Index: contrib/llvm/tools/lld/ELF/Config.h
===================================================================
--- contrib/llvm/tools/lld/ELF/Config.h
+++ contrib/llvm/tools/lld/ELF/Config.h
@@ -156,6 +156,7 @@
   bool ZExecstack;
   bool ZHazardplt;
   bool ZIfuncnoplt;
+  bool ZInterpose;
   bool ZNocopyreloc;
   bool ZNodelete;
   bool ZNodlopen;
Index: contrib/llvm/tools/lld/ELF/Driver.cpp
===================================================================
--- contrib/llvm/tools/lld/ELF/Driver.cpp
+++ contrib/llvm/tools/lld/ELF/Driver.cpp
@@ -672,6 +672,7 @@
   Config->ZExecstack = hasZOption(Args, "execstack");
   Config->ZHazardplt = hasZOption(Args, "hazardplt");
   Config->ZIfuncnoplt = hasZOption(Args, "ifunc-noplt");
+  Config->ZInterpose = hasZOption(Args, "interpose");
   Config->ZNocopyreloc = hasZOption(Args, "nocopyreloc");
   Config->ZNodelete = hasZOption(Args, "nodelete");
   Config->ZNodlopen = hasZOption(Args, "nodlopen");
Index: contrib/llvm/tools/lld/ELF/SyntheticSections.cpp
===================================================================
--- contrib/llvm/tools/lld/ELF/SyntheticSections.cpp
+++ contrib/llvm/tools/lld/ELF/SyntheticSections.cpp
@@ -1190,6 +1190,8 @@
   uint32_t DtFlags1 = 0;
   if (Config->Bsymbolic)
     DtFlags |= DF_SYMBOLIC;
+  if (Config->ZInterpose)
+    DtFlags1 |= DF_1_INTERPOSE;
   if (Config->ZNodelete)
     DtFlags1 |= DF_1_NODELETE;
   if (Config->ZNodlopen)
Index: usr.bin/clang/lld/ld.lld.1
===================================================================
--- usr.bin/clang/lld/ld.lld.1
+++ usr.bin/clang/lld/ld.lld.1
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 22, 2018
+.Dd September 14, 2018
 .Dt LD.LLD 1
 .Os
 .Sh NAME
@@ -450,6 +450,12 @@
 Note that this feature requires special loader support and will
 generally result in application crashes when used outside of freestanding
 environments.
+.It Cm interpose
+Set the
+.Dv DF_1_INTERPOSE
+flag to inticate that the object is an interposer.
+Runtime linkers perform symbol resolution by first searching the application
+followed by interposers and then any other dependencies.
 .It Cm muldefs
 Do not error if a symbol is defined multiple times.
 The first definition will be used.