Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -3905,6 +3905,8 @@
 def mzvector : Flag<["-"], "mzvector">, Alias<fzvector>;
 def mno_zvector : Flag<["-"], "mno-zvector">, Alias<fno_zvector>;
 
+def mxcoff_build_id_EQ : Joined<["-"], "mxcoff-build-id=">, Group<m_Group>, MetaVarName<"<0xHEXSTRING>">,
+  HelpText<"Request creation of a build-id string, \"0xHEXSTRING\", inside the linked binary">;
 def mignore_xcoff_visibility : Flag<["-"], "mignore-xcoff-visibility">, Group<m_Group>,
 HelpText<"Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file">,
   Flags<[CC1Option]>;
Index: clang/lib/Driver/ToolChains/AIX.cpp
===================================================================
--- clang/lib/Driver/ToolChains/AIX.cpp
+++ clang/lib/Driver/ToolChains/AIX.cpp
@@ -143,6 +143,21 @@
        Args.hasArg(options::OPT_coverage))
     CmdArgs.push_back("-bdbg:namedsects:ss");
 
+  if (Arg *A =
+          Args.getLastArg(clang::driver::options::OPT_mxcoff_build_id_EQ)) {
+    StringRef BuildId = A->getValue();
+    if (BuildId[0] != '0' || BuildId[1] != 'x' ||
+        BuildId.find_if_not(llvm::isHexDigit, 2) != StringRef::npos)
+      ToolChain.getDriver().Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << BuildId;
+    else {
+      bool PrependZero = BuildId.size() % 2; // To make it even # of digits.
+      CmdArgs.push_back(Args.MakeArgString(
+          llvm::Twine("-bdbg:ldrinfo:xcoff_binary_id:0x") +
+          (PrependZero ? "0" : "") + BuildId.drop_front(2).lower()));
+    }
+  }
+
   // Specify linker output file.
   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
   if (Output.isFilename()) {
Index: clang/test/Driver/xcoff-build-id.c
===================================================================
--- /dev/null
+++ clang/test/Driver/xcoff-build-id.c
@@ -0,0 +1,8 @@
+// RUN: touch %t.o
+// RUN: %clang --target=powerpc-ibm-aix -### %t.o -mxcoff-build-id=0x0011ffFF 2>&1 | FileCheck %s
+// RUN: %clang --target=powerpc-ibm-aix -### %t.o -mxcoff-build-id=0x011ffff 2>&1 | FileCheck %s
+// RUN: %clang --target=powerpc-ibm-aix -### %t.o -mxcoff-build-id=ff 2>&1 | FileCheck %s --check-prefix=BAD_INPUT
+// RUN: %clang --target=powerpc-ibm-aix -### %t.o -mxcoff-build-id=0x0z  2>&1 | FileCheck %s --check-prefix=BAD_INPUT
+
+CHECK: "-bdbg:ldrinfo:xcoff_binary_id:0x0011ffff"
+BAD_INPUT: clang: error: unsupported argument {{.*}} to option '-mxcoff-build-id='