Add patch to fix longstanding bug in gcc that was fixed in gcc 9.

qt-everywhere-opensource-src-4.8.7-qforeach.patch

@@ -0,0 +1,40 @@
+--- a/src/corelib/global/qglobal.h
++++ b/src/corelib/global/qglobal.h
+@@ -2482,22 +2482,32 @@ typedef uint Flags;
+ 
+ #endif /* Q_NO_TYPESAFE_FLAGS */
+ 
+-#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && !defined(Q_CC_RVCT)
++#if (defined(Q_CC_GNU) && !defined(Q_CC_RVCT))
+ /* make use of typeof-extension */
+ template <typename T>
+ class QForeachContainer {
+ public:
+-    inline QForeachContainer(const T& t) : c(t), brk(0), i(c.begin()), e(c.end()) { }
++    inline QForeachContainer(const T& t) : c(t), i(c.begin()), e(c.end()), control(1) { }
+     const T c;
+     int brk;
+     typename T::const_iterator i, e;
++    int control;
+ };
+ 
++// Explanation of the control word:
++//  - it's initialized to 1
++//  - that means both the inner and outer loops start
++//  - if there were no breaks, at the end of the inner loop, it's set to 0, which
++//    causes it to exit (the inner loop is run exactly once)
++//  - at the end of the outer loop, it's inverted, so it becomes 1 again, allowing
++//    the outer loop to continue executing
++//  - if there was a break inside the inner loop, it will exit with control still
++//    set to 1; in that case, the outer loop will invert it to 0 and will exit too
+ #define Q_FOREACH(variable, container)                                \
+ for (QForeachContainer<__typeof__(container)> _container_(container); \
+-     !_container_.brk && _container_.i != _container_.e;              \
+-     __extension__  ({ ++_container_.brk; ++_container_.i; }))                       \
+-    for (variable = *_container_.i;; __extension__ ({--_container_.brk; break;}))
++     _container_.control && _container_.i != _container_.e;         \
++     ++_container_.i, _container_.control ^= 1)                     \
++    for (variable = *_container_.i; _container_.control; _container_.control = 0)
+ 
+ #else
+ 

qt.spec

@@ -215,6 +215,10 @@ Patch113: qt-everywhere-opensource-src-4.8.6-QTBUG-22829.patch
 # aarch64 support, https://bugreports.qt-project.org/browse/QTBUG-35442
 Patch180: qt-aarch64.patch
 
+# Fix problem caused by gcc 9 fixing a longstanding bug.
+# https://github.com/qt/qtbase/commit/c35a3f519007af44c3b364b9af86f6a336f6411b.patch
+Patch181: qt-everywhere-opensource-src-4.8.7-qforeach.patch
+
 ## upstream git
 
 ## security patches
@@ -638,6 +642,7 @@ rm -rf src/3rdparty/clucene
 %patch113 -p1 -b .QTBUG-22829
 
 %patch180 -p1 -b .aarch64
+%patch181 -p1 -b .qforeach
 
 # upstream git