Merge pull request #1514 from jameshilliard/cross-env-detection

Ensure we are cross compiling when any cross env variables are set.

CHANGELOG.md

@@ -48,6 +48,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fix inability to use a named lifetime for `&PyTuple` of `*args` in `#[pyfunction]`. [#1440](https://github.com/PyO3/pyo3/pull/1440)
 - Fix inability to add `#[text_signature]` to some `#[pyproto]` methods. [#1483](https://github.com/PyO3/pyo3/pull/1483)
 - Fix use of Python argument for #[pymethods] inside macro expansions. [#1505](https://github.com/PyO3/pyo3/pull/1505)
+- Always use cross-compiling configuration if any of the environment variables are set. [#1514](https://github.com/PyO3/pyo3/pull/1514)
 
 ## [0.13.2] - 2021-02-12
 ### Packaging

build.rs

@@ -142,6 +142,12 @@ impl CrossCompileConfig {
 }
 
 fn cross_compiling() -> Result<Option<CrossCompileConfig>> {
+    if env::var_os("PYO3_CROSS").is_none()
+        && env::var_os("PYO3_CROSS_LIB_DIR").is_none()
+        && env::var_os("PYO3_CROSS_INCLUDE_DIR").is_none()
+        && env::var_os("PYO3_CROSS_VERSION").is_none()
+        && env::var_os("PYO3_CROSS_PYTHON_VERSION").is_none()
+    {
         let target = env::var("TARGET")?;
         let host = env::var("HOST")?;
         if target == host {
@@ -158,6 +164,7 @@ fn cross_compiling() -> Result<Option<CrossCompileConfig>> {
             // Not cross-compiling to compile for x86-64 Python from macOS arm64
             return Ok(None);
         }
+
         if target == "aarch64-apple-darwin" && host == "x86_64-apple-darwin" {
             // Not cross-compiling to compile for arm64 Python from macOS x86_64
             return Ok(None);
@@ -173,6 +180,7 @@ fn cross_compiling() -> Result<Option<CrossCompileConfig>> {
             // e.g. x86_64-unknown-linux-musl on x86_64-unknown-linux-gnu host
             return Ok(None);
         }
+    }
 
     // Cross-compiling on any other platform
     Ok(Some(CrossCompileConfig::new()?))