Get build to work on macOS

Author: hellais

Cargo.lock

@@ -18,3 +18,6 @@ bincode = {workspace = true}
 serde = {workspace = true}
 thiserror = {workspace = true}
 base64 = "0.22.1"
+
+[build-dependencies]
+pyo3-build-config = "0.28.3"

ooniauth-py/Cargo.toml

@@ -1,47 +1,19 @@
 // Build helper for plain Cargo workflows.
-// Maturin usually sets Python link flags; this script queries `python3-config`
-// and emits equivalent linker directives so `cargo build/test` can link PyO3.
-// This is needed because Cargo does not automatically inherit Maturin's linker setup.
-use std::process::Command;
-
 fn main() {
+    pyo3_build_config::add_extension_module_link_args();
+
     println!("cargo:rerun-if-env-changed=PYO3_PYTHON");
     println!("cargo:rerun-if-env-changed=PYTHON_SYS_EXECUTABLE");
 
-    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
-    if target_os != "macos" {
-        return;
-    }
-
-    let flags = python3_config_ldflags();
-    if let Some(flags) = flags {
-        emit_link_flags(&flags);
-    }
-}
-
-fn python3_config_ldflags() -> Option<String> {
-    run_python3_config(&["--embed", "--ldflags"]).or_else(|| run_python3_config(&["--ldflags"]))
-}
-
-fn run_python3_config(args: &[&str]) -> Option<String> {
-    let output = Command::new("python3-config").args(args).output().ok()?;
-    if !output.status.success() {
-        return None;
-    }
-    String::from_utf8(output.stdout).ok()
-}
-
-fn emit_link_flags(flags: &str) {
-    let mut iter = flags.split_whitespace().peekable();
-    while let Some(flag) = iter.next() {
-        if let Some(path) = flag.strip_prefix("-L") {
-            println!("cargo:rustc-link-search=native={path}");
-        } else if let Some(lib) = flag.strip_prefix("-l") {
-            println!("cargo:rustc-link-lib={lib}");
-        } else if flag == "-framework" {
-            if let Some(name) = iter.next() {
-                println!("cargo:rustc-link-lib=framework={name}");
-            }
-        }
-    }
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-env-changed=CC");
+    println!("cargo:rerun-if-env-changed=CFLAGS");
+    println!("cargo:rerun-if-env-changed=LDFLAGS");
+    println!("cargo:rerun-if-env-changed=RUSTFLAGS");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_10)");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_11)");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_12)");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_13)");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_14)");
+    println!("cargo:rustc-check-cfg=cfg(Py_3_15)");
 }