2 files changed, 15 insertions, 2 deletions
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 3ff91c0553a..e894e46a301 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -351,8 +351,7 @@ mod desc {
     pub const parse_panic_strategy: &str = "either `unwind` or `abort`";
     pub const parse_opt_panic_strategy: &str = parse_panic_strategy;
     pub const parse_relro_level: &str = "one of: `full`, `partial`, or `off`";
-    pub const parse_sanitizers: &str =
-        "comma separated list of sanitizers: `address`, `hwaddress`, `leak`, `memory` or `thread`";
+    pub const parse_sanitizers: &str = "comma separated list of sanitizers: `address`, `cfi`, `hwaddress`, `leak`, `memory` or `thread`";
     pub const parse_sanitizer_memory_track_origins: &str = "0, 1, or 2";
     pub const parse_cfguard: &str =
         "either a boolean (`yes`, `no`, `on`, `off`, etc), `checks`, or `nochecks`";
@@ -605,6 +604,7 @@ mod parse {
             for s in v.split(',') {
                 *slot |= match s {
                     "address" => SanitizerSet::ADDRESS,
+                    "cfi" => SanitizerSet::CFI,
                     "leak" => SanitizerSet::LEAK,
                     "memory" => SanitizerSet::MEMORY,
                     "thread" => SanitizerSet::THREAD,
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.