Add a new -optimized-tools configure flag (the cmake flag is -DQT_FEATURE_optimized_tools=ON ). The flag makes the Bootstrap library and all qt_internal_add_tool targets to build with '-O3' optimizations when configuring a -debug Qt (also for the debug part of a -debug-and-release Qt). Allow to opt out of this behavior on a per-target or per-project basis by setting -DQT_FORCE_NO_OPTIMIZE_<target>=ON or -DQT_FORCE_NO_OPTIMIZE_<project_name>=ON. For example, to disable optimized flags for the qmlcachegen tool: -DQT_FORCE_NO_OPTIMIZE_qmlcachegen=ON Or for the whole qtdeclarative module: -DQT_FORCE_NO_OPTIMIZE_qtdeclarative=ON This allows building an optimized moc, while still being able to easily debug qtdeclarative tools. Inspired by the unmerged 7b4e9606204de7445e944f832f47fd20bdc2d000 Inspired by the unmerged c9658b2b3c5e3fb93b881f30d031f11001bd597d Change-Id: I9350c03df8a23dadbe3df3df84f2777aa71bd105 Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>