New warning keys since GCC 7.

--HG--
branch : develop

Valentina.pro

@@ -16,6 +16,10 @@ count(LIST, 1, >): error("The build will fail. Path '$${OUT_PWD}' contains space
 unix {
     *-g++ {
         GCC_VERSION = $$system("g++ -dumpversion")
+        contains(GCC_VERSION, 7.[0-9]) {
+            message( "g++ version 7.x found" )
+            CONFIG += g++7
+        } else {
             contains(GCC_VERSION, 6.[0-9]) {
                 message( "g++ version 6.x found" )
                 CONFIG += g++6
@@ -34,6 +38,7 @@ unix {
             }
         }
     }
+}
 
 TEMPLATE = subdirs
 SUBDIRS = src

common.pri

@@ -283,6 +283,13 @@ g++6:GCC_DEBUG_CXXFLAGS += \
     -Wduplicated-cond \
     -Wmisleading-indentation
 
+# Since GCC 7
+g++7:GCC_DEBUG_CXXFLAGS += \
+    -Wduplicated-branches \
+    -Wrestrict \
+    -Walloc-zero \
+    -Wnonnull
+
 # Usefull Clang warnings keys.
 CLANG_DEBUG_CXXFLAGS += \
     -O0 \ # Turn off oprimization.