crepererum commented on code in PR #5030:
URL: https://github.com/apache/arrow-rs/pull/5030#discussion_r1380402269


##########
object_store/src/lib.rs:
##########
@@ -443,6 +453,13 @@
 ))]
 compile_error!("Features 'gcp', 'aws', 'azure', 'http' are not supported on 
wasm.");
 
+#[cfg(all(
+    feature = "cloud",
+    not(feature = "tls-native-roots"),
+    not(feature = "tls-webpki-roots"),
+))]
+compile_error!("Feature 'cloud' needs at a CA root feature, use either 
'tls-native-roots' or 'tls-webpki-roots'.");

Review Comment:
   Technically you could silently ignore that and do not use any CA source 
(apart from the manual one). However this leads to runtime errors ("invalid 
cert") and is likely surprising to many users (esp. if they don't test any real 
cloud store in CI), so I've opted for forcing people to make a choice during 
compilation time.



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