svn 15355 replaced "BusyBox is licensed under the GNU General Public Public
[oweals/busybox.git] / Rules.mak
index 442f0fba06acf281165d1b3e1cf9f5536dcd15bd..d8614e625706d852d05c0aa727618755226c6cf6 100644 (file)
--- a/Rules.mak
+++ b/Rules.mak
@@ -1,25 +1,22 @@
 # Rules.make for busybox
 #
-# Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+# Licensed under GPLv2, see the file LICENSE in this tarball for details.
 #
 
+# Pull in the user's busybox configuration
+ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
+-include $(top_builddir)/.config
+endif
+
 #--------------------------------------------------------
 PROG      := busybox
-VERSION   := 1.00
+MAJOR_VERSION   :=1
+MINOR_VERSION   :=2
+SUBLEVEL_VERSION:=0
+EXTRAVERSION    :=-svn
+VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 
 
@@ -27,66 +24,47 @@ BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 # With a modern GNU make(1) (highly recommended, that's what all the
 # developers use), all of the following configuration values can be
 # overridden at the command line.  For example:
-#   make CROSS=powerpc-linux- BB_SRC_DIR=$HOME/busybox PREFIX=/mnt/app
+#   make CROSS_COMPILE=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
 #--------------------------------------------------------
 
-# If you are running a cross compiler, you will want to set 'CROSS'
+# If you are running a cross compiler, you will want to set CROSS_COMPILE
 # to something more interesting...  Target architecture is determined
 # by asking the CC compiler what arch it compiles things for, so unless
 # your compiler is broken, you should not need to specify TARGET_ARCH
-CROSS           =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
-CC             = $(CROSS)gcc
-AR             = $(CROSS)ar
-AS             = $(CROSS)as
-LD             = $(CROSS)ld
-NM             = $(CROSS)nm
-STRIP          = $(CROSS)strip
+CC             = $(CROSS_COMPILE)gcc
+AR             = $(CROSS_COMPILE)ar
+AS             = $(CROSS_COMPILE)as
+LD             = $(CROSS_COMPILE)ld
+NM             = $(CROSS_COMPILE)nm
+STRIP          = $(CROSS_COMPILE)strip
+ELF2FLT        = $(CROSS_COMPILE)elf2flt
 CPP            = $(CC) -E
-# MAKEFILES      = $(top_builddir)/.config
+SED           ?= sed
+BZIP2         ?= bzip2
+
 
 # What OS are you compiling busybox for?  This allows you to include
 # OS specific things, syscall overrides, etc.
 TARGET_OS=linux
 
-# Select the compiler needed to build binaries for your development system
-HOSTCC    = gcc
-HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
-
 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 LC_ALL:= C
 
-# If you want to add some simple compiler switches (like -march=i686),
-# especially from the command line, use this instead of CFLAGS directly.
-# For optimization overrides, it's better still to set OPTIMIZATION.
-CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
-
-# If you have a "pristine" source directory, point BB_SRC_DIR to it.
-# Experimental and incomplete; tell the mailing list
-# <busybox@busybox.net> if you do or don't like it so far.
-BB_SRC_DIR=
-
-# To compile vs some other alternative libc, you may need to use/adjust
-# the following lines to meet your needs...
-#
-# If you are using Red Hat 6.x with the compatible RPMs (for developing under
-# Red Hat 5.x and glibc 2.0) uncomment the following.  Be sure to read about
-# using the compatible RPMs (compat-*) at http://www.redhat.com !
-#LIBCDIR:=/usr/i386-glibc20-linux
-#
-# For other libraries, you are on your own.  But these may (or may not) help...
-#LDFLAGS+=-nostdlib
-#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
-#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR)
-#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
-
-WARNINGS=-Wall -Wstrict-prototypes -Wshadow
-CFLAGS=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
+# This must bind late because srcdir is reset for every source subdirectory.
+INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
+CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
+CFLAGS+=$(CHECKED_CFLAGS)
 ARFLAGS=cru
 
+# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
+# get the CC MAJOR/MINOR version
+CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
+CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
+
 #--------------------------------------------------------
-export VERSION BUILDTIME TOPDIR HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
+export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS_COMPILE CC AR AS LD NM STRIP CPP
 ifeq ($(strip $(TARGET_ARCH)),)
-TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
+TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
                -e 's/i.86/i386/' \
                -e 's/sparc.*/sparc/' \
                -e 's/arm.*/arm/g' \
@@ -100,46 +78,165 @@ TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
                )
 endif
 
-# Pull in the user's busybox configuration
-ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
--include $(top_builddir)/.config
+# A nifty macro to make testing gcc features easier, but note that everything
+# that uses this _must_ use := or it will be re-evaluated everytime it is
+# referenced.
+ifeq ($(strip $(BUILD_VERBOSE)),2)
+VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
 endif
+check_cc=$(shell \
+       $(VERBOSE_CHECK_CC) \
+       if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+               echo "int i;" > ./conftest.c; \
+               if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
+               then echo "$(2)"; else echo "$(3)"; fi ; \
+               rm -f conftest.c conftest.o; \
+       fi)
 
-# A nifty macro to make testing gcc features easier
-check_gcc=$(shell \
-       if [ "$(1)" != "" ]; then \
-               if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
-               then echo "$(1)"; else echo "$(2)"; fi \
+ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
+check_cc:=
+endif
+
+# A not very robust macro to check for available ld flags
+ifeq ($(strip $(BUILD_VERBOSE)),2)
+VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
+endif
+check_ld=$(shell \
+       $(VERBOSE_CHECK_LD) \
+       if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+               $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
+               echo "-Wl,$(2)" ; \
        fi)
 
-# Setup some shortcuts so that silent mode is silent like it should be
-ifeq ($(subst s,,$(MAKEFLAGS)),$(MAKEFLAGS))
-export MAKE_IS_SILENT=n
-SECHO=@echo
-else
-export MAKE_IS_SILENT=y
-SECHO=-@false
+ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
+check_ld:=
+endif
+
+# A not very robust macro to check for available strip flags
+ifeq ($(strip $(BUILD_VERBOSE)),2)
+VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
+endif
+check_strip=$(shell \
+       $(VERBOSE_CHECK_STRIP) \
+       if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+               echo "int i;" > ./conftest.c ; \
+               $(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
+               $(1) $(2) conftest.o > /dev/null 2>&1 && \
+               echo "$(1) $(2)" || echo "$(3)"; \
+               rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
+       fi)
+
+ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
+check_strip:=
 endif
 
+
+# Select the compiler needed to build binaries for your development system
+HOSTCC     = gcc
+HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
+
+LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
+       $(CC) -c -o conftest.o conftest.c ; \
+       echo "int main(void){return 0;}" > conftest_main.c ; \
+       $(CC) -c -o conftest_main.o conftest_main.c ; \
+       $(AR) $(ARFLAGS) conftest.a conftest.o ; \
+       $(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
+        conftest_main.o -o conftest > /dev/null 2>&1 \
+        && echo "-Wl,--whole-archive" ; \
+       rm conftest_main.o conftest_main.c conftest.o conftest.c \
+        conftest.a conftest > /dev/null 2>&1 ; )
+ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
+LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
+endif
+
+LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
+       $(CC) -c -o conftest.o conftest.c ; \
+       echo "int main(void){return bar();}" > conftest_main.c ; \
+       $(CC) -c -o conftest_main.o conftest_main.c ; \
+       $(AR) $(ARFLAGS) conftest.a conftest.o ; \
+       $(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
+        -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
+       rm conftest_main.o conftest_main.c conftest.o conftest.c \
+        conftest.a conftest > /dev/null 2>&1 ; )
+ifneq ($(findstring start-group,$(LD_START_GROUP)),)
+LD_END_GROUP:= -Wl,--end-group
+endif
+
+CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
+#CHECKED_LDFLAGS := $(call check_ld,$(LD),-static-libgcc,)
+
+# Pin CHECKED_CFLAGS with := so it's only evaluated once.
+CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-finline-limit=0,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winline,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-static-libgcc,)
+
+# Preemptively pin this too.
+PROG_CFLAGS:=
+
+
 #--------------------------------------------------------
 # Arch specific compiler optimization stuff should go here.
 # Unless you want to override the defaults, do not set anything
 # for OPTIMIZATION...
 
 # use '-Os' optimization if available, else use -O2
-OPTIMIZATION:=$(call check_gcc,-Os,-O2)
+OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
+
+ifeq ($(CONFIG_BUILD_AT_ONCE),y)
+# gcc 2.95 exits with 0 for "unrecognized option"
+ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
+       CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
+endif
+OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
+OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
+ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
+# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
+# This prevents us from using -fwhole-program when we build the lib
+PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
+endif # CONFIG_BUILD_LIBBUSYBOX
+endif # CONFIG_BUILD_AT_ONCE
+
+LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
+
 
 # Some nice architecture specific optimizations
 ifeq ($(strip $(TARGET_ARCH)),arm)
        OPTIMIZATION+=-fstrict-aliasing
 endif
 ifeq ($(strip $(TARGET_ARCH)),i386)
-       OPTIMIZATION+=$(call check_gcc,-march=i386,)
-       OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
-       OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\
-               -malign-functions=0 -malign-jumps=0 -malign-loops=0)
+       OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
+# gcc-4.0 and older seem to benefit from these
+ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
+       OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
+       OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1, -malign-functions=0 -malign-jumps=0 -malign-loops=0,)
+
+       # gcc 4.1 produces many broken, totally invalid warnings
+       CHECKED_CFLAGS+=$(call check_cc,$(CC),-Werror,)
+endif # gcc-4.0 and older
+
+# gcc-4.1 and beyond seem to benefit from these
+ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
+       # turn off flags which hurt -Os
+       OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
+       OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
+       OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
+
+       OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
+endif # gcc-4.1 and beyond
 endif
-OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer
+OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
+CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 
 #
 #--------------------------------------------------------
@@ -163,45 +260,174 @@ else
        LIBRARIES:=-lefence
     endif
 endif
+
+# Debugging info
+
 ifeq ($(strip $(CONFIG_DEBUG)),y)
-    CFLAGS  +=$(WARNINGS) -g -D_GNU_SOURCE
-    LDFLAGS +=-Wl,-warn-common
-    STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
+    CFLAGS +=-g
 else
-    CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
-    LDFLAGS += -Wl,-warn-common
-    STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
+    CFLAGS +=-DNDEBUG
+endif
+
+ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
+    CFLAGS += $(OPTIMIZATION)
+endif
+
+# warn a bit more verbosely for non-release versions
+ifneq ($(EXTRAVERSION),)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 endif
+STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 ifeq ($(strip $(CONFIG_STATIC)),y)
-    LDFLAGS += --static
+    PROG_CFLAGS += $(call check_cc,$(CC),-static,)
+else
+    ifneq ($(strip $(CONFIG_DEBUG)),y)
+        OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
+        CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
+    endif
+endif
+CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
+LIB_CFLAGS+=$(CFLAGS_SHARED)
+
+ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+    CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
+    LIB_CFLAGS+=$(CFLAGS_PIC)
+endif
+
+ifeq ($(strip $(CONFIG_SELINUX)),y)
+    LIBRARIES += -lselinux -lsepol
 endif
 
 ifeq ($(strip $(PREFIX)),)
     PREFIX:=`pwd`/_install
 endif
 
+ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
+    CFLAGS += -D__need_getopt
+endif
+
 # Additional complications due to support for pristine source dir.
 # Include files in the build directory should take precedence over
-# the copy in BB_SRC_DIR, both during the compilation phase and the
+# the copy in top_srcdir, both during the compilation phase and the
 # shell script that finds the list of object files.
 # Work in progress by <ldoolitt@recycle.lbl.gov>.
-#
-ifneq ($(strip $(BB_SRC_DIR)),)
-    VPATH:=$(BB_SRC_DIR)
-endif
+
 
 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
-CFLAGS    += $(CROSS_CFLAGS)
+CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
+LDFLAGS += $(CHECKED_LDFLAGS)
+
 ifdef BB_INIT_SCRIPT
     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 endif
 
 # Put user-supplied flags at the end, where they
 # have a chance of winning.
-CFLAGS += $(CFLAGS_EXTRA)
+-include $(top_builddir)/.config.mak
 
-.PHONY: dummy
+#------------------------------------------------------------
+# Installation options
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
+INSTALL_OPTS=--hardlinks
+endif
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
+INSTALL_OPTS=--symlinks
+endif
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
+INSTALL_OPTS=
+endif
 
+#------------------------------------------------------------
+# Make the output nice and tight
+MAKEFLAGS += --no-print-directory
+export MAKE_IS_SILENT=n
+ifneq ($(findstring s,$(MAKEFLAGS)),)
+export MAKE_IS_SILENT=y
+SECHO := @-false
+DISP  := sil
+Q     := @
+else
+ifneq ($(BUILD_VERBOSE),)
+SECHO := @-false
+DISP  := ver
+Q     := 
+else
+SECHO := @echo
+DISP  := pur
+Q     := @
+endif
+endif
 
-.EXPORT_ALL_VARIABLES:
+show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
+pur_disp_compile.c = echo "  "CC $(show_objs) ;
+pur_disp_compile.h = echo "  "HOSTCC $(show_objs) ;
+pur_disp_strip     = echo "  "STRIP $(show_objs) ;
+pur_disp_link      = echo "  "LINK $(show_objs) ;
+pur_disp_link.h    = echo "  "HOSTLINK $(show_objs) ;
+pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs) ;
+pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs) ;
+sil_disp_compile.c = 
+sil_disp_compile.h = 
+sil_disp_strip     = 
+sil_disp_link      = 
+sil_disp_link.h    = 
+sil_disp_ar        = 
+sil_disp_elf2flt   = 
+ver_disp_compile.c = 
+ver_disp_compile.h = 
+ver_disp_strip     = 
+ver_disp_link      = 
+ver_disp_link.h    = 
+ver_disp_ar        = 
+ver_disp_elf2flt   = 
+disp_compile.c     = $(Q)$($(DISP)_disp_compile.c)
+disp_compile.h     = $(Q)$($(DISP)_disp_compile.h)
+disp_strip         = $(Q)$($(DISP)_disp_strip)
+disp_link          = $(Q)$($(DISP)_disp_link)
+disp_link.h        = $(Q)$($(DISP)_disp_link.h)
+disp_ar            = $(Q)$($(DISP)_disp_ar)
+disp_elf2flt       = $(Q)$($(DISP)_disp_elf2flt)
+disp_gen           = $(SECHO) "  "GEN $@ ; true
+disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
+cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
+cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
+cmd_strip          = $(STRIPCMD) $@
+cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
+                       $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
+                       -o $@ $(LD_START_GROUP)  \
+                       $(APPLETS_DEFINE) $(APPLET_SRC) \
+                       $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
+                       $(LDBUSYBOX) $(LIBRARIES) \
+                       $(LD_END_GROUP)
+cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
+                       $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
+                       -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
+                       $(LIBRARY_DEFINE) $(^) \
+                       $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
+cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
+cmd_ar             = $(AR) $(ARFLAGS) $@ $^
+cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
+compile.c          = $(disp_compile.c) $(cmd_compile.c)
+compile.h          = $(disp_compile.h) $(cmd_compile.h)
+do_strip           = $(disp_strip)     $(cmd_strip)
+do_link            = $(disp_link)      $(cmd_link)
+do_link.so         = $(disp_link)      $(cmd_link.so)
+do_link.h          = $(disp_link.h)    $(cmd_link.h)
+do_ar              = $(disp_ar)        $(cmd_ar)
+do_elf2flt         = $(disp_elf2flt)   $(cmd_elf2flt)
 
+uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
+%.a:
+       @if test -z "$($(call uppercase,$*)_DIR)" ; then \
+               echo "Invalid target $@" ; \
+               exit 1 ; \
+       fi
+       $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
+
+.PHONY: dummy