Disable winsqlite3 on 32 bit targets

Cargo.toml

@@ -72,6 +72,7 @@ bundled-windows = ["libsqlite3-sys/bundled-windows"]
 with-asan = ["libsqlite3-sys/with-asan"]
 column_decltype = []
 wasm32-wasi-vfs = ["libsqlite3-sys/wasm32-wasi-vfs"]
+# Note: doesn't support 32-bit.
 winsqlite3 = ["libsqlite3-sys/winsqlite3"]
 
 # Helper feature for enabling most non-build-related optional features

libsqlite3-sys/Cargo.toml

@@ -35,8 +35,13 @@ session = ["preupdate_hook", "buildtime_bindgen"]
 in_gecko = []
 with-asan = []
 wasm32-wasi-vfs = []
+
 # lowest version shipped with Windows 10.0.10586 was 3.8.8.3
-winsqlite3 = ["min_sqlite_version_3_7_16", "buildtime_bindgen"]
+#
+# Note that because `winsqlite3.dll` exports SQLite functions using a atypical
+# ABI on 32-bit systems, this is currently unsupported on these. This may change
+# in the future.
+winsqlite3 = ["min_sqlite_version_3_7_16"]
 
 [dependencies]
 openssl-sys = { version = "0.9", optional = true }

libsqlite3-sys/src/lib.rs

@@ -5,6 +5,9 @@
 #[cfg(feature = "bundled-sqlcipher-vendored-openssl")]
 extern crate openssl_sys;
 
+#[cfg(all(windows, feature = "winsqlite3", target_pointer_width = "32"))]
+compile_error!("The `libsqlite3-sys/winsqlite3` feature is not supported on 32 bit targets.");
+
 pub use self::error::*;
 
 use std::default::Default;