1 files changed, 13 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index b6ba6cc1dd6..0f6a3ddccba 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -672,6 +672,9 @@ impl Session {
     pub fn is_nightly_build(&self) -> bool {
         self.opts.unstable_features.is_nightly_build()
     }
+    pub fn is_sanitizer_cfi_enabled(&self) -> bool {
+        self.opts.debugging_opts.sanitizer.contains(SanitizerSet::CFI)
+    }
     pub fn overflow_checks(&self) -> bool {
         self.opts
             .cg
@@ -1398,6 +1401,16 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
                                 disable it using `-C target-feature=-crt-static`",
         );
     }
+
+    // LLVM CFI requires LTO.
+    if sess.is_sanitizer_cfi_enabled() {
+        if sess.opts.cg.lto == config::LtoCli::Unspecified
+            || sess.opts.cg.lto == config::LtoCli::No
+            || sess.opts.cg.lto == config::LtoCli::Thin
+        {
+            sess.err("`-Zsanitizer=cfi` requires `-Clto`");
+        }
+    }
 }
 
 /// Holds data on the current incremental compilation session, if there is one.