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busybox/Rules.mak

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# Rules.make for busybox
#
# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
#
# 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 $(top_builddir)/.config
endif
#--------------------------------------------------------
PROG := busybox
MAJOR_VERSION :=1
MINOR_VERSION :=2
SUBLEVEL_VERSION:=0
EXTRAVERSION :=-svn
VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
#--------------------------------------------------------
# With a modern GNU make(1) (highly recommended, that's what all the
# developers use), all of the following configuration values can be
# overridden at the command line. For example:
# make CROSS_COMPILE=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
#--------------------------------------------------------
# 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
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 = $(CC) -E
SED ?= sed
BZIP2 ?= bzip2
# What OS are you compiling busybox for? This allows you to include
# OS specific things, syscall overrides, etc.
TARGET_OS=linux
# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
LC_ALL:= C
# This must bind late because srcdir is reset for every source subdirectory.
INCS:=-I$(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__ | $(CC) -E -xc - | tail -n 1))
#--------------------------------------------------------
export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS_COMPILE CC AR AS LD NM STRIP CPP
ifeq ($(strip $(TARGET_ARCH)),)
TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
-e 's/i.86/i386/' \
-e 's/sparc.*/sparc/' \
-e 's/arm.*/arm/g' \
-e 's/m68k.*/m68k/' \
-e 's/ppc/powerpc/g' \
-e 's/v850.*/v850/g' \
-e 's/sh[234]/sh/' \
-e 's/mips-.*/mips/' \
-e 's/mipsel-.*/mipsel/' \
-e 's/cris.*/cris/' \
)
endif
# A nifty macro to make testing gcc features easier, but note that everything
# that uses this _must_ use := or it will be re-evaluated everytime it is
# referenced.
ifeq ($(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 "$(3)"; fi ; \
rm -f conftest.c conftest.o; \
fi)
ifneq ($(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)
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:=$(call check_cc,$(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 $$?)),0)
CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
endif
OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
# This prevents us from using -fwhole-program when we build the lib
PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
endif # CONFIG_BUILD_LIBBUSYBOX
endif # CONFIG_BUILD_AT_ONCE
LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
# Some nice architecture specific optimizations
ifeq ($(strip $(TARGET_ARCH)),arm)
OPTIMIZATION+=-fstrict-aliasing
endif
ifeq ($(strip $(TARGET_ARCH)),i386)
OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
# gcc-4.0 and older seem to benefit from these
ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),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
OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
#
#--------------------------------------------------------
# If you're going to do a lot of builds with a non-vanilla configuration,
# it makes sense to adjust parameters above, so you can type "make"
# by itself, instead of following it by the same half-dozen overrides
# every time. The stuff below, on the other hand, is probably less
# prone to casual user adjustment.
#
ifeq ($(strip $(CONFIG_LFS)),y)
# For large file summit support
CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
endif
ifeq ($(strip $(CONFIG_DMALLOC)),y)
# For testing mem leaks with dmalloc
CFLAGS+=-DDMALLOC
LIBRARIES:=-ldmalloc
else
ifeq ($(strip $(CONFIG_EFENCE)),y)
LIBRARIES:=-lefence
endif
endif
# Debugging info
ifeq ($(strip $(CONFIG_DEBUG)),y)
CFLAGS +=-g
else
CFLAGS +=-DNDEBUG
endif
ifneq ($(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)
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 $(CONFIG_GETOPT_LONG)),y)
CFLAGS += -D__need_getopt
endif
# Additional complications due to support for pristine source dir.
# Include files in the build directory should take precedence over
# the copy in top_srcdir, both during the compilation phase and the
# shell script that finds the list of object files.
# Work in progress by <ldoolitt@recycle.lbl.gov>.
OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
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.
-include $(top_builddir)/.config.mak
#------------------------------------------------------------
# Installation options
ifeq ($(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
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
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