run-tests: fix exename on Windows [ original upstream message ]

run-tests: support running tests in parallel on windows Previously, we used os.spawnvp, which doesn't exist on Windows, and isn't needed anyway (the command line begins with an absolute path). We also need a slightly more convoluted way to wait for processes without specifying an order on Windows, as it lacks os.wait. [ original upstream message ]

run-tests: use correct python safely under --jobs [ original upstream message ]

run-tests: check for the correct python when starting [ original upstream message ]

run-tests: use correct python when run with --local [ original upstream message ]

Merge with stable

run-tests: fix an unnoticed check-code violation [ original upstream message ]

run-tests: add a --compiler option Without this option, it is not possible to run the test suite on Windows using mingw's gcc as the compiler. [ original upstream message ]

run-tests: make build command line less intimidating Use a dict for parameters to the format string, instead of a ridiculous number of positional parameters. [ original upstream message ]

run-tests: backout 4a4173519b63 This deleted work in progress to eliminate child processes for -j. [ original upstream message ]

Merge with stable

run-tests.py: remove runqueue's results parameter since it is now a global [ original upstream message ]

run-tests: open child-parent pipes in binary mode Python's pickle is a binary format. [ original upstream message ]

run-tests: add --time option to log times for each test --time also prints out the wall-clock time each test takes in descending order. [ original upstream message ]

run-tests: remove resultslock since it serves no useful purpose Each child process has its own copy of the results dict, so all access to the results dict is serial. [ original upstream message ]