fix: use PYO3_CROSS_LIB_DIR value as lib_dir when cross-compiling (#4350

) (#4389) Co-authored-by: Paul-Erwan RIO <paulerwan.rio@proton.me>
PyO3 · Oct 18, 2024 · dc415fa · dc415fa
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diff --git a/newsfragments/4389.fixed.md b/newsfragments/4389.fixed.md
@@ -0,0 +1 @@
+Fix invalid library search path `lib_dir` when cross-compiling.
diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
@@ -1438,7 +1438,10 @@ fn cross_compile_from_sysconfigdata(
 ) -> Result<Option<InterpreterConfig>> {
     if let Some(path) = find_sysconfigdata(cross_compile_config)? {
         let data = parse_sysconfigdata(path)?;
-        let config = InterpreterConfig::from_sysconfigdata(&data)?;
+        let mut config = InterpreterConfig::from_sysconfigdata(&data)?;
+        if let Some(cross_lib_dir) = cross_compile_config.lib_dir_string() {
+            config.lib_dir = Some(cross_lib_dir)
+        }
 
         Ok(Some(config))
     } else {