Our C() macro conflicts with Qt6 usage, so #undef C has added. Move
that from nearly every qt_*.cpp into qt_pre.h where other similar
fixups are handled.
Move the nine #undef's common to all qt_*.cpp sources into qt_pre.h.
Make "hack.h" usage consistent; always enclose withing 'extern "C {'
and '}' even though only some of the sources care.
In file included from ../win/Qt/qt_bind.cpp:20:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGui:3:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGuiDepends:3:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtCore.framework/Headers/QtCore:4:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtCore.framework/Headers/qglobal.h:1302:
/usr/local/Cellar/qt/5.15.0/lib/QtCore.framework/Headers/qflags.h:121:41: warning: declaration shadows a
variable in the global namespace [-Wshadow]
Q_DECL_CONSTEXPR inline QFlags(Enum flags) noexcept : i(Int(flags)) {}
^
[…]
../include/flag.h:390:29: note: previous declaration is here
extern NEARDATA struct flag flags;
^
In file included from ../win/Qt/qt_click.cpp:18:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGui:3:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGuiDepends:3:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtCore.framework/Headers/QtCore:36:
/usr/local/Cellar/qt/5.15.0/lib/QtCore.framework/Headers/qcache.h:191:15: warning: declaration shadows a
variable in the global namespace [-Wshadow]
Node *u = n;
^
../include/decl.h:219:23: note: previous declaration is here
E NEARDATA struct you u;
^
[…]
In file included from ../win/Qt/qt_click.cpp:18:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGui:5:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qabstracttextdocumentlayout.h:45:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qtextlayout.h:47:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qcolor.h:44:
/usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qrgb.h:66:46: warning: declaration shadows a
variable in the global namespace [-Wshadow]
inline Q_DECL_CONSTEXPR QRgb qRgb(int r, int g, int b)// set RGB value
^
../include/decl.h:1208:27: note: previous declaration is here
E struct instance_globals g;
^
[…]
In file included from ../win/Qt/qt_glyph.cpp:21:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/QtGui:5:
In file included from /usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qabstracttextdocumentlayout.h:48:
/usr/local/Cellar/qt/5.15.0/lib/QtGui.framework/Headers/qpalette.h:107:49: warning: declaration shadows a
variable in the global namespace [-Wshadow]
inline void setCurrentColorGroup(ColorGroup cg) { data.current_group = cg; }
^
../include/decl.h:1216:30: note: previous declaration is here
E const struct const_globals cg;
^
