From 82f4e57a2c3220efec6df9bddcbd4c29049f231c Mon Sep 17 00:00:00 2001
From: Jonas Platte <jplatte@matrix.org>
Date: Wed, 3 Aug 2022 12:58:02 +0200
Subject: [PATCH] feat(sled): Print a clear error message when attempting to
 build on wasm

---
 crates/matrix-sdk-sled/build.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 crates/matrix-sdk-sled/build.rs

diff --git a/crates/matrix-sdk-sled/build.rs b/crates/matrix-sdk-sled/build.rs
new file mode 100644
index 000000000..ea5f5a045
--- /dev/null
+++ b/crates/matrix-sdk-sled/build.rs
@@ -0,0 +1,17 @@
+use std::{env, process};
+
+fn main() {
+    let target_arch = env::var_os("CARGO_CFG_TARGET_ARCH");
+    if target_arch.map_or(false, |arch| arch == "wasm32") {
+        let err = "this crate does not support the target arch 'wasm32'";
+        eprintln!(
+            "\n\
+            ┏━━━━━━━━{pad}━┓\n\
+            ┃ error: {err} ┃\n\
+            ┗━━━━━━━━{pad}━┛\n\
+            ",
+            pad = "━".repeat(err.len()),
+        );
+        process::exit(1);
+    }
+}