Add warnings to userspace compile flags.

bench/Makefile

@@ -2,6 +2,8 @@
 OSROOT=..
 include ../crosscompilemakefile.mak
 
+CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra
+
 INITRDDIR:=../initrd
 LOCALBINARIES:=\
 benchsyscall \

crosscompilemakefile.mak

@@ -16,21 +16,21 @@ ifeq ($(CPU),x64)
     CPULDFLAGS=-melf_x86_64
 endif
 
-LIBMAXSIROOT=$(OSROOT)/libmaxsi
+LIBMAXSIROOT:=$(OSROOT)/libmaxsi
-SORTIXROOT=$(OSROOT)/sortix
+SORTIXROOT:=$(OSROOT)/sortix
 
-LIBC=$(LIBMAXSIROOT)/start.o $(LIBMAXSIROOT)/libc.a
+LIBC:=$(LIBMAXSIROOT)/start.o $(LIBMAXSIROOT)/libc.a
-LIBS=$(LIBC)
+LIBS:=$(LIBC)
 
-CPPFLAGS=$(CPUDEFINES) -U_GNU_SOURCE -Ulinux -Dsortix
+CPPFLAGS:=$(CPUDEFINES) -U_GNU_SOURCE -Ulinux -Dsortix
-FLAGS=-nostdinc -nostdlib -fno-builtin -nostartfiles -nodefaultlibs
+FLAGS:=-nostdinc -nostdlib -nostartfiles -nodefaultlibs
-INCLUDES=-I $(LIBMAXSIROOT)/preproc -I $(SORTIXROOT)/include
+INCLUDES:=-I $(LIBMAXSIROOT)/preproc -I $(SORTIXROOT)/include
 
-LD=ld
+LD:=ld
-LDFLAGS=$(CPULDFLAGS)
+LDFLAGS:=$(CPULDFLAGS)
-CC=gcc
+CC:=gcc
-CFLAGS=$(CPUFLAGS) $(FLAGS) $(INCLUDES)
+CFLAGS:=$(CPUFLAGS) $(FLAGS) $(INCLUDES)
-CXX=g++
+CXX:=g++
-CXXFLAGS=$(CPUFLAGS) $(FLAGS) $(INCLUDES) -fno-exceptions -fno-rtti
+CXXFLAGS:=$(CPUFLAGS) $(FLAGS) $(INCLUDES) -fno-exceptions -fno-rtti
 
 

games/Makefile

@@ -2,6 +2,8 @@
 OSROOT=..
 include ../crosscompilemakefile.mak
 
+CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra
+
 INITRDDIR:=../initrd
 LOCALBINARIES:=\
 pong \

utils/Makefile

@@ -2,6 +2,8 @@
 OSROOT=..
 include ../crosscompilemakefile.mak
 
+CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra
+
 INITRDDIR:=../initrd
 LOCALBINARIES:=\
 init \