Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -7158,6 +7158,7 @@
   }
 
   Args.AddAllArgs(CmdArgs, options::OPT_L);
+  Args.AddAllArgs(CmdArgs, options::OPT_u);
 
   const ToolChain::path_list Paths = ToolChain.getFilePaths();
 
Index: test/Driver/linux-ld.c
===================================================================
--- test/Driver/linux-ld.c
+++ test/Driver/linux-ld.c
@@ -1119,3 +1119,9 @@
 // RUN:        --sysroot=%S/Inputs/basic_linux_tree 2>& 1 \
 // RUN:   | FileCheck --check-prefix=CHECK-PG %s
 // CHECK-PG: gcrt1.o
+
+// GCC forwards -u to the linker.
+// RUN: %clang -u asdf --target=x86_64-unknown-linux -### %s \
+// RUN:        --sysroot=%S/Inputs/basic_linux_tree 2>& 1 \
+// RUN:   | FileCheck --check-prefix=CHECK-u %s
+// CHECK-u: "-u" "asdf"