[dotest] Use subprocess.call to forward arguments in wrapper

As suggested by Pavel on lldb-commits. Originally I picked os.system
because it was so much more simple than the subprocess module, but that
no longer holds true after yesterday's hack in r328020. This is what it
should've been in the first place.

Differential revision: https://reviews.llvm.org/D44728

llvm-svn: 328089

lldb/test/CMakeLists.txt

@@ -136,8 +136,7 @@ add_python_test_target(check-lldb
   )
 
 # Generate a wrapper for dotest.py in the bin directory.
-string (REPLACE ";" " " LLDB_DOTEST_ARGS_STR  "${LLDB_DOTEST_ARGS}")
-# We need this to substitute variables.
+# We need configure_file to substitute variables.
 configure_file(
   lldb-dotest.in
   ${CMAKE_CURRENT_BINARY_DIR}/lldb-dotest.configured

lldb/test/lldb-dotest.in

@@ -1,18 +1,16 @@
 #!/usr/bin/env python
+import subprocess
 import sys
-import os
 
 dotest_path = '@LLDB_SOURCE_DIR@/test/dotest.py'
-dotest_args = '@LLDB_DOTEST_ARGS_STR@'
+dotest_args_str = '@LLDB_DOTEST_ARGS@'
 
 if __name__ == '__main__':
-    # Wrap arguments in single quotes. This is necessary because we want to
-    # forward the arguments and otherwise we might split up arguments that were
-    # originally wrapped in single quotes.
-    wrapper_args = list("'" + i + "'" for i in sys.argv[1:])
-    # FIXME: It would be nice if we can mimic the approach taken by llvm-lit
-    # and pass a python configuration straight to dotest, rather than going
-    # through the operating system.
-    command = '{} -q {} {}'.format(dotest_path, dotest_args,
-                                   ' '.join(wrapper_args))
-    os.system(command)
+    wrapper_args = sys.argv[1:]
+    dotest_args = dotest_args_str.split(';')
+    # Build dotest.py command.
+    cmd = [dotest_path, '-q']
+    cmd.extend(dotest_args)
+    cmd.extend(wrapper_args)
+    # Invoke dotest.py
+    subprocess.call(cmd)