Merge github.com:grpc/grpc into measure_some_things

tools/jenkins/run_portability.sh

@@ -41,6 +41,14 @@ set -ex -o igncr || set -ex
 
 echo "building $scenario"
 
+# If scenario has _bo suffix, add --build_only flag.
+# Short suffix name had to been chosen due to path length limit on Windows.
+if [ "$scenario" != "${scenario%_bo}" ]
+then
+  scenario="${scenario%_bo}"
+  BUILD_ONLY_MAYBE="--build_only"
+fi
+
 parts=($(echo $scenario | tr '_' ' '))  # split scenario into parts
 
 curr_platform=${parts[0]}  # variable named 'platform' breaks the windows build
@@ -54,4 +62,4 @@ then
   USE_DOCKER_MAYBE="--use_docker"
 fi
 
-python tools/run_tests/run_tests.py $USE_DOCKER_MAYBE -t -l $language -c $config --arch ${curr_arch} --compiler ${curr_compiler} -x report.xml -j 3 $@
+python tools/run_tests/run_tests.py $USE_DOCKER_MAYBE $BUILD_ONLY_MAYBE -t -l $language -c $config --arch ${curr_arch} --compiler ${curr_compiler} -x report.xml -j 3 $@

tools/run_tests/run_tests.py

@@ -1059,13 +1059,15 @@ def _build_and_run(
     check_cancelled, newline_on_success, cache, xml_report=None, build_only=False):
   """Do one pass of building & running tests."""
   # build latest sequentially
-  num_failures, _ = jobset.run(
+  num_failures, resultset = jobset.run(
       build_steps, maxjobs=1, stop_on_failure=True,
       newline_on_success=newline_on_success, travis=args.travis)
   if num_failures:
     return [BuildAndRunError.BUILD]
 
   if build_only:
+    if xml_report:
+      report_utils.render_junit_xml_report(resultset, xml_report)
     return []
 
   # start antagonists