[clang-tools-extra] [test] Use CLANG_NO_DEFAULT_CONFIG=1

[mgorny]

Summary

Set CLANG_NO_DEFAULT_CONFIG=1 for clang-tools-extra tests to prevent
the system configuration files for clang from affecting the test
results.

clang-tools-extra/clangd/test/lit.cfg.py

 if config.clangd_enable_remote:
   config.available_features.add('clangd-remote-index')
 
 if config.clangd_tidy_checks:
   config.available_features.add('clangd-tidy-checks')
 
 if config.have_zlib:
   config.available_features.add('zlib')
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/clangd/unittests/lit.cfg.py

 elif platform.system() == 'Windows':
     shlibpath_var = 'PATH'
 else:
     shlibpath_var = 'LD_LIBRARY_PATH'
 config.environment[shlibpath_var] = os.path.pathsep.join((
     "@SHLIBDIR@", "@LLVM_LIBS_DIR@",
     config.environment.get(shlibpath_var,'')))
 
-
-
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/include-cleaner/test/Unit/lit.cfg.py

if platform.system() == 'Darwin':
     shlibpath_var = 'DYLD_LIBRARY_PATH'
 elif platform.system() == 'Windows':
     shlibpath_var = 'PATH'
 else:
     shlibpath_var = 'LD_LIBRARY_PATH'
 config.environment[shlibpath_var] = os.path.pathsep.join((
     "@SHLIBDIR@", "@LLVM_LIBS_DIR@",
     config.environment.get(shlibpath_var,'')))
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/include-cleaner/test/lit.cfg.py

 import lit.llvm
 
 lit.llvm.initialize(lit_config, config)
 lit.llvm.llvm_config.use_default_substitutions()
 
 config.name = 'ClangIncludeCleaner'
 config.suffixes = ['.test', '.c', '.cpp']
 config.excludes = ['Inputs']
 config.test_format = lit.formats.ShTest(not lit.llvm.llvm_config.use_lit_shell)
 config.test_source_root = config.clang_include_cleaner_source_dir + "/test"
 config.test_exec_root = config.clang_include_cleaner_binary_dir + "/test"
 
 config.environment['PATH'] = os.path.pathsep.join((
         config.clang_tools_dir,
         config.llvm_tools_dir,
         config.environment['PATH']))
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/pseudo/test/Unit/lit.cfg.py

 elif platform.system() == 'Windows':
     shlibpath_var = 'PATH'
 else:
     shlibpath_var = 'LD_LIBRARY_PATH'
 config.environment[shlibpath_var] = os.path.pathsep.join((
     "@SHLIBDIR@", "@LLVM_LIBS_DIR@",
     config.environment.get(shlibpath_var,'')))
 
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/pseudo/test/lit.cfg.py

 import lit.llvm
 
 lit.llvm.initialize(lit_config, config)
 lit.llvm.llvm_config.use_default_substitutions()
 
 config.name = 'ClangPseudo'
 config.suffixes = ['.test', '.c', '.cpp']
 config.excludes = ['Inputs']
 config.test_format = lit.formats.ShTest(not lit.llvm.llvm_config.use_lit_shell)
 config.test_source_root = config.clang_pseudo_source_dir + "/test"
 config.test_exec_root = config.clang_pseudo_binary_dir + "/test"
 
 config.environment['PATH'] = os.path.pathsep.join((
         config.clang_tools_dir,
         config.llvm_tools_dir,
         config.environment['PATH']))
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/test/Unit/lit.cfg.py

 shlibpath = os.path.pathsep.join((config.shlibdir, config.llvm_libs_dir,
                                  config.environment.get(shlibpath_var,'')))
 
 # Win32 seeks DLLs along %PATH%.
 if sys.platform in ['win32', 'cygwin'] and os.path.isdir(config.shlibdir):
     shlibpath = os.path.pathsep.join((config.shlibdir, shlibpath))
 
 config.environment[shlibpath_var] = shlibpath
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

clang-tools-extra/test/lit.cfg.py

 clang_tidy_headers = os.path.join(
     config.test_source_root, "clang-tidy", "checkers", "Inputs", "Headers")
 config.substitutions.append(
     ("%clang_tidy_headers", clang_tidy_headers) )
 
 # Plugins (loadable modules)
 if config.has_plugins and config.llvm_plugin_ext:
     config.available_features.add('plugins')
+
+# It is not realistically possible to account for all options that could
+# possibly be present in system and user configuration files, so disable
+# default configs for the test runs.
+config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"