diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3405,6 +3405,7 @@
   HelpText<"Overlay the virtual filesystem described by file over the real file system. "
            "Additionally, pass this overlay file to the linker if it supports it">;
 def imultilib : Separate<["-"], "imultilib">, Group<gfortran_Group>;
+def K : Flag<["-"], "K">, Flags<[LinkerInput]>;
 def keep__private__externs : Flag<["-"], "keep_private_externs">;
 def l : JoinedOrSeparate<["-"], "l">, Flags<[LinkerInput, RenderJoined]>,
         Group<Link_Group>;
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -6328,6 +6328,10 @@
     }
   }
 
+  if (Arg *A = Args.getLastArg(options::OPT_K); A && !TC.getTriple().isOSAIX())
+    D.Diag(diag::err_drv_unsupported_opt_for_target)
+        << A->getAsString(Args) << TripleStr;
+
   if (Args.getLastArg(options::OPT_fapple_kext) ||
       (Args.hasArg(options::OPT_mkernel) && types::isCXX(InputType)))
     CmdArgs.push_back("-fapple-kext");
diff --git a/clang/test/Driver/aix-ld.c b/clang/test/Driver/aix-ld.c
--- a/clang/test/Driver/aix-ld.c
+++ b/clang/test/Driver/aix-ld.c
@@ -1077,3 +1077,27 @@
 // RUN:        -fopenmp=libfoo \
 // RUN:   | FileCheck --check-prefixes=CHECK-FOPENMP-FOO %s
 // CHECK-FOPENMP-FOO: error: unsupported argument 'libfoo' to option '-fopenmp='
+
+// Check powerpc-ibm-aix7.1.0.0. -K is a passthrough linker option.
+// RUN: %clang %s 2>&1 -### \
+// RUN:        --target=powerpc-ibm-aix7.1.0.0 \
+// RUN:        --sysroot %S/Inputs/aix_ppc_tree \
+// RUN:        --unwindlib=libunwind \
+// RUN:        -K \
+// RUN:   | FileCheck --check-prefixes=CHECK-K %s
+// CHECK-K:     "-cc1" "-triple" "powerpc-ibm-aix7.1.0.0"
+// CHECK-K:     "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-K:     "{{.*}}ld{{(.exe)?}}"
+// CHECK-K:     "[[SYSROOT]]/usr/lib{{/|\\\\}}crt0.o"
+// CHECK-K:     "[[SYSROOT]]/usr/lib{{/|\\\\}}crti.o"
+// CHECK-K:     "-K"
+
+// Check powerpc-ibm-aix7.1.0.0. -K unused when not linking.
+// RUN: %clang %s 2>&1 -### \
+// RUN:        --target=powerpc-ibm-aix7.1.0.0 \
+// RUN:        --sysroot %S/Inputs/aix_ppc_tree \
+// RUN:        --unwindlib=libunwind \
+// RUN:        -K \
+// RUN:        -c \
+// RUN:   | FileCheck --check-prefixes=CHECK-K-UNUSED %s
+// CHECK-K-UNUSED: clang: warning: -K: 'linker' input unused [-Wunused-command-line-argument]