Now we don't suppress all warning of the compiler! This uncover some troubling warning!

theano/gof/cc.py

@@ -526,11 +526,15 @@ class CLinker(link.Linker):
 
         This might contain duplicates.
         """
-        ret = ["-O3", "-w"]#-w means supress all warnings
-# this is the param the -ffast-math activate. I put the explicitly as FillMissing must disable "-ffinite-math-only". Putting -ffast-math would make it disable all other parameter at the same time.
+        ret = ["-O3"]
+# this is the param the -ffast-math activate. I put the explicitly as FillMissing must disable some of them. Putting -ffast-math would make it disable all other parameter at the same time.
         ret += ["-fno-math-errno", "-funsafe-math-optimizations",
                 "-fno-signaling-nans", "-fcx-limited-range",
-                "-fno-rounding-math", "-ffinite-math-only"]
+                "-fno-rounding-math", "-ffinite-math-only",
+                "-Wno-unused-label",#the current code generate label event if they are not used. Could use gcc attribute for those label only
+                "-Wno-unused-variable",#idem as the precedent
+                "-Wno-write-strings",#generated by our code generator...
+                ]
         for x in [y.type for y in self.variables] + [y.op for y in self.node_order]:
             try: ret += x.c_compile_args()
             except utils.MethodNotDefined: pass