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  1. Qt
  2. QTBUG-83160

moc stumbles on _GLIBCXX_VISIBILITY

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: 5.12.7
    • Fix Version/s: None
    • Component/s: Build tools: moc
    • Labels:
      None

      Description

      There is at least one distribution that add GCC's C++ headers on CPLUS_INCLUDE_PATH.

      When 'moc' encounters the _GLIBCXX_VISIBILITY macro, it trips and fails with a "Parse error before <token>" where token is the word just before _GLIBCXX_VISIBILITY.

      An easy fix for this problem is:

      diff --git a/src/tools/moc/main.cpp b/src/tools/moc/main.cpp
--- a/src/tools/moc/main.cpp
+++ b/src/tools/moc/main.cpp
@@ -188,6 +188,7 @@ int runMoc(int argc, char **argv)
     dummyVariadicFunctionMacro.arguments += Symbol(0, PP_IDENTIFIER, "__VA_ARGS__");
     pp.macros["__attribute__"] = dummyVariadicFunctionMacro;
     pp.macros["__declspec"] = dummyVariadicFunctionMacro;
+    pp.macros["_GLIBCXX_VISIBILITY"] = dummyVariadicFunctionMacro;
 
     QString filename;
     QString output

      GLIBCXX_VISIBILITY is a preprocessor macro that expands to _attribute_ which is already ignored by moc.

      Should I send this patch through Gerrit?

        Attachments

          Issue Links

          relates to

          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

          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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            Activity

              People

              Assignee:
              fabiankosmale Fabian Kosmale
              Reporter:
              mbakke Marius Bakke
              Votes:
              2 Vote for this issue
              Watchers:
              4 Start watching this issue

                Dates

                Created:
                Updated:

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