X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=Rules.mak;h=8e03a0a12a393c7e8ca6970b5cc02c1027180ac4;hb=c44bc986b738977c5cd9741d9752a41ac022602f;hp=377a90b0790aec1114ef7b4e941653fa9bb237ed;hpb=461cdc89a9d25aa3e1807ebfaafbfb272c56584d;p=oweals%2Fbusybox.git

diff --git a/Rules.mak b/Rules.mak
index 377a90b07..8e03a0a12 100644
--- 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 $(top_builddir)/.config
+endif
+
 #--------------------------------------------------------
 PROG      := busybox
-VERSION   := 1.00-rc2
+MAJOR_VERSION   :=1
+MINOR_VERSION   :=2
+SUBLEVEL_VERSION:=0
+EXTRAVERSION    :=-pre0
+VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 
 
@@ -27,31 +24,31 @@ 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=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
 #--------------------------------------------------------
 
 # If you are running a cross compiler, you will want to set 'CROSS'
 # 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 $(CROSS_COMPILER_PREFIX)))
+CROSS          =$(strip $(subst ",, $(strip $(CROSS_COMPILER_PREFIX))))
+# be gentle to vi coloring.. "))
 CC             = $(CROSS)gcc
 AR             = $(CROSS)ar
 AS             = $(CROSS)as
 LD             = $(CROSS)ld
 NM             = $(CROSS)nm
 STRIP          = $(CROSS)strip
+ELF2FLT        = $(CROSS)elf2flt
 CPP            = $(CC) -E
-MAKEFILES      = $(TOPDIR).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
 
@@ -60,11 +57,6 @@ LC_ALL:= C
 # 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...
 #
@@ -76,17 +68,24 @@ BB_SRC_DIR=
 # 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")
+#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
+#GCCINCDIR:=$(shell gcc -print-search-dirs | $(SED) -ne "s/install: \(.*\)/\1include/gp")
 
-WARNINGS=-Wall -Wstrict-prototypes -Wshadow
-CFLAGS=-I$(TOPDIR)include
-ARFLAGS=-r
+# This must bind late because srcdir is reset for every source subdirectory.
+INCS:=-I$(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 CC AR AS LD NM STRIP CPP
 ifeq ($(strip $(TARGET_ARCH)),)
-TARGET_ARCH=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
+TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
 		-e 's/i.86/i386/' \
 		-e 's/sparc.*/sparc/' \
 		-e 's/arm.*/arm/g' \
@@ -100,14 +99,95 @@ TARGET_ARCH=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
 		)
 endif
 
-# Pull in the user's busybox configuration
-ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
--include $(TOPDIR).config
+# A nifty macro to make testing gcc features easier, but note that everything
+# that uses this _must_ use := or it will be re-evaluated everytime it is
+# referenced.
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_CC=echo CC=\"$(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 "$(3)"; fi ; \
+		rm -f conftest.c conftest.o; \
+	fi)
+
+# A not very robust macro to check for available ld flags
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_LD=echo LD=\"$(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)
+
+# A not very robust macro to check for available strip flags
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(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)
+
+
+
+# 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 ; \
+	$(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
+	 -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
+	echo rm conftest_main.o conftest_main.c conftest.o conftest.c \
+	 conftest.a conftest > /dev/null 2>&1 ; )
+ifneq ($(findstring start-group,$(LD_START_GROUP)),)
+LD_END_GROUP:= -Wl,--end-group
+endif
+
+CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
+
+# 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),-mmax-stack-frame=256,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
+
+# Preemptively pin this too.
+PROG_CFLAGS:=
 
-# A nifty macro to make testing gcc features easier
-check_gcc=$(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
-	then echo "$(1)"; else echo "$(2)"; fi)
 
 #--------------------------------------------------------
 # Arch specific compiler optimization stuff should go here.
@@ -115,20 +195,52 @@ check_gcc=$(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1;
 # for OPTIMIZATION...
 
 # use '-Os' optimization if available, else use -O2
-OPTIMIZATION=
-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,\
+	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 $$?)),0)
+	OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 		-malign-functions=0 -malign-jumps=0 -malign-loops=0)
+#endif # gcc-4.0 and older
+
+# gcc-4.1 and beyond seem to benefit from these
+ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),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,)
 
 #
 #--------------------------------------------------------
@@ -152,35 +264,65 @@ 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) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
-    LDFLAGS += -s -Wl,-warn-common
-    STRIPCMD:=$(STRIP) --remove-section=.note --remove-section=.comment
+    CFLAGS +=-DNDEBUG
+    CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
+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,)
+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
 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
@@ -189,12 +331,91 @@ endif
 # have a chance of winning.
 CFLAGS += $(CFLAGS_EXTRA)
 
-%.o: %.c
-	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
-
-.PHONY: dummy
+#------------------------------------------------------------
+# Installation options
+ifeq ($(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 ($(V)$(VERBOSE),)
+SECHO := @-false
+DISP  := ver
+Q     := 
+else
+SECHO := @echo
+DISP  := pur
+Q     := @
+endif
+endif
 
+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 = true
+sil_disp_compile.h = true
+sil_disp_strip     = true
+sil_disp_link      = true
+sil_disp_link.h    = true
+sil_disp_ar        = true
+sil_disp_elf2flt   = true
+ver_disp_compile.c = echo $(cmd_compile.c)
+ver_disp_compile.h = echo $(cmd_compile.h)
+ver_disp_strip     = echo $(cmd_strip)
+ver_disp_link      = echo $(cmd_link)
+ver_disp_link.h    = echo $(cmd_link.h)
+ver_disp_ar        = echo $(cmd_ar)
+ver_disp_elf2flt   = echo $(cmd_elf2flt)
+disp_compile.c     = $($(DISP)_disp_compile.c)
+disp_compile.h     = $($(DISP)_disp_compile.h)
+disp_strip         = $($(DISP)_disp_strip)
+disp_link          = $($(DISP)_disp_link)
+disp_link.h        = $($(DISP)_disp_link.h)
+disp_ar            = $($(DISP)_disp_ar)
+disp_gen           = $(SECHO) "  "GEN $@ ; true
+disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
+disp_elf2flt       = $($(DISP)_disp_elf2flt)
+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)
+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)      ; $(cmd_link)
+do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
+do_ar              = @$(disp_ar)        ; $(cmd_ar)
+do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)
 
-.EXPORT_ALL_VARIABLES:
+uppercase = $(shell echo $1 | tr '[:lower:]' '[:upper:]')
+%.a:
+	@if test -z "$($(call uppercase,$*)_DIR)" ; then \
+		echo "Invalid target $@" ; \
+		exit 1 ; \
+	fi
+	$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 
+.PHONY: dummy