Index: lld/test/MachO/lit.local.cfg
===================================================================
--- lld/test/MachO/lit.local.cfg
+++ lld/test/MachO/lit.local.cfg
@@ -2,6 +2,12 @@
 
 import os
 
+# FIXME: The MachO back-end currently does not respect endianness when
+# accessing binary data structures, and therefore only works correctly
+# on little-endian host systems.  Skip all tests on big-endian hosts.
+if 's390x' in config.host_triple:
+    config.unsupported = True
+
 # We specify the most commonly-used archs and platform versions in our tests
 # here. Tests which need different settings can just append to this, as only
 # the last value will be used.
Index: lld/test/lit.site.cfg.py.in
===================================================================
--- lld/test/lit.site.cfg.py.in
+++ lld/test/lit.site.cfg.py.in
@@ -15,6 +15,7 @@
 config.lld_obj_root = "@LLD_BINARY_DIR@"
 config.lld_libs_dir = lit_config.substitute("@CURRENT_LIBS_DIR@")
 config.lld_tools_dir = lit_config.substitute("@CURRENT_TOOLS_DIR@")
+config.host_triple = "@LLVM_HOST_TRIPLE@"
 config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.python_executable = "@Python3_EXECUTABLE@"
 config.have_zlib = @LLVM_ENABLE_ZLIB@