Details
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Bug
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Resolution: Fixed
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P3: Somewhat important
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6.1.0, 6.1.1, 6.1.2, 6.2.0 FF, 6.2.0 Alpha, 6.2.0 Beta1, 6.2.0 Beta2
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None
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Conan package manager.
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Linux/X11
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f7b7262f1 (dev), 2c0e78e7b (6.6), 4b227477f (6.5)
Description
Qt helper function 'qt_generate_qmake_libraries_pri_content' in 'qtbase/cmake/QtPriHelpers.cmake' iterates over targets that Qt links against. For each target it also obtains 'INTERFACE_LINK_LIBRARIES' and adds them to the list of targets to process.
In Conan the 'Vulkan::Vulkan' target 'INTERFACE_LINK_LIBRARIES' property contains 'Vulkan::Vulkan'. This leads to an infinite loop where 'Vulkan::Vulkan' is popped from 'lib_targets' list on line 27 and 'Vulkan::Vulkan' gets prepended back to 'lib_targets' on line 33.
Partially this is a problem with Conan which produces the 'FindVulkan.cmake' file with dubious 'INTERFACE_LINK_LIBRARIES' property value. On the other hand Qt should in my opinion at the very least detect this case and throw an error. This situation can arise on other platforms/dependencies as well and is somewhat difficult to diagnose.
A simple patch for avoiding duplicate targets in 'lib_targets' is attached. Please note that more complicated circular dependencies between multiple targets can still lead to an infinite loop.
For reference: Conan issue #6076