diff --git a/libcxx/test/configs/apple-libc++-shared.cfg.in b/libcxx/test/configs/apple-libc++-shared.cfg.in
--- a/libcxx/test/configs/apple-libc++-shared.cfg.in
+++ b/libcxx/test/configs/apple-libc++-shared.cfg.in
@@ -7,8 +7,6 @@
 # We also don't use a per-target include directory layout, so we have only one
 # include directory for the libc++ headers.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}',
@@ -21,7 +19,7 @@
     '-nostdlib++ -L %{install}/lib -lc++'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T --env DYLD_LIBRARY_PATH=%{{install}}/lib -- '.format(sys.executable)
+    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH=%{install}/lib -- '
 ))
 
 import os, site
diff --git a/libcxx/test/configs/cmake-bridge.cfg.in b/libcxx/test/configs/cmake-bridge.cfg.in
--- a/libcxx/test/configs/cmake-bridge.cfg.in
+++ b/libcxx/test/configs/cmake-bridge.cfg.in
@@ -29,3 +29,4 @@
 config.substitutions.append(('%{include}', '%{install}/@LIBCXX_INSTALL_INCLUDE_DIR@'))
 config.substitutions.append(('%{target-include}', '%{install}/@LIBCXX_INSTALL_INCLUDE_TARGET_DIR@'))
 config.substitutions.append(('%{lib}', '%{install}/@LIBCXX_INSTALL_LIBRARY_DIR@'))
+config.substitutions.append(('%{executor}', '@LIBCXX_EXECUTOR@'))
diff --git a/libcxx/test/configs/ibm-libc++-shared.cfg.in b/libcxx/test/configs/ibm-libc++-shared.cfg.in
--- a/libcxx/test/configs/ibm-libc++-shared.cfg.in
+++ b/libcxx/test/configs/ibm-libc++-shared.cfg.in
@@ -2,8 +2,6 @@
 # AIX using a shared library.
 #
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}', ''))
@@ -14,7 +12,7 @@
     '-nostdlib++ -L %{install}/lib -lc++ -lc++abi -latomic -Wl,-bbigtoc'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T --env LIBPATH=%{{install}}/lib -- '.format(sys.executable)
+    '%{executor} --execdir %T --env LIBPATH=%{install}/lib -- '
 ))
 
 # LIBCXX-AIX-FIXME is the feature name used to XFAIL the
diff --git a/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in b/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
--- a/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
+++ b/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
@@ -2,8 +2,6 @@
 # using a shared library, with GCC. This is done differently from Clang because
 # GCC does not support the -nostdlib++ command-line flag.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}', ''))
@@ -14,7 +12,7 @@
     '-L %{lib} -Wl,-rpath,%{lib} -nodefaultlibs -lc++ -lm -lgcc_s -lgcc -lpthread -lc -lgcc_s -lgcc -latomic'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T -- '.format(sys.executable)
+    '%{executor} --execdir %T -- '
 ))
 
 import os, site
diff --git a/libcxx/test/configs/llvm-libc++-shared.cfg.in b/libcxx/test/configs/llvm-libc++-shared.cfg.in
--- a/libcxx/test/configs/llvm-libc++-shared.cfg.in
+++ b/libcxx/test/configs/llvm-libc++-shared.cfg.in
@@ -1,8 +1,6 @@
 # This testing configuration handles running the test suite against LLVM's libc++
 # using a shared library.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}',
@@ -15,7 +13,7 @@
     '-nostdlib++ -L %{lib} -Wl,-rpath,%{lib} -lc++ -pthread'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T -- '.format(sys.executable)
+    '%{executor} --execdir %T -- '
 ))
 
 import os, site
diff --git a/libcxx/test/configs/llvm-libc++-static.cfg.in b/libcxx/test/configs/llvm-libc++-static.cfg.in
--- a/libcxx/test/configs/llvm-libc++-static.cfg.in
+++ b/libcxx/test/configs/llvm-libc++-static.cfg.in
@@ -1,8 +1,6 @@
 # This testing configuration handles running the test suite against LLVM's libc++
 # using a static library.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}',
@@ -15,7 +13,7 @@
     '-nostdlib++ -L %{lib} -lc++ -lc++abi -pthread'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T -- '.format(sys.executable)
+    '%{executor} --execdir %T -- '
 ))
 
 import os, site
diff --git a/libcxxabi/test/configs/apple-libc++abi-shared.cfg.in b/libcxxabi/test/configs/apple-libc++abi-shared.cfg.in
--- a/libcxxabi/test/configs/apple-libc++abi-shared.cfg.in
+++ b/libcxxabi/test/configs/apple-libc++abi-shared.cfg.in
@@ -1,7 +1,5 @@
 # Testing configuration for Apple's system libc++abi.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}',
@@ -15,7 +13,7 @@
     '-nostdlib++ -L %{install}/lib -lc++ -lc++abi'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T --env DYLD_LIBRARY_PATH=%{{install}}/lib -- '.format(sys.executable)
+    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH=%{install}/lib -- '
 ))
 
 import os, site
diff --git a/libcxxabi/test/configs/cmake-bridge.cfg.in b/libcxxabi/test/configs/cmake-bridge.cfg.in
--- a/libcxxabi/test/configs/cmake-bridge.cfg.in
+++ b/libcxxabi/test/configs/cmake-bridge.cfg.in
@@ -29,3 +29,4 @@
 config.substitutions.append(('%{cxx}', '@CMAKE_CXX_COMPILER@'))
 config.substitutions.append(('%{libcxx}', '@LIBCXXABI_LIBCXX_PATH@'))
 config.substitutions.append(('%{install}', '@CMAKE_BINARY_DIR@'))
+config.substitutions.append(('%{executor}', '@LIBCXXABI_EXECUTOR@'))
diff --git a/libcxxabi/test/configs/ibm-libc++abi-shared.cfg.in b/libcxxabi/test/configs/ibm-libc++abi-shared.cfg.in
--- a/libcxxabi/test/configs/ibm-libc++abi-shared.cfg.in
+++ b/libcxxabi/test/configs/ibm-libc++abi-shared.cfg.in
@@ -1,7 +1,5 @@
 # Testing configuration for libc++abi on AIX.
 
-import sys
-
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
 config.substitutions.append(('%{flags}',''))
@@ -15,7 +13,7 @@
     '-nostdlib++ -L %{install}/lib -lc++ -lc++abi -Wl,-bbigtoc'
 ))
 config.substitutions.append(('%{exec}',
-    '{} %{{libcxx}}/utils/run.py --execdir %T --env LIBPATH=%{{install}}/lib -- '.format(sys.executable)
+    '%{executor} --execdir %T --env LIBPATH=%{install}/lib -- '
 ))
 
 import os, site