kbuild: Add rules for compiling programs on the host

At a couple of places, we need to build programs which run on the
compile host during building the kernel.

Add a new variable "host-progs" to declare such programs. Rules.make will
automatically provide rules to compile these programs with appropriate
command lines etc.

Compared to having explicit rules spread around for doing so, this has
the following advantages:

o shorter
o automatically figures out dependencies and handles changing command
  lines
o Nicer output in quiet mode ;-)

Compiling host programs from multiple sources is also possible, analogous
to multi-part objects. E.g. scripts/Makefile has

	host-progs := tkparse
	tkparse-objs := tkparse.o tkcond.o tkgen.o

Rules.make

@@ -224,6 +224,36 @@ $(multi-used-y) : %.o: $(multi-objs-y) FORCE
 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
 	$(call if_changed,cmd_link_multi)
 
+# Compile programs on the host
+# FIXME: handle dependencies
+# ===========================================================================
+
+host-progs-single     := $(foreach m,$(host-progs),$(if $($(m)-objs),,$(m)))
+host-progs-multi      := $(foreach m,$(host-progs),$(if $($(m)-objs),$(m)))
+host-progs-multi-objs := $(foreach m,$(host-progs-multi),$($(m)-objs))
+
+quiet_cmd_host_cc__c  = HOSTCC $(RELDIR)/$@
+cmd_host_cc__c        = $(HOSTCC) -Wp,-MD,.$(subst /,_,$@).d \
+			$(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -o $@ $<
+
+$(host-progs-single): %: %.c FORCE
+	$(call if_changed_dep,host_cc__c)
+
+quiet_cmd_host_cc_o_c = HOSTCC $(RELDIR)/$@
+cmd_host_cc_o_c       = $(HOSTCC) -Wp,-MD,.$(subst /,_,$@).d \
+			$(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
+
+$(host-progs-multi-objs): %.o: %.c FORCE
+	$(call if_changed_dep,host_cc_o_c)
+
+quiet_cmd_host_cc__o  = HOSTLD $(RELDIR)/$@
+cmd_host_cc__o        = $(HOSTCC) $(HOSTLDFLAGS) -o $@ $($@-objs) \
+			$(HOST_LOADLIBES)
+
+$(host-progs-multi): %: $(host-progs-multi-objs) FORCE
+	$(call if_changed,cmd_host_cc__o)
+
+
 # Descending when making module versions
 # ---------------------------------------------------------------------------
 

drivers/atm/Makefile

@@ -56,6 +56,8 @@ EXTRA_CFLAGS=-g
 
 fore_200e-objs	:= fore200e.o $(FORE200E_FW_OBJS)
 
+host-progs := fore200e_mkfirm
+
 include $(TOPDIR)/Rules.make
 
 
@@ -80,9 +82,6 @@ fore200e_sba_fw.c: $(patsubst "%", %, $(CONFIG_ATM_FORE200E_SBA_FW)) \
 	  echo 'endif' \
 	) >.$@.fw
 
-fore200e_mkfirm: fore200e_mkfirm.c
-	$(HOSTCC) $(HOSTCFLAGS) $< -o $@
-
 # deal with the various suffixes of the binary firmware images
 %.bin %.bin1 %.bin2: %.data
 	objcopy -Iihex $< -Obinary $@.gz

drivers/char/Makefile

@@ -214,17 +214,12 @@ obj-$(CONFIG_AGP) += agp/
 obj-$(CONFIG_DRM) += drm/
 obj-$(CONFIG_PCMCIA) += pcmcia/
 
-include $(TOPDIR)/Rules.make
-
-fastdep:
+host-progs := conmakehash
 
-conmakehash: conmakehash.c
-	$(HOSTCC) $(HOSTCFLAGS) -o conmakehash conmakehash.c
+include $(TOPDIR)/Rules.make
 
 consolemap_deftbl.c: $(FONTMAPFILE) conmakehash
-	./conmakehash $(FONTMAPFILE) > consolemap_deftbl.c
-
-consolemap_deftbl.o: consolemap_deftbl.c $(TOPDIR)/include/linux/types.h
+	./conmakehash $< > $@
 
 .DELETE_ON_ERROR:
 

drivers/net/hamradio/soundmodem/Makefile

@@ -16,19 +16,21 @@ soundmodem-$(CONFIG_SOUNDMODEM_PSK4800)		+= sm_psk4800.o
 soundmodem-$(CONFIG_SOUNDMODEM_FSK9600)		+= sm_fsk9600.o
 soundmodem-objs					:= $(soundmodem-y)
 
+host-progs := gentbl
+HOST_LOADLIBES := -lm
+
 include $(TOPDIR)/Rules.make
 
 # Dependencies on generates files need to be listed explicitly
 
-sm_%.o: sm_tbl_%.h
-
-TBLHDR		:= sm_tbl_afsk1200.h sm_tbl_afsk2400_7.h sm_tbl_afsk2400_8.h \
-		   sm_tbl_afsk2666.h sm_tbl_psk4800.h	 sm_tbl_hapn4800.h \
-		   sm_tbl_fsk9600.h
-
-$(TBLHDR):	gentbl
-		./gentbl
+sm_afsk1200.o:   sm_tbl_afsk1200.h
+sm_afsk2400_7.o: sm_tbl_afsk2400_7.h
+sm_afsk2400_8.o: sm_tbl_afsk2400_8.h
+sm_afsk2666.o:   sm_tbl_afsk2666.h
+sm_psk4800.o:    sm_tbl_psk4800.h
+sm_hapn4800.o:   sm_tbl_hapn4800.h
+sm_fsk9600.o:    sm_tbl_fsk9600.h
 
-gentbl:		gentbl.c
-		$(HOSTCC) $(HOSTCFLAGS) $< -o $@ -lm
+sm_tbl_%: gentbl
+	./gentbl
 

drivers/pci/Makefile

@@ -30,12 +30,11 @@ ifndef CONFIG_X86
 obj-y += syscall.o
 endif
 
+host-progs := gen-devlist
+
 include $(TOPDIR)/Rules.make
 
-names.o: names.c devlist.h classlist.h
+names.o: devlist.h classlist.h
 
 devlist.h classlist.h: pci.ids gen-devlist
 	./gen-devlist <pci.ids
-
-gen-devlist: gen-devlist.c
-	$(HOSTCC) $(HOSTCFLAGS) -o gen-devlist gen-devlist.c

drivers/video/Makefile

@@ -124,14 +124,13 @@ obj-$(CONFIG_FBCON_HGA)           += fbcon-hga.o
 obj-$(CONFIG_FBCON_STI)           += fbcon-sti.o
 obj-$(CONFIG_FBCON_ACCEL)	  += fbcon-accel.o
 
+host-progs := ../conmakehash
+
 include $(TOPDIR)/Rules.make
 
 clean:
 	rm -f core *.o *.a *.s
 
-../conmakehash: ../conmakehash.c
-	$(HOSTCC) $(HOSTCFLAGS) -o ../conmakehash ../conmakehash.c
-
 promcon_tbl.c: prom.uni ../char/conmakehash
 	../char/conmakehash prom.uni | \
 	sed -e '/#include <[^>]*>/p' -e 's/types/init/' \

drivers/zorro/Makefile

@@ -7,12 +7,11 @@ export-objs		:= zorro.o
 obj-$(CONFIG_ZORRO)	+= zorro.o names.o
 obj-$(CONFIG_PROC_FS)	+= proc.o
 
+host-progs 		:= gen_devlist
+
 include $(TOPDIR)/Rules.make
 
-names.o: names.c devlist.h
+names.o: devlist.h
 
 devlist.h: zorro.ids gen-devlist
 	./gen-devlist <zorro.ids
-
-gen-devlist: gen-devlist.c
-	$(HOSTCC) $(HOSTCFLAGS) -o gen-devlist gen-devlist.c

net/khttpd/Makefile

@@ -8,12 +8,11 @@ khttpd-objs := 	main.o accept.o datasending.o logging.o misc.o rfc.o \
 		rfc_time.o security.o sockets.o sysctl.o userspace.o \
 		waitheaders.o
 
+host-progs := make_times_h
+
 include $(TOPDIR)/Rules.make
 
 rfc_time.o: times.h
 
-make_times_h: make_times_h.c
-	$(HOSTCC) $(HOSTCFLAGS) -o make_times_h make_times_h.c
-
 times.h: make_times_h
 	./make_times_h

scripts/Makefile

@@ -9,12 +9,6 @@ CHMOD_FILES := docgen gen-all-syms kernel-doc mkcompile_h makelst
 
 all: fixdep split-include $(CHMOD_FILES)
 
-fixdep: fixdep.c
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $<
-
-split-include: split-include.c
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $<
-
 $(CHMOD_FILES): FORCE
 	@chmod a+x $@
 
@@ -43,23 +37,15 @@ kconfig.tk: $(TOPDIR)/arch/$(ARCH)/config.in tkparse $(HEADER) $(TAIL) FORCE
 	) > $@
 	chmod 755 $@
 
-tkparse: tkparse.o tkcond.o tkgen.o
-	$(HOSTCC) -o $@ $^
-
-tkparse.o tkcond.o tkgen.o: %.o: %.c
-	$(HOSTCC) $(HOSTCFLAGS) -c -o $@ $<
-
 # DocBook stuff
 # ---------------------------------------------------------------------------
 
 doc-progs: docproc
 
-docproc: docproc.c
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $<
-
-include $(TOPDIR)/Rules.make
+# ---------------------------------------------------------------------------
 
-# we don't have automatic deps for host programs
+host-progs := fixdep split-include docproc tkparse
 
-tkparse.o tkcond.o tkgen.o: tkparse.h
+tkparse-objs := tkparse.o tkcond.o tkgen.o
 
+include $(TOPDIR)/Rules.make

scripts/lxdialog/Makefile

-HOSTCFLAGS += -DLOCALE 
-LIBS = -lncurses
+HOST_EXTRACFLAGS := -DLOCALE 
+HOST_LOADLIBES   := -lncurses
 
 ifeq (/usr/include/ncurses/ncurses.h, $(wildcard /usr/include/ncurses/ncurses.h))
-        HOSTCFLAGS += -I/usr/include/ncurses -DCURSES_LOC="<ncurses.h>"
+        HOST_EXTRACFLAGS += -I/usr/include/ncurses -DCURSES_LOC="<ncurses.h>"
 else
 ifeq (/usr/include/ncurses/curses.h, $(wildcard /usr/include/ncurses/curses.h))
-        HOSTCFLAGS += -I/usr/include/ncurses -DCURSES_LOC="<ncurses/curses.h>"
+        HOST_EXTRACFLAGS += -I/usr/include/ncurses -DCURSES_LOC="<ncurses/curses.h>"
 else
 ifeq (/usr/include/ncurses.h, $(wildcard /usr/include/ncurses.h))
-        HOSTCFLAGS += -DCURSES_LOC="<ncurses.h>"
+        HOST_EXTRACFLAGS += -DCURSES_LOC="<ncurses.h>"
 else
-	HOSTCFLAGS += -DCURSES_LOC="<curses.h>"
+	HOST_EXTRACFLAGS += -DCURSES_LOC="<curses.h>"
 endif
 endif
 endif
 
+host-progs := lxdialog
 
-OBJS = checklist.o menubox.o textbox.o yesno.o inputbox.o \
-       util.o lxdialog.o msgbox.o
-
-%.o: %.c
-	$(HOSTCC) $(HOSTCFLAGS) -c -o $@ $<
+lxdialog-objs := checklist.o menubox.o textbox.o yesno.o inputbox.o \
+		 util.o lxdialog.o msgbox.o
 
 all: ncurses lxdialog
 
-lxdialog: $(OBJS)
-	$(HOSTCC) -o lxdialog $(OBJS) $(LIBS)
+include $(TOPDIR)/Rules.make
 
 ncurses:
 	@echo "main() {}" > lxtemp.c
-	@if $(HOSTCC) -lncurses lxtemp.c ; then \
+	@if $(HOSTCC) lxtemp.c  $(HOST_LOADLIBES); then \
 		rm -f lxtemp.c a.out; \
 	else \
 		rm -f lxtemp.c; \

sound/oss/Makefile

@@ -95,6 +95,7 @@ sb_lib-objs	:= sb_common.o sb_audio.o sb_midi.o sb_mixer.o sb_ess.o
 vidc_mod-objs	:= vidc.o vidc_fill.o
 wavefront-objs  := wavfront.o wf_midi.o yss225.o
 
+host-progs	:= bin2hex hex2hex
 
 include $(TOPDIR)/Rules.make
 
@@ -104,16 +105,6 @@ include $(TOPDIR)/Rules.make
 # of what name was used to build them.  If the name changes, they
 # will be forced to be remade.
 #
-# First make the utilities.
-
-bin2hex: bin2hex.c
-	$(HOSTCC) $(HOSTCFLAGS) -o bin2hex bin2hex.c
-
-hex2hex: hex2hex.c
-	$(HOSTCC) $(HOSTCFLAGS) -o hex2hex hex2hex.c
-
-
-
 
 # Turtle Beach Maui / Tropez