =") {
+			let path = line.split('=').nth(1)?;
+			if !path.is_empty() {
+				return Some(format!("{path}/lib/darwin"));
+			}
+		}
+	}
+
+	None
+}
+
 fn static_link_prerequisites(using_pyke_libs: bool) {
 	let target_triple = env::var("TARGET").unwrap();
 
@@ -164,6 +187,10 @@ fn static_link_prerequisites(using_pyke_libs: bool) {
 
 	if target_triple.contains("apple") {
 		println!("cargo:rustc-link-lib=framework=Foundation");
+		if let Some(dir) = macos_rtlib_search_dir() {
+			println!("cargo:rustc-link-search={dir}");
+			println!("cargo:rustc-link-lib=clang_rt.osx");
+		}
 	}
 	if target_triple.contains("windows") && using_pyke_libs {
 		println!("cargo:rustc-link-lib=dxguid");