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

[JDevlieghere]

Summary

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.

[JDevlieghere]

Re-add accidentally removed comment.

[labath]

Thank you. This looks good, assuming that the LLDB_DOTEST_ARGS_STR thingy is working as intended.

test/lldb-dotest.in

6 ↗

(On Diff #139270)

I'm confused. Shouldn't this be @LLDB_DOTEST_ARGS@, now that you've removed the _STR version?

[JDevlieghere]

In D44728#1044255, @labath wrote:

Thank you. This looks good, assuming that the LLDB_DOTEST_ARGS_STR thingy is working as intended.

Good catch, the variable was still available from the cache. I'll commit this with the fix.

lldb/trunk/test/CMakeLists.txt

 # output is desired (i.e. in continuous integration contexts) check-lldb-single is a better target.
 add_python_test_target(check-lldb
   ${LLDB_SOURCE_DIR}/test/dotest.py
   "-q;${LLDB_DOTEST_ARGS}"
   "Testing LLDB (parallel execution, with a separate subprocess per test)"
   )
 
 # 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
   )
 # We need this to expand the generator expressions.
 file(GENERATE
   OUTPUT
   $<TARGET_FILE_DIR:lldb>/lldb-dotest

lldb/trunk/test/lldb-dotest.in

 #!/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)