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This defines a 'UseLaunchers' CTest configuration option. When enabled, CTest skips log scraping from the Build step output. Instead it defines the environment variable CTEST_LAUNCH_LOGS to a log directory during the build. After the build it looks for error-*.xml and warning-*.xml files containing fragments for inclusion in Build.xml and submission. This is useful in conjuction with 'ctest --launch' and the RULE_LAUNCH_* properties to get reliable, highly-granular build failure reports.