3 files changed, 16 insertions, 1 deletions
diff --git a/compiler/rustc_passes/messages.ftl b/compiler/rustc_passes/messages.ftl
index be50aad1303..d41cc724408 100644
--- a/compiler/rustc_passes/messages.ftl
+++ b/compiler/rustc_passes/messages.ftl
@@ -575,6 +575,11 @@ passes_outside_loop =
 
 passes_outside_loop_suggestion = consider labeling this block to be able to break within it
 
+passes_panic_unwind_without_std =
+    unwinding panics are not supported without std
+    .note = since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
+    .help = using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
+
 passes_params_not_allowed =
     referencing function parameters is not allowed in naked functions
     .help = follow the calling convention in asm block to use parameters
diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs
index d934e959a41..cf3c7cc4ace 100644
--- a/compiler/rustc_passes/src/errors.rs
+++ b/compiler/rustc_passes/src/errors.rs
@@ -813,6 +813,12 @@ pub struct UnknownExternLangItem {
 pub struct MissingPanicHandler;
 
 #[derive(Diagnostic)]
+#[diag(passes_panic_unwind_without_std)]
+#[help]
+#[note]
+pub struct PanicUnwindWithoutStd;
+
+#[derive(Diagnostic)]
 #[diag(passes_missing_lang_item)]
 #[note]
 #[help]
diff --git a/compiler/rustc_passes/src/weak_lang_items.rs b/compiler/rustc_passes/src/weak_lang_items.rs
index db3d442676e..4eb0c6c275e 100644
--- a/compiler/rustc_passes/src/weak_lang_items.rs
+++ b/compiler/rustc_passes/src/weak_lang_items.rs
@@ -9,7 +9,9 @@ use rustc_middle::middle::lang_items::required;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::config::CrateType;
 
-use crate::errors::{MissingLangItem, MissingPanicHandler, UnknownExternLangItem};
+use crate::errors::{
+    MissingLangItem, MissingPanicHandler, PanicUnwindWithoutStd, UnknownExternLangItem,
+};
 
 /// Checks the crate for usage of weak lang items, returning a vector of all the
 /// language items required by this crate, but not defined yet.
@@ -76,6 +78,8 @@ fn verify(tcx: TyCtxt<'_>, items: &lang_items::LanguageItems) {
         if missing.contains(&item) && required(tcx, item) && items.get(item).is_none() {
             if item == LangItem::PanicImpl {
                 tcx.dcx().emit_err(MissingPanicHandler);
+            } else if item == LangItem::EhPersonality {
+                tcx.dcx().emit_err(PanicUnwindWithoutStd);
             } else {
                 tcx.dcx().emit_err(MissingLangItem { name: item.name() });
             }