e28d1d6fdc
- rename check_gcc to check_cc and pass the CC to use as arg#1; peruse check_cc for HOSTCFLAGS
- add and use check_strip
- add checks for {,no-}whole-archive and {start,end}-group LD flags
422 lines
15 KiB
Makefile
422 lines
15 KiB
Makefile
# Rules.make for busybox
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#
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# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
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#
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# Licensed under GPLv2, see the file LICENSE in this tarball for details.
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#
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# Pull in the user's busybox configuration
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ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
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-include $(top_builddir)/.config
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endif
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#--------------------------------------------------------
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PROG := busybox
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MAJOR_VERSION :=1
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MINOR_VERSION :=2
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SUBLEVEL_VERSION:=0
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EXTRAVERSION :=-pre0
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VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
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BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
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#--------------------------------------------------------
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# With a modern GNU make(1) (highly recommended, that's what all the
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# developers use), all of the following configuration values can be
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# overridden at the command line. For example:
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# make CROSS=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
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#--------------------------------------------------------
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# If you are running a cross compiler, you will want to set 'CROSS'
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# to something more interesting... Target architecture is determined
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# by asking the CC compiler what arch it compiles things for, so unless
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# your compiler is broken, you should not need to specify TARGET_ARCH
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CROSS =$(strip $(subst ",, $(strip $(CROSS_COMPILER_PREFIX))))
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# be gentle to vi coloring.. "))
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CC = $(CROSS)gcc
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AR = $(CROSS)ar
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AS = $(CROSS)as
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LD = $(CROSS)ld
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NM = $(CROSS)nm
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STRIP = $(CROSS)strip
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ELF2FLT = $(CROSS)elf2flt
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CPP = $(CC) -E
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SED ?= sed
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BZIP2 ?= bzip2
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# What OS are you compiling busybox for? This allows you to include
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# OS specific things, syscall overrides, etc.
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TARGET_OS=linux
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# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
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LC_ALL:= C
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# If you want to add some simple compiler switches (like -march=i686),
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# especially from the command line, use this instead of CFLAGS directly.
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# For optimization overrides, it's better still to set OPTIMIZATION.
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CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
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# To compile vs some other alternative libc, you may need to use/adjust
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# the following lines to meet your needs...
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#
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# If you are using Red Hat 6.x with the compatible RPMs (for developing under
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# Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
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# using the compatible RPMs (compat-*) at http://www.redhat.com !
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#LIBCDIR:=/usr/i386-glibc20-linux
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#
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# For other libraries, you are on your own. But these may (or may not) help...
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#LDFLAGS+=-nostdlib
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#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
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#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
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#GCCINCDIR:=$(shell gcc -print-search-dirs | $(SED) -ne "s/install: \(.*\)/\1include/gp")
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# This must bind late because srcdir is reset for every source subdirectory.
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INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
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CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
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CFLAGS+=$(CHECKED_CFLAGS)
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ARFLAGS=cru
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# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
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# get the CC MAJOR/MINOR version
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CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
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CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
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#--------------------------------------------------------
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export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
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ifeq ($(strip $(TARGET_ARCH)),)
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TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
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-e 's/i.86/i386/' \
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-e 's/sparc.*/sparc/' \
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-e 's/arm.*/arm/g' \
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-e 's/m68k.*/m68k/' \
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-e 's/ppc/powerpc/g' \
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-e 's/v850.*/v850/g' \
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-e 's/sh[234]/sh/' \
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-e 's/mips-.*/mips/' \
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-e 's/mipsel-.*/mipsel/' \
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-e 's/cris.*/cris/' \
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)
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endif
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# A nifty macro to make testing gcc features easier, but note that everything
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# that uses this _must_ use := or it will be re-evaluated everytime it is
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# referenced.
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ifeq ($(strip $(V)),2)
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VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
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endif
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check_cc=$(shell \
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$(VERBOSE_CHECK_CC) \
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if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
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echo "int i;" > ./conftest.c; \
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if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
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then echo "$(2)"; else echo "$(3)"; fi ; \
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rm -f conftest.c conftest.o; \
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fi)
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# A not very robust macro to check for available ld flags
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ifeq ($(strip $(V)),2)
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VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
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endif
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check_ld=$(shell \
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$(VERBOSE_CHECK_LD) \
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if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
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$(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
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echo "-Wl,$(2)" ; \
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fi)
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# A not very robust macro to check for available strip flags
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ifeq ($(strip $(V)),2)
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VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
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endif
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check_strip=$(shell \
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$(VERBOSE_CHECK_STRIP) \
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if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
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echo "int i;" > ./conftest.c ; \
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$(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
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$(1) $(2) conftest.o > /dev/null 2>&1 && \
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echo "$(1) $(2)" || echo "$(3)"; \
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rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
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fi)
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# Select the compiler needed to build binaries for your development system
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HOSTCC = gcc
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HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
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HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
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HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
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HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
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LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
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$(CC) -c -o conftest.o conftest.c ; \
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echo "int main(void){return 0;}" > conftest_main.c ; \
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$(CC) -c -o conftest_main.o conftest_main.c ; \
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$(AR) $(ARFLAGS) conftest.a conftest.o ; \
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$(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
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conftest_main.o -o conftest > /dev/null 2>&1 \
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&& echo "-Wl,--whole-archive" ; \
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rm conftest_main.o conftest_main.c conftest.o conftest.c \
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conftest.a conftest > /dev/null 2>&1 ; )
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ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
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LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
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endif
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LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
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$(CC) -c -o conftest.o conftest.c ; \
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echo "int main(void){return bar();}" > conftest_main.c ; \
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$(CC) -c -o conftest_main.o conftest_main.c ; \
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$(AR) $(ARFLAGS) conftest.a conftest.o ; \
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$(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
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-o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
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echo rm conftest_main.o conftest_main.c conftest.o conftest.c \
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conftest.a conftest > /dev/null 2>&1 ; )
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ifneq ($(findstring start-group,$(LD_START_GROUP)),)
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LD_END_GROUP:= -Wl,--end-group
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endif
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CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
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# Pin CHECKED_CFLAGS with := so it's only evaluated once.
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CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
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# Preemptively pin this too.
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PROG_CFLAGS:=
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#--------------------------------------------------------
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# Arch specific compiler optimization stuff should go here.
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# Unless you want to override the defaults, do not set anything
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# for OPTIMIZATION...
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# use '-Os' optimization if available, else use -O2
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OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
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ifeq ($(CONFIG_BUILD_AT_ONCE),y)
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# gcc 2.95 exits with 0 for "unrecognized option"
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ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
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CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
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endif
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OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
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OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
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ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
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# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
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# This prevents us from using -fwhole-program when we build the lib
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PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
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endif # CONFIG_BUILD_LIBBUSYBOX
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endif # CONFIG_BUILD_AT_ONCE
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LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
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#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
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#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
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#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
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# Some nice architecture specific optimizations
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ifeq ($(strip $(TARGET_ARCH)),arm)
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OPTIMIZATION+=-fstrict-aliasing
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endif
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ifeq ($(strip $(TARGET_ARCH)),i386)
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OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
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# gcc-4.0 and older seem to benefit from these
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#ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
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OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
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OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
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-malign-functions=0 -malign-jumps=0 -malign-loops=0)
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#endif # gcc-4.0 and older
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# gcc-4.1 and beyond seem to benefit from these
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ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
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# turn off flags which hurt -Os
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OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
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OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
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OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
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OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
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endif # gcc-4.1 and beyond
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endif
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OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
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#
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#--------------------------------------------------------
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# If you're going to do a lot of builds with a non-vanilla configuration,
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# it makes sense to adjust parameters above, so you can type "make"
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# by itself, instead of following it by the same half-dozen overrides
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# every time. The stuff below, on the other hand, is probably less
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# prone to casual user adjustment.
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#
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ifeq ($(strip $(CONFIG_LFS)),y)
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# For large file summit support
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CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
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endif
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ifeq ($(strip $(CONFIG_DMALLOC)),y)
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# For testing mem leaks with dmalloc
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CFLAGS+=-DDMALLOC
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LIBRARIES:=-ldmalloc
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else
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ifeq ($(strip $(CONFIG_EFENCE)),y)
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LIBRARIES:=-lefence
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endif
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endif
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# Debugging info
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ifeq ($(strip $(CONFIG_DEBUG)),y)
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CFLAGS +=-g
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else
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CFLAGS +=-DNDEBUG
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CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
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endif
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ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
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CFLAGS += $(OPTIMIZATION)
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endif
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# warn a bit more verbosely for non-release versions
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ifneq ($(EXTRAVERSION),)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
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CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
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endif
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STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
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ifeq ($(strip $(CONFIG_STATIC)),y)
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PROG_CFLAGS += $(call check_cc,$(CC),-static,)
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endif
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CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
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LIB_CFLAGS+=$(CFLAGS_SHARED)
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ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
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CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
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LIB_CFLAGS+=$(CFLAGS_PIC)
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endif
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ifeq ($(strip $(CONFIG_SELINUX)),y)
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LIBRARIES += -lselinux
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endif
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ifeq ($(strip $(PREFIX)),)
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PREFIX:=`pwd`/_install
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endif
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#ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
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# CFLAGS += -D__need_getopt
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#endif
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# Additional complications due to support for pristine source dir.
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# Include files in the build directory should take precedence over
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# the copy in top_srcdir, both during the compilation phase and the
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# shell script that finds the list of object files.
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# Work in progress by <ldoolitt@recycle.lbl.gov>.
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OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
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CFLAGS += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
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LDFLAGS += $(CHECKED_LDFLAGS)
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ifdef BB_INIT_SCRIPT
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CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
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endif
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# Put user-supplied flags at the end, where they
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# have a chance of winning.
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CFLAGS += $(CFLAGS_EXTRA)
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#------------------------------------------------------------
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# Installation options
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
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INSTALL_OPTS=--hardlinks
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endif
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
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INSTALL_OPTS=--symlinks
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endif
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
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INSTALL_OPTS=
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endif
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#------------------------------------------------------------
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# Make the output nice and tight
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MAKEFLAGS += --no-print-directory
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export MAKE_IS_SILENT=n
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ifneq ($(findstring s,$(MAKEFLAGS)),)
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export MAKE_IS_SILENT=y
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SECHO := @-false
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DISP := sil
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Q := @
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else
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ifneq ($(V)$(VERBOSE),)
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SECHO := @-false
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DISP := ver
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Q :=
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else
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SECHO := @echo
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DISP := pur
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Q := @
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endif
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endif
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show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
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pur_disp_compile.c = echo " "CC $(show_objs)
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pur_disp_compile.h = echo " "HOSTCC $(show_objs)
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pur_disp_strip = echo " "STRIP $(show_objs)
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pur_disp_link = echo " "LINK $(show_objs)
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pur_disp_link.h = echo " "HOSTLINK $(show_objs)
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pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
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pur_disp_elf2flt = echo " "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
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sil_disp_compile.c = true
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sil_disp_compile.h = true
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sil_disp_strip = true
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sil_disp_link = true
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sil_disp_link.h = true
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sil_disp_ar = true
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sil_disp_elf2flt = true
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ver_disp_compile.c = echo $(cmd_compile.c)
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ver_disp_compile.h = echo $(cmd_compile.h)
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ver_disp_strip = echo $(cmd_strip)
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ver_disp_link = echo $(cmd_link)
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ver_disp_link.h = echo $(cmd_link.h)
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ver_disp_ar = echo $(cmd_ar)
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ver_disp_elf2flt = echo $(cmd_elf2flt)
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disp_compile.c = $($(DISP)_disp_compile.c)
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disp_compile.h = $($(DISP)_disp_compile.h)
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disp_strip = $($(DISP)_disp_strip)
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disp_link = $($(DISP)_disp_link)
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disp_link.h = $($(DISP)_disp_link.h)
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disp_ar = $($(DISP)_disp_ar)
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disp_gen = $(SECHO) " "GEN $@ ; true
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disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
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disp_elf2flt = $($(DISP)_disp_elf2flt)
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cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
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cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
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cmd_strip = $(STRIPCMD) $@
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cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
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cmd_link.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
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cmd_ar = $(AR) $(ARFLAGS) $@ $^
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cmd_elf2flt = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
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compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
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compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
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do_strip = @$(disp_strip) ; $(cmd_strip)
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do_link = @$(disp_link) ; $(cmd_link)
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do_link.h = @$(disp_link.h) ; $(cmd_link.h)
|
|
do_ar = @$(disp_ar) ; $(cmd_ar)
|
|
do_elf2flt = @$(disp_elf2flt) ; $(cmd_elf2flt)
|
|
|
|
uppercase = $(shell echo $1 | tr '[:lower:]' '[:upper:]')
|
|
%.a:
|
|
@if test -z "$($(call uppercase,$*)_DIR)" ; then \
|
|
echo "Invalid target $@" ; \
|
|
exit 1 ; \
|
|
fi
|
|
$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
|
|
|
|
.PHONY: dummy
|