[Build System] Remove the use of sub-shells when running test targets #20025
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Removes the use of sub-shells when running the test targets in
build-script-impl
. We were generating a "dry-run" test command using Ninja's-n
option and then executing it via/usr/env bash
to avoid Ninja's output buffering when running lit in non-verbose mode. However, local testing shows the output test bar does not seem affected any longer.As a result of this change we also needed to update the
--test-paths
option to pass the test paths through to CMake rather than appending them onto the test command. That worked before because the generated test command ended with the lit.py invocation (which seems very flimsy).rdar://43165161
rdar://33714951