diff -r 52b1745787cf -r d6a688186de0 mozilla-gcc9-lto.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mozilla-gcc9-lto.patch	Wed Dec 18 02:16:48 2019 +0100
@@ -0,0 +1,71 @@
+Workaround GCC/Clang6 not supporting class-temporary#6.7 [1]
+Bugs:
++ https://bugzilla.mozilla.org/show_bug.cgi?id=1601707
++ http://gcc.gnu.org/PR92831
++ https://bugzilla.redhat.com/show_bug.cgi?id=1779082
+
+[1] http://eel.is/c++draft/class.temporary#6.7
+
+diff --git a/dom/indexedDB/ActorsParent.cpp b/dom/indexedDB/ActorsParent.cpp
+--- a/dom/indexedDB/ActorsParent.cpp
++++ b/dom/indexedDB/ActorsParent.cpp
+@@ -24311,11 +24311,11 @@
+   // if we allow overwrite or not. By not allowing overwrite we raise
+   // detectable errors rather than corrupting data.
+   DatabaseConnection::CachedStatement stmt;
+-  const auto& optReplaceDirective = (!mOverwrite || keyUnset)
+-                                        ? NS_LITERAL_CSTRING("")
+-                                        : NS_LITERAL_CSTRING("OR REPLACE ");
+   rv = aConnection->GetCachedStatement(
+-      NS_LITERAL_CSTRING("INSERT ") + optReplaceDirective +
++      NS_LITERAL_CSTRING("INSERT ") +
++	  ((!mOverwrite || keyUnset)
++           ? NS_LITERAL_CSTRING("")
++           : NS_LITERAL_CSTRING("OR REPLACE ")) +
+           NS_LITERAL_CSTRING("INTO object_data "
+                              "(object_store_id, key, file_ids, data) "
+                              "VALUES (:") +
+@@ -26076,9 +26076,6 @@
+ 
+   const bool usingKeyRange = mOptionalKeyRange.isSome();
+ 
+-  const auto& indexTable = mCursor->mUniqueIndex
+-                               ? NS_LITERAL_CSTRING("unique_index_data")
+-                               : NS_LITERAL_CSTRING("index_data");
+ 
+   NS_NAMED_LITERAL_CSTRING(sortColumn, "sort_column");
+ 
+@@ -26099,7 +26096,9 @@
+                                  "object_data.file_ids, "
+                                  "object_data.data "
+                                  "FROM ") +
+-                             indexTable +
++                             (mCursor->mUniqueIndex
++                                 ? NS_LITERAL_CSTRING("unique_index_data")
++                                 : NS_LITERAL_CSTRING("index_data")) +
+                              NS_LITERAL_CSTRING(
+                                  " AS index_table "
+                                  "JOIN object_data "
+@@ -26198,9 +26197,6 @@
+ 
+   const bool usingKeyRange = mOptionalKeyRange.isSome();
+ 
+-  const auto& table = mCursor->mUniqueIndex
+-                          ? NS_LITERAL_CSTRING("unique_index_data")
+-                          : NS_LITERAL_CSTRING("index_data");
+ 
+   NS_NAMED_LITERAL_CSTRING(sortColumn, "sort_column");
+ 
+@@ -26218,7 +26214,10 @@
+                              NS_LITERAL_CSTRING(
+                                  "object_data_key "
+                                  " FROM ") +
+-                             table + NS_LITERAL_CSTRING(" WHERE index_id = :") +
++                             (mCursor->mUniqueIndex
++                                 ? NS_LITERAL_CSTRING("unique_index_data")
++                                 : NS_LITERAL_CSTRING("index_data")) +
++                             NS_LITERAL_CSTRING(" WHERE index_id = :") +
+                              kStmtParamNameId;
+ 
+   const auto keyRangeClause =
+