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  1. Qt
  2. QTBUG-73263

Qmake fails to generate moc file when using std::filesystem library

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Details

    • Bug
    • Resolution: Unresolved
    • P1: Critical
    • None
    • 5.12.0
    • Build tools: moc
    • None
    • Linux/X11

    Description

      When using #include <filesystem> before certain other header files, qmake produces the error:

      Parse error at "std"
      File not found: usr/include/c++/8.2.1/bits/fs_fwd.

      In the attached example, moving either of the other includes in window.hpp above <filesystem> will prevent the error. I've had this issue a few times, and it seems to always be in a header associated with a .ui file.

      Attachments

        1. fs_error.png
          fs_error.png
          13 kB
        2. fs_error.tar.gz
          1 kB
        3. repro_error.tar.gz
          4 kB

        Issue Links

          relates to

          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

          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
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-93045 The build system should provide a moc_predefs.h with a matching __cplusplus

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
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              fabiankosmale Fabian Kosmale
              tguen tguen
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              Dates

                Created:
                Updated:

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