diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
--- a/lld/CMakeLists.txt
+++ b/lld/CMakeLists.txt
@@ -110,6 +110,10 @@
       set(LLVM_INCLUDE_TESTS OFF)
     endif()
   endif()
+
+  if(LLVM_HAVE_LIBXAR)
+    set(XAR_LIB xar)
+  endif()
 endif()
 
 set(LLD_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/lld/MachO/CMakeLists.txt b/lld/MachO/CMakeLists.txt
--- a/lld/MachO/CMakeLists.txt
+++ b/lld/MachO/CMakeLists.txt
@@ -48,6 +48,7 @@
   LINK_LIBS
   lldCommon
   ${LLVM_PTHREAD_LIB}
+  ${XAR_LIB}
 
   DEPENDS
   MachOOptionsTableGen
diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -31,7 +31,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/MachO.h"
 #include "llvm/BinaryFormat/Magic.h"
-#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/LTO/LTO.h"
 #include "llvm/Object/Archive.h"
 #include "llvm/Option/ArgList.h"
@@ -992,7 +992,7 @@
       args.hasFlag(OPT_encryptable, OPT_no_encryption,
                    is_contained(encryptablePlatforms, config->platform()));
 
-#ifndef HAVE_LIBXAR
+#ifndef LLVM_HAVE_LIBXAR
   if (config->emitBitcodeBundle)
     error("-bitcode_bundle unsupported because LLD wasn't built with libxar");
 #endif
diff --git a/lld/MachO/SyntheticSections.cpp b/lld/MachO/SyntheticSections.cpp
--- a/lld/MachO/SyntheticSections.cpp
+++ b/lld/MachO/SyntheticSections.cpp
@@ -20,7 +20,7 @@
 #include "lld/Common/ErrorHandler.h"
 #include "lld/Common/Memory.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/EndianStream.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/LEB128.h"
@@ -31,7 +31,7 @@
 #include <sys/mman.h>
 #endif
 
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
 #include <fcntl.h>
 #include <xar/xar.h>
 #endif
@@ -1036,7 +1036,7 @@
   } while (0);
 
 void BitcodeBundleSection::finalize() {
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
   using namespace llvm::sys::fs;
   CHECK_EC(createTemporaryFile("bitcode-bundle", "xar", xarPath));
 
@@ -1048,7 +1048,7 @@
   CHECK_EC(xar_close(xar));
 
   file_size(xarPath, xarSize);
-#endif // defined(HAVE_LIBXAR)
+#endif // defined(LLVM_HAVE_LIBXAR)
 }
 
 void BitcodeBundleSection::writeTo(uint8_t *buf) const {
diff --git a/lld/test/CMakeLists.txt b/lld/test/CMakeLists.txt
--- a/lld/test/CMakeLists.txt
+++ b/lld/test/CMakeLists.txt
@@ -11,7 +11,7 @@
   LLVM_ENABLE_ZLIB
   LLVM_ENABLE_LIBXML2
   LLD_DEFAULT_LD_LLD_IS_MINGW
-  HAVE_LIBXAR
+  LLVM_HAVE_LIBXAR
   )
 
 configure_lit_site_cfg(
diff --git a/lld/test/lit.site.cfg.py.in b/lld/test/lit.site.cfg.py.in
--- a/lld/test/lit.site.cfg.py.in
+++ b/lld/test/lit.site.cfg.py.in
@@ -15,7 +15,7 @@
 config.target_triple = "@TARGET_TRIPLE@"
 config.python_executable = "@Python3_EXECUTABLE@"
 config.have_zlib = @LLVM_ENABLE_ZLIB@
-config.have_libxar = @HAVE_LIBXAR@
+config.have_libxar = @LLVM_HAVE_LIBXAR@
 config.have_libxml2 = @LLVM_ENABLE_LIBXML2@
 config.sizeof_void_p = @CMAKE_SIZEOF_VOID_P@
 config.ld_lld_default_mingw = @LLD_DEFAULT_LD_LLD_IS_MINGW@
diff --git a/lld/tools/lld/CMakeLists.txt b/lld/tools/lld/CMakeLists.txt
--- a/lld/tools/lld/CMakeLists.txt
+++ b/lld/tools/lld/CMakeLists.txt
@@ -20,7 +20,7 @@
   lldWasm
   )
 
-if(HAVE_LIBXAR)
+if(LLVM_HAVE_LIBXAR)
   target_link_libraries(lld PRIVATE ${XAR_LIB})
 endif()
 
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -189,8 +189,8 @@
   set(LLVM_ENABLE_TERMINFO 0)
 endif()
 
-check_library_exists(xar xar_open "" HAVE_LIBXAR)
-if(HAVE_LIBXAR)
+check_library_exists(xar xar_open "" LLVM_HAVE_LIBXAR)
+if(LLVM_HAVE_LIBXAR)
   set(XAR_LIB xar)
 endif()
 
diff --git a/llvm/cmake/modules/LLVMConfig.cmake.in b/llvm/cmake/modules/LLVMConfig.cmake.in
--- a/llvm/cmake/modules/LLVMConfig.cmake.in
+++ b/llvm/cmake/modules/LLVMConfig.cmake.in
@@ -111,6 +111,8 @@
 set(LLVM_DEFAULT_EXTERNAL_LIT "@LLVM_CONFIG_DEFAULT_EXTERNAL_LIT@")
 set(LLVM_LIT_ARGS "@LLVM_LIT_ARGS@")
 
+set(LLVM_HAVE_LIBXAR "@LLVM_HAVE_LIBXAR@")
+
 if(NOT TARGET LLVMSupport)
   @LLVM_CONFIG_INCLUDE_EXPORTS@
   @llvm_config_include_buildtree_only_exports@
diff --git a/llvm/include/llvm/Config/config.h.cmake b/llvm/include/llvm/Config/config.h.cmake
--- a/llvm/include/llvm/Config/config.h.cmake
+++ b/llvm/include/llvm/Config/config.h.cmake
@@ -220,9 +220,6 @@
 /* Define if the setupterm() function is supported this platform. */
 #cmakedefine LLVM_ENABLE_TERMINFO ${LLVM_ENABLE_TERMINFO}
 
-/* Define if the xar_open() function is supported this platform. */
-#cmakedefine HAVE_LIBXAR ${HAVE_LIBXAR}
-
 /* Define to 1 if you have the <termios.h> header file. */
 #cmakedefine HAVE_TERMIOS_H ${HAVE_TERMIOS_H}
 
diff --git a/llvm/include/llvm/Config/llvm-config.h.cmake b/llvm/include/llvm/Config/llvm-config.h.cmake
--- a/llvm/include/llvm/Config/llvm-config.h.cmake
+++ b/llvm/include/llvm/Config/llvm-config.h.cmake
@@ -94,4 +94,7 @@
 /* Define to 1 to enable the experimental new pass manager by default */
 #cmakedefine01 LLVM_ENABLE_NEW_PASS_MANAGER
 
+/* Define if the xar_open() function is supported on this platform. */
+#cmakedefine LLVM_HAVE_LIBXAR ${LLVM_HAVE_LIBXAR}
+
 #endif
diff --git a/llvm/test/CMakeLists.txt b/llvm/test/CMakeLists.txt
--- a/llvm/test/CMakeLists.txt
+++ b/llvm/test/CMakeLists.txt
@@ -1,6 +1,6 @@
 llvm_canonicalize_cmake_booleans(
   BUILD_SHARED_LIBS
-  HAVE_LIBXAR
+  LLVM_HAVE_LIBXAR
   HAVE_OCAMLOPT
   HAVE_OCAML_OUNIT
   LLVM_ENABLE_DIA_SDK
diff --git a/llvm/test/lit.site.cfg.py.in b/llvm/test/lit.site.cfg.py.in
--- a/llvm/test/lit.site.cfg.py.in
+++ b/llvm/test/lit.site.cfg.py.in
@@ -36,7 +36,7 @@
 config.llvm_use_intel_jitevents = @LLVM_USE_INTEL_JITEVENTS@
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 config.have_zlib = @LLVM_ENABLE_ZLIB@
-config.have_libxar = @HAVE_LIBXAR@
+config.have_libxar = @LLVM_HAVE_LIBXAR@
 config.have_libxml2 = @LLVM_ENABLE_LIBXML2@
 config.have_dia_sdk = @LLVM_ENABLE_DIA_SDK@
 config.enable_ffi = @LLVM_ENABLE_FFI@
diff --git a/llvm/tools/llvm-objdump/CMakeLists.txt b/llvm/tools/llvm-objdump/CMakeLists.txt
--- a/llvm/tools/llvm-objdump/CMakeLists.txt
+++ b/llvm/tools/llvm-objdump/CMakeLists.txt
@@ -35,7 +35,7 @@
   OtoolOptsTableGen
   )
 
-if(HAVE_LIBXAR)
+if(LLVM_HAVE_LIBXAR)
   target_link_libraries(llvm-objdump PRIVATE ${XAR_LIB})
 endif()
 
diff --git a/llvm/tools/llvm-objdump/MachODump.cpp b/llvm/tools/llvm-objdump/MachODump.cpp
--- a/llvm/tools/llvm-objdump/MachODump.cpp
+++ b/llvm/tools/llvm-objdump/MachODump.cpp
@@ -53,7 +53,7 @@
 #include <cstring>
 #include <system_error>
 
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
 extern "C" {
 #include <xar/xar.h>
 }
@@ -184,7 +184,7 @@
 typedef std::vector<DiceTableEntry> DiceTable;
 typedef DiceTable::iterator dice_table_iterator;
 
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
 namespace {
 struct ScopedXarFile {
   xar_t xar;
@@ -211,7 +211,7 @@
   operator xar_iter_t() { return iter; }
 };
 } // namespace
-#endif // defined(HAVE_LIBXAR)
+#endif // defined(LLVM_HAVE_LIBXAR)
 
 // This is used to search for a data in code table entry for the PC being
 // disassembled.  The j parameter has the PC in j.first.  A single data in code
@@ -1697,12 +1697,12 @@
                              StringRef DisSegName, StringRef DisSectName);
 static void DumpProtocolSection(MachOObjectFile *O, const char *sect,
                                 uint32_t size, uint32_t addr);
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
 static void DumpBitcodeSection(MachOObjectFile *O, const char *sect,
                                 uint32_t size, bool verbose,
                                 bool PrintXarHeader, bool PrintXarFileHeaders,
                                 std::string XarMemberName);
-#endif // defined(HAVE_LIBXAR)
+#endif // defined(LLVM_HAVE_LIBXAR)
 
 static void DumpSectionContents(StringRef Filename, MachOObjectFile *O,
                                 bool verbose) {
@@ -1773,13 +1773,13 @@
             DumpProtocolSection(O, sect, sect_size, sect_addr);
             continue;
           }
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
           if (SegName == "__LLVM" && SectName == "__bundle") {
             DumpBitcodeSection(O, sect, sect_size, verbose, SymbolicOperands,
                                ArchiveHeaders, "");
             continue;
           }
-#endif // defined(HAVE_LIBXAR)
+#endif // defined(LLVM_HAVE_LIBXAR)
           switch (section_type) {
           case MachO::S_REGULAR:
             DumpRawSectionContents(O, sect, sect_size, sect_addr);
@@ -6460,7 +6460,7 @@
   }
 }
 
-#ifdef HAVE_LIBXAR
+#ifdef LLVM_HAVE_LIBXAR
 static inline void swapStruct(struct xar_header &xar) {
   sys::swapByteOrder(xar.magic);
   sys::swapByteOrder(xar.size);
@@ -6823,7 +6823,7 @@
     }
   }
 }
-#endif // defined(HAVE_LIBXAR)
+#endif // defined(LLVM_HAVE_LIBXAR)
 
 static void printObjcMetaData(MachOObjectFile *O, bool verbose) {
   if (O->is64Bit())
diff --git a/llvm/utils/gn/secondary/lld/test/BUILD.gn b/llvm/utils/gn/secondary/lld/test/BUILD.gn
--- a/llvm/utils/gn/secondary/lld/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/lld/test/BUILD.gn
@@ -53,9 +53,9 @@
   }
 
   if (llvm_enable_libxar) {
-    extra_values += [ "HAVE_LIBXAR=1" ]
+    extra_values += [ "LLVM_HAVE_LIBXAR=1" ]
   } else {
-    extra_values += [ "HAVE_LIBXAR=0" ]  # Must be 0.
+    extra_values += [ "LLVM_HAVE_LIBXAR=0" ]  # Must be 0.
   }
 
   if (llvm_enable_libxml2) {
diff --git a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
@@ -296,12 +296,6 @@
     values += [ "HAVE_LIBEDIT=" ]
   }
 
-  if (llvm_enable_libxar) {
-    values += [ "HAVE_LIBXAR=1" ]
-  } else {
-    values += [ "HAVE_LIBXAR=" ]
-  }
-
   if (llvm_enable_terminfo) {
     values += [ "LLVM_ENABLE_TERMINFO=1" ]
   } else {
@@ -368,6 +362,12 @@
     ]
   }
 
+  if (llvm_enable_libxar) {
+    values += [ "LLVM_HAVE_LIBXAR=1" ]
+  } else {
+    values += [ "LLVM_HAVE_LIBXAR=" ]
+  }
+
   if (llvm_enable_threads) {
     values += [ "LLVM_ENABLE_THREADS=1" ]
   } else {
diff --git a/llvm/utils/gn/secondary/llvm/test/BUILD.gn b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
--- a/llvm/utils/gn/secondary/llvm/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
@@ -162,9 +162,9 @@
   }
 
   if (llvm_enable_libxar) {
-    extra_values += [ "HAVE_LIBXAR=1" ]
+    extra_values += [ "LLVM_HAVE_LIBXAR=1" ]
   } else {
-    extra_values += [ "HAVE_LIBXAR=0" ]  # Must be 0.
+    extra_values += [ "LLVM_HAVE_LIBXAR=0" ]  # Must be 0.
   }
 
   if (llvm_enable_dia_sdk) {