Extended list of GCC warning flags.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

m4.include/mc-cflags.m4

@@ -48,11 +48,14 @@ dnl    MC_CHECK_ONE_CFLAG([-fno-stack-protector])
 esac
 
 dnl Sorted -W options:
+dnl    MC_CHECK_ONE_CFLAG([-Wbad-function-cast])
     MC_CHECK_ONE_CFLAG([-Wcomment])
     MC_CHECK_ONE_CFLAG([-Wdeclaration-after-statement])
+    MC_CHECK_ONE_CFLAG([-Wfloat-equal])
     MC_CHECK_ONE_CFLAG([-Wformat])
-    MC_CHECK_ONE_CFLAG([-Wimplicit-function-declaration])
-    MC_CHECK_ONE_CFLAG([-Wimplicit-int])
+    MC_CHECK_ONE_CFLAG([-Wformat-security])
+    MC_CHECK_ONE_CFLAG([-Wimplicit])
+    MC_CHECK_ONE_CFLAG([-Wignored-qualifiers])
     MC_CHECK_ONE_CFLAG([-Wmissing-braces])
     MC_CHECK_ONE_CFLAG([-Wmissing-declarations])
     MC_CHECK_ONE_CFLAG([-Wmissing-parameter-type])
@@ -63,12 +66,14 @@ dnl Sorted -W options:
     MC_CHECK_ONE_CFLAG([-Wparentheses])
     MC_CHECK_ONE_CFLAG([-Wpointer-sign])
     MC_CHECK_ONE_CFLAG([-Wreturn-type])
-dnl    MC_CHECK_ONE_CFLAG([-Wsequence-point])
+    MC_CHECK_ONE_CFLAG([-Wsequence-point])
     MC_CHECK_ONE_CFLAG([-Wshadow])
     MC_CHECK_ONE_CFLAG([-Wsign-compare])
 dnl    MC_CHECK_ONE_CFLAG([-Wstrict-aliasing])
     MC_CHECK_ONE_CFLAG([-Wswitch])
+    MC_CHECK_ONE_CFLAG([-Wtype-limits])
     MC_CHECK_ONE_CFLAG([-Wuninitialized])
+dnl    MC_CHECK_ONE_CFLAG([-Wunused-but-set-variable])
     MC_CHECK_ONE_CFLAG([-Wunused-function])
     MC_CHECK_ONE_CFLAG([-Wunused-label])
     MC_CHECK_ONE_CFLAG([-Wunused-parameter])