Ref T773, gcc/clang warnings

Remark: "assuming signed overflow does not occur when assuming that (X - c) > X is always false"

src/blackmisc/sequence.h

@@ -119,12 +119,21 @@ namespace BlackMisc
         //! Swap this sequence with another.
         void swap(CSequence &other) noexcept { m_impl.swap(other.m_impl); }
 
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
+#endif
+
         //! Access an element by its index.
         reference operator [](size_type index) { Q_ASSERT(index >= 0 && index < m_impl.size()); return m_impl[index]; }
 
         //! Access an element by its index.
         const_reference operator [](size_type index) const { Q_ASSERT(index >= 0 && index < m_impl.size()); return m_impl[index]; }
 
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
         //! Access the first element.
         reference front() { Q_ASSERT(!empty()); return m_impl.front(); }
 

src/blackmisc/simulation/interpolationlogger.cpp

@@ -583,5 +583,20 @@ namespace BlackMisc
             if (interpolator == 'l') { return l; }
             return u;
         }
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
+#endif
+        const CAircraftSituation &SituationLog::secondInterpolationSituation() const
+        {
+            if (interpolationSituations.size() < 2) { return Aviation::CAircraftSituation::null(); }
+            const Aviation::CAircraftSituationList::size_type i = interpolationSituations.size() - 2; // 2nd latest, latest at end
+            return interpolationSituations[i];
+        }
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
     } // namespace
 } // namespace

src/blackmisc/simulation/interpolationlogger.h

@@ -74,12 +74,7 @@ namespace BlackMisc
             }
 
             //! The second latest situation (spline)
-            const Aviation::CAircraftSituation &secondInterpolationSituation() const
-            {
-                if (interpolationSituations.size() < 2) { return Aviation::CAircraftSituation::null(); }
-                const Aviation::CAircraftSituationList::size_type i = interpolationSituations.size() - 2; // 2nd latest, latest at end
-                return interpolationSituations[i];
-            }
+            const Aviation::CAircraftSituation &secondInterpolationSituation() const;
 
             //! To string
             QString toQString(bool withSetup,