--- a/toolkit/library/StaticXULComponentsEnd/StaticXULComponentsEnd.cpp
+++ b/toolkit/library/StaticXULComponentsEnd/StaticXULComponentsEnd.cpp
@@ -4,13 +4,18 @@
  * on Windows. Somehow, placing the object last is not enough with PGO/LTCG. */
 #ifdef _MSC_VER
 /* Sections on Windows are in two parts, separated with $. When linking,
  * sections with the same first part are all grouped, and ordered
  * alphabetically with the second part as sort key. */
 #  pragma section(".kPStaticModules$Z", read)
 #  undef NSMODULE_SECTION
 #  define NSMODULE_SECTION __declspec(allocate(".kPStaticModules$Z"), dllexport)
+#elif MOZ_LTO
+/* Clang+lld with LTO does not order modules correctly either, but fortunately
+ * the same trick works. */
+#  undef NSMODULE_SECTION
+#  define NSMODULE_SECTION __attribute__((section(".kPStaticModules$Z"), visibility("default")))
 #endif
 /* This could be null, but this needs a dummy value to ensure it actually ends
  * up in the same section as other NSMODULE_DEFNs, instead of being moved to a
  * separate readonly section. */
 NSMODULE_DEFN(end_kPStaticModules) = (mozilla::Module*)&NSMODULE_NAME(end_kPStaticModules);