kbuild: Consistent use of [AC]FLAGS_KERNEL and MODFLAGS

We have
o CFLAGS_KERNEL: Additional flags for files compiled into vmlinux
o AFLAGS_KERNEL: Additional flags for files assembled into vmlinux
o MODFLAGS: Additonal flags for files compiled as module

For consistency, rename MODFLAGS to CFLAGS_MODULE, introduce
AFLAGS_MODULE but leave it empty for now.

While we're at, removing "MAKING_MODULES=1", nobody is using it.

Makefile

@@ -38,13 +38,15 @@ MAKEFILES	= $(TOPDIR)/.config
 GENKSYMS	= /sbin/genksyms
 DEPMOD		= /sbin/depmod
 MODFLAGS	= -DMODULE
+CFLAGS_MODULE   = $(MODFLAGS)
+AFLAGS_MODULE   =
 CFLAGS_KERNEL	=
 AFLAGS_KERNEL	=
 PERL		= perl
 
 export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 	CONFIG_SHELL TOPDIR HPATH HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
-	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE MAKEFILES GENKSYMS MODFLAGS PERL
+	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE MAKEFILES GENKSYMS PERL
 
 all:	do-it-all
 
@@ -155,7 +157,9 @@ DRIVERS := $(DRIVERS-y)
 
 include arch/$(ARCH)/Makefile
 
-export	CPPFLAGS CFLAGS CFLAGS_KERNEL AFLAGS AFLAGS_KERNEL
+export CPPFLAGS
+export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 
+export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 
 export	NETWORKS DRIVERS LIBS HEAD LDFLAGS LINKFLAGS MAKEBOOT ASFLAGS
 
@@ -287,7 +291,7 @@ modules: $(patsubst %, _mod_%, $(SUBDIRS))
 
 .PHONY: $(patsubst %, _mod_%, $(SUBDIRS))
 $(patsubst %, _mod_%, $(SUBDIRS)) : include/linux/version.h include/config/MARKER
-	@$(MAKE) -C $(patsubst _mod_%, %, $@) CFLAGS="$(CFLAGS) $(MODFLAGS)" MAKING_MODULES=1 modules
+	@$(MAKE) -C $(patsubst _mod_%, %, $@) CFLAGS="$(CFLAGS) $(CFLAGS_MODULE)" AFLAGS="$(AFLAGS) $(AFLAGS_MODULE)" modules
 
 #	Install modules
 

arch/sparc64/solaris/Makefile

@@ -5,7 +5,7 @@
 EXTRA_AFLAGS := -ansi
 
 ifeq ($(CONFIG_SOLARIS_EMUL),m)
-  EXTRA_AFLAGS += $(MODFLAGS)
+  EXTRA_AFLAGS += $(CFLAGS_MODULE) # FIXME
 endif
 
 solaris-objs := entry64.o fs.o misc.o signal.o systbl.o socket.o \