Index: lld/test/ELF/lit.local.cfg
===================================================================
--- lld/test/ELF/lit.local.cfg
+++ lld/test/ELF/lit.local.cfg
@@ -1 +1,8 @@
 config.suffixes = ['.test', '.s', '.ll', '.bat']
+
+# The environment variable DFLTCC=0 disables use of the hardware compression
+# facility on SystemZ.  When this facility is enabled, slightly different
+# compression results can be seen, which can cause spurious failures in the
+# compressed-debug-level.test test case.
+if 's390x' in config.host_triple:
+    config.environment['DFLTCC'] = '0'
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@