Merge pull request #1179 from alex/patch-1

Don't consider it cross-compilation when building for 32-bit Windows on 64-bit windows

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+### Changed
+### Removed
+### Fixed
+- Fix building for a 32-bit Python on 64-bit Windows with a 64-bit Rust toolchain. [#1179](https://github.com/PyO3/pyo3/pull/1179)
 
 ## [0.12.0] - 2020-09-12
 ### Added

build.rs

@@ -148,7 +148,9 @@ impl CrossCompileConfig {
 }
 
 fn cross_compiling() -> Result<Option<CrossCompileConfig>> {
-    if env::var("TARGET")? == env::var("HOST")? {
+    let target = env::var("TARGET")?;
+    let host = env::var("HOST")?;
+    if target == host || (target == "i686-pc-windows-msvc" && host == "x86_64-pc-windows-msvc") {
         return Ok(None);
     }