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

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

Differential Revision: https://reviews.llvm.org/D135159

Author: mgorny

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

@@ -36,3 +36,8 @@ def calculate_arch_features(arch_string):
 
 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

@@ -17,5 +17,7 @@
     "@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

@@ -16,3 +16,8 @@
 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

@@ -14,3 +14,8 @@
         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

@@ -17,3 +17,7 @@
     "@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

@@ -14,3 +14,8 @@
         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

@@ -35,3 +35,8 @@
     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

@@ -59,3 +59,8 @@
 # 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"