Avoid diagnostics for gcc-11 false positive out of bounds accesses

gtk4-gcc11.patch

@@ -11,3 +11,75 @@ index 063b8d0..cb4c9ac 100644
  
    if (g_once_init_enter (&g_define_type_id__volatile))
      {
+diff --git a/gtk/gtktextchild.c b/gtk/gtktextchild.c
+index 4d5e30e..915b991 100644
+--- a/gtk/gtktextchild.c
++++ b/gtk/gtktextchild.c
+@@ -169,6 +169,12 @@ const GtkTextLineSegmentClass gtk_text_paintable_type = {
+ GtkTextLineSegment *
+ _gtk_paintable_segment_new (GdkPaintable *paintable)
+ {
++  /* gcc-11 issues a diagnostic here because the size allocated
++     for SEG does not cover the entire size of a GtkTextLineSegment
++     and gcc has no way to know that the union will only be used
++     for limited types and the additional space is not needed.  */
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Warray-bounds"
+   GtkTextLineSegment *seg;
+   guint flags;
+ 
+@@ -204,6 +210,7 @@ _gtk_paintable_segment_new (GdkPaintable *paintable)
+   g_object_ref (paintable);
+ 
+   return seg;
++#pragma GCC diagnostic pop
+ }
+ 
+ 
+@@ -280,6 +287,12 @@ const GtkTextLineSegmentClass gtk_text_child_type = {
+ GtkTextLineSegment *
+ _gtk_widget_segment_new (GtkTextChildAnchor *anchor)
+ {
++  /* gcc-11 issues a diagnostic here because the size allocated
++     for SEG does not cover the entire size of a GtkTextLineSegment
++     and gcc has no way to know that the union will only be used
++     for limited types and the additional space is not needed.  */
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Warray-bounds"
+   GtkTextLineSegment *seg;
+ 
+   seg = g_slice_alloc (WIDGET_SEG_SIZE);
+@@ -303,6 +316,7 @@ _gtk_widget_segment_new (GtkTextChildAnchor *anchor)
+   g_object_ref (anchor);
+   
+   return seg;
++#pragma GCC diagnostic pop
+ }
+ 
+ void
+diff --git a/gtk/gtktextsegment.c b/gtk/gtktextsegment.c
+index a202ab6..aaac291 100644
+--- a/gtk/gtktextsegment.c
++++ b/gtk/gtktextsegment.c
+@@ -425,6 +425,13 @@ char_segment_check_func (GtkTextLineSegment *segPtr, GtkTextLine *line)
+ GtkTextLineSegment*
+ _gtk_toggle_segment_new (GtkTextTagInfo *info, gboolean on)
+ {
++  /* gcc-11 issues a diagnostic here because the size allocated
++     for SEG does not cover the entire size of a GtkTextLineSegment
++     and gcc has no way to know that the union will only be used
++     for limited types and the additional space is not needed.  */
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Warray-bounds"
++
+   GtkTextLineSegment *seg;
+ 
+   seg = g_slice_alloc (TSEG_SIZE);
+@@ -440,6 +447,7 @@ _gtk_toggle_segment_new (GtkTextTagInfo *info, gboolean on)
+   seg->body.toggle.inNodeCounts = 0;
+ 
+   return seg;
++#pragma GCC diagnostic pop
+ }
+ 
+ void

gtk4.spec

@@ -17,7 +17,7 @@
 
 Name:           gtk4
 Version:        3.99.4
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        GTK graphical user interface library
 
 License:        LGPLv2+
@@ -218,6 +218,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/*.desktop
 %{_mandir}/man1/gtk4-widget-factory.1*
 
 %changelog
+* Wed Dec 09 2020 Jeff Law <law@redhat.com> - 3.99.4-3
+- Avoid diagnostics for gcc-11 false positive out of bounds accesses
+
 * Sun Nov 15 2020 Jeff Law <law@redhat.com> - 3.99.4-2
 - Fix bogus volatile caught by gcc-11