COMPMID-1310: Create graph validation executables.

Change-Id: I9e0b57b1b83fe5a95777cdaeddba6ecef650bafc
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/138697
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/examples/gc_absdiff.cpp b/examples/gc_absdiff.cpp
index 1024dac..f534592 100644
--- a/examples/gc_absdiff.cpp
+++ b/examples/gc_absdiff.cpp
@@ -38,7 +38,7 @@
 class GCAbsDiffExample : public Example
 {
 public:
-    void do_setup(int argc, char **argv) override
+    bool do_setup(int argc, char **argv) override
     {
         PPMLoader ppm1, ppm2;
 
@@ -90,6 +90,8 @@
         {
             ppm2.fill_image(src2);
         }
+
+        return true;
     }
     void do_run() override
     {