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  1. Qt
  2. QTBUG-93045

The build system should provide a moc_predefs.h with a matching __cplusplus

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      As mentioned in the linked bugs, moc will run into issues parsing headers if __cplusplus has the wrong value. Working around those bugs in moc might be possible, but ends up becoming a whack-a-mole game, and might lead to strange bugs if the compilation doesn't actually fail but we read a wrong value instead.

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          relates to

          Task - A task that needs to be done. QTBUG-110847 Teach CMake AUTOMOC to use a target's CXX language version for the generation of moc predefines file

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83160 moc stumbles on _GLIBCXX_VISIBILITY

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-73263 Qmake fails to generate moc file when using std::filesystem library

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Open
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              qtbuildsystem Qt Build System Team
              fabiankosmale Fabian Kosmale
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