TT#111150 Enable -Wextra minus some of its warnings producing much noise

We should eventually try to reduce the amount of -Wno-* options, but for
now this is a net improvement.

Change-Id: I3bd03679acbc157c0d1b3c257a542e2eec0e5ee9

daemon/Makefile

@@ -4,7 +4,7 @@ with_iptables_option ?= yes
 with_transcoding ?= yes
 
 
-CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS?=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes
 CFLAGS+=	-pthread -fno-strict-aliasing
 CFLAGS+=	-std=c99
 CFLAGS+=	$(shell pkg-config --cflags glib-2.0)

debian/rules.modules

@@ -3,7 +3,7 @@
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
-CFLAGS ?= -Wall -Wstrict-prototypes -g
+CFLAGS ?= -g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes
 
 ifneq (,$(findstring noopt,$(DEB_BUILD_OPTIONS)))
 	CFLAGS += -O0

iptables-extension/Makefile

@@ -1,5 +1,5 @@
 CC?=gcc
-CFLAGS		?= -O2 -Wall -Wstrict-prototypes
+CFLAGS		?= -O2 -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes
 CFLAGS		+= -shared -fPIC
 ifneq ($(RTPENGINE_VERSION),)
   CFLAGS	+= -DRTPENGINE_VERSION="\"$(RTPENGINE_VERSION)\""

recording-daemon/Makefile

@@ -1,6 +1,6 @@
 TARGET=		rtpengine-recording
 
-CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS?=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes
 CFLAGS+=	-pthread -I. -I../lib/ -I../kernel-module/
 CFLAGS+=	-std=c99 -fno-strict-aliasing
 CFLAGS+=	-D_GNU_SOURCE -D_POSIX_SOURCE -D_POSIX_C_SOURCE

t/Makefile

@@ -2,7 +2,7 @@ TARGET=		all-tests
 
 with_transcoding ?= yes
 
-CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS?=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes
 PRELOAD_CFLAGS := $(CFLAGS)
 CFLAGS+=	-pthread -fno-strict-aliasing
 CFLAGS+=	-std=c99