sanitizers: Fix tests/ui/sanitize/leak.rs fails on

Fix #111073 by checking if `-Zexport-executable-symbols` is passed when
LeakSanitizer is enabled.

compiler/rustc_session/messages.ftl

@@ -98,6 +98,8 @@ session_sanitizer_cfi_requires_single_codegen_unit = `-Zsanitizer=cfi` with `-Cl
 
 session_sanitizer_kcfi_requires_panic_abort = `-Z sanitizer=kcfi` requires `-C panic=abort`
 
+session_sanitizer_leak_requires_export_executable_symbols = `-Zsanitizer=leak` requires `-Zexport-executable-symbols`
+
 session_sanitizer_not_supported = {$us} sanitizer is not supported for this target
 
 session_sanitizers_not_supported = {$us} sanitizers are not supported for this target

compiler/rustc_session/src/errors.rs

@@ -127,6 +127,10 @@ pub(crate) struct CannotMixAndMatchSanitizers {
 #[diag(session_cannot_enable_crt_static_linux)]
 pub(crate) struct CannotEnableCrtStaticLinux;
 
+#[derive(Diagnostic)]
+#[diag(session_sanitizer_leak_requires_export_executable_symbols)]
+pub(crate) struct SanitizerLeakRequiresExportExecutableSymbols;
+
 #[derive(Diagnostic)]
 #[diag(session_sanitizer_cfi_requires_lto)]
 pub(crate) struct SanitizerCfiRequiresLto;

compiler/rustc_session/src/session.rs

@@ -390,6 +390,10 @@ impl Session {
         self.opts.unstable_opts.sanitizer.contains(SanitizerSet::KCFI)
     }
 
+    pub fn is_sanitizer_leak_enabled(&self) -> bool {
+        self.opts.unstable_opts.sanitizer.contains(SanitizerSet::LEAK)
+    }
+
     pub fn is_split_lto_unit_enabled(&self) -> bool {
         self.opts.unstable_opts.split_lto_unit == Some(true)
     }
@@ -1223,6 +1227,11 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
         sess.dcx().emit_err(errors::CannotEnableCrtStaticLinux);
     }
 
+    // LeakSanitizer requires export_executable_symbols.
+    if sess.is_sanitizer_leak_enabled() && !sess.opts.unstable_opts.export_executable_symbols {
+        sess.dcx().emit_err(errors::SanitizerLeakRequiresExportExecutableSymbols);
+    }
+
     // LLVM CFI requires LTO.
     if sess.is_sanitizer_cfi_enabled()
         && !(sess.lto() == config::Lto::Fat || sess.opts.cg.linker_plugin_lto.enabled())

tests/ui/sanitizer/leak-requires-export-executable-symbols.rs

@@ -0,0 +1,8 @@
+// Verifies that `-Zsanitizer=leak` requires `-Zexport-executable-symbols`.
+//
+//@ needs-sanitizer-leak
+//@ compile-flags: -Zsanitizer=leak
+
+#![feature(no_core)]
+#![no_core]
+#![no_main]

tests/ui/sanitizer/leak-requires-export-executable-symbols.stderr

@@ -0,0 +1,4 @@
+error: `-Zsanitizer=leak` requires `-Zexport-executable-symbols`
+
+error: aborting due to 1 previous error
+

tests/ui/sanitizer/unsupported-target.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -Z sanitizer=leak --target i686-unknown-linux-gnu
+//@ compile-flags: -Z sanitizer=leak -Zexport-executable-symbols --target i686-unknown-linux-gnu
 //@ needs-llvm-components: x86
 //@ error-pattern: error: leak sanitizer is not supported for this target
 #![feature(no_core)]