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  1. Qt
  2. QTBUG-56193

FTBFS on macOS: moc does not get all the paths it needs

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    • Platform/s:
      macOS

      Description

      When building the 5.8 beta sources (and current 5.8 branch), the build fails because Q_OS_MAC isn't defined while moc parses source code. That is caused by moc not receiving all the paths it needs from qmake.

      The error is:

      Undefined symbols for architecture x86_64:
        "QMacStyle::staticMetaObject", referenced from:
            showToolTip(QHelpEvent*, QWidget*, QStyleOptionComplex const&, QStyle::ComplexControl, QStyle::SubControl) in qmdisubwindow.o
            QMdiSubWindowPrivate::updateCursor() in qmdisubwindow.o
            QMdiSubWindowPrivate::getRegion(QMdiSubWindowPrivate::Operation) const in qmdisubwindow.o
            QMdiSubWindowPrivate::processClickedSubControl() in qmdisubwindow.o
            QMdiSubWindowPrivate::setSizeGrip(QSizeGrip*) in qmdisubwindow.o
            QMdiSubWindow::event(QEvent*) in qmdisubwindow.o
            QMdiSubWindow::showEvent(QShowEvent*) in qmdisubwindow.o
            ...
        "vtable for QMacStyle", referenced from:
            QMacStyle::QMacStyle() in qmacstyle_mac.o
            QMacStyle::~QMacStyle() in qmacstyle_mac.o
        NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
      ld: symbol(s) not found for architecture x86_64
      clang: error: linker command failed with exit code 1 (use -v to see invocation)
      make[3]: *** [../../lib/QtWidgets.framework/QtWidgets] Error 1
      make[2]: *** [release-all] Error 2
      make[1]: *** [sub-widgets-make_first] Error 2
      make: *** [sub-src-make_first] Error 2
      

      With an earlier warning from moc:

      /private/tmp/qtbase-opensource-src-5.8.0-beta/bin/moc -DQT_NO_USING_NAMESPACE -DQT_NO_STYLE_WINDOWSVISTA -DQT_NO_STYLE_WINDOWSXP -DQT_NO_STYLE_ANDROID -DQT_BUILD_WIDGETS_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_GUI_LIB -DQT_CORE_LIB --include .moc/debug/moc_predefs.h -I/private/tmp/qtbase-opensource-src-5.8.0-beta/mkspecs/macx-clang -I/private/tmp/qtbase-opensource-src-5.8.0-beta/src/widgets -I/private/tmp/qtbase-opensource-src-5.8.0-beta/src/widgets/dialogs -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtWidgets -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtWidgets/5.8.0 -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtWidgets/5.8.0/QtWidgets -I/private/tmp/qtbase-opensource-src-5.8.0-beta/src/widgets/.uic -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtGui/5.8.0 -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtGui/5.8.0/QtGui -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtCore/5.8.0 -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtCore/5.8.0/QtCore -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtGui -I/private/tmp/qtbase-opensource-src-5.8.0-beta/include/QtCore -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1 -I/usr/local/include -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/include -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include -F/private/tmp/qtbase-opensource-src-5.8.0-beta/lib styles/qmacstyle_mac_p.h -o .moc/debug/moc_qmacstyle_mac_p.cpp
      styles/qmacstyle_mac_p.h:0: Note: No relevant classes found. No output generated.
      

      The class in question (QMacStyle) is defined as:

      qmacstyle_p.h
      #if defined(Q_OS_MAC) && !defined(QT_NO_STYLE_MAC)
      
      class QPalette;
      
      class QPushButton;
      class QStyleOptionButton;
      class QMacStylePrivate;
      class QMacStyle : public QCommonStyle
      {
          Q_OBJECT
      

      In turn, Q_OS_MAC is defined as:

      qsystemdetection.h
      #if defined(__APPLE__) && (defined(__GNUC__) || defined(__xlC__) || defined(__xlc__))
      #  include <TargetConditionals.h>
      #  if defined(TARGET_OS_MAC) && TARGET_OS_MAC
      #    define Q_OS_DARWIN
      

      And the file TargetConditionals.h is found at:

      $ locate TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVSimulator.platform/Developer/SDKs/AppleTVSimulator.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/AppleTVOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/AppleTVSimulator.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/MacOSX.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/WatchOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/WatchSimulator.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/iPhoneOS.sdk/usr/include/TargetConditionals.h
      /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-migrator/sdks/iPhoneSimulator.sdk/usr/include/TargetConditionals.h
      

      As can be seen, none of the paths where this file can be found were passed to moc by qmake. That means moc could not find TargetConditionals.h, which means TARGET_OS_MAC was not defined, which means Q_OS_DARWIN was not defined, which means Q_OS_MAC was not defined, which means the class QMacStyle was #ifdef'ed out, which means the output file was blank and no meta object was generated.

      $ cat .qmake.stash 
      QMAKE_DEFAULT_INCDIRS = \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1 \
          /usr/local/include \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/include \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
      QMAKE_DEFAULT_LIBDIRS = \
          /lib \
          /usr/lib
      QMAKE_XCODE_DEVELOPER_PATH = /Applications/Xcode.app/Contents/Developer
      QMAKE_XCODE_VERSION = 8.0
      QMAKE_MAC_SDK.macosx.Path = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk
      QMAKE_MAC_SDK.macosx.PlatformPath = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
      QMAKE_MAC_SDK.macosx.SDKVersion = 10.12
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_CC = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_CXX = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_FIX_RPATH = \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool \
          -id
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_AR = \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar \
          cq
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_RANLIB = \
          /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib \
          -s
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_LINK = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
      QMAKE_MAC_SDK.macx-clang.macosx.QMAKE_LINK_SHLIB = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
      

      The path wasn't found by qmake. That was found via:

      mkspecs/features/default_post.prf
              output = $$system("$$cmd_prefix $$QMAKE_CXX $$QMAKE_CXXFLAGS -xc++ -E -v - 2>&1 $$cmd_suffix", lines)
      

      Which is incorrect, since that doesn't run the compiler that the build actually uses. It needs to run the correct compiler (which is found by sdk.prf).

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              Assignee:
              buddenha Oswald Buddenhagen
              Reporter:
              thiago Thiago Macieira
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                Created:
                Updated:
                Resolved:

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