Qt uses the qtNomakeTools() function to mark a directory which will
not be built as part of the default target. This is especially
important when cross-compiling (to iOS for example) because the build
process might fail.
The condition for not building these "GUI tool sub-directory projects"
is the absence of the "tools" value in qmake's QT_BUILD_PARTS
variable.
Introduce a QT_NO_MAKE_TOOLS CMake variable. If the value is true,
it's equivalent to "tools" not being present in QT_BUILD_PARTS.
Introduce qt_exclude_tool_directories_from_default_target().
It's the qmake counter part to qtNomakeTools().
Teach pro2cmake to generate it where appropriate.
Change-Id: If2e5958d91847ab139af0e452608510286e73fa0
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
622894f96e