Enable gcc flag -Wmissing-prototypes

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5929 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile.target

@@ -73,7 +73,7 @@ PROGS=$(QEMU_PROG)
 
 # We require -O2 to avoid the stack setup prologue in EXIT_TB
 OP_CFLAGS := -O2 -g -fno-strict-aliasing
-OP_CFLAGS += -Wall -Wundef -Wendif-labels -Wwrite-strings
+OP_CFLAGS += -Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes
 
 # cc-option
 # Usage: OP_CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)

configure

@@ -381,7 +381,7 @@ done
 
 # default flags for all hosts
 CFLAGS="$CFLAGS -O2 -g -fno-strict-aliasing"
-CFLAGS="$CFLAGS -Wall -Wundef -Wendif-labels -Wwrite-strings"
+CFLAGS="$CFLAGS -Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes"
 LDFLAGS="$LDFLAGS -g"
 if test "$werror" = "yes" ; then
 CFLAGS="$CFLAGS -Werror"