uclibc-ng/Rules.mak

# Rules.make for uClibc
#
# Copyright (C) 2000 by Lineo, inc.
# Copyright (C) 2000-2002 Erik Andersen <andersen@uclibc.org>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU Library 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 Library General Public License for more
# details.
#
# You should have received a copy of the GNU Library 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


#--------------------------------------------------------
# This file contains rules which are shared between multiple Makefiles.
# All normal configuration options live in the file named ".config".
# Don't mess with this file unless you know what you are doing.


#--------------------------------------------------------
# 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
#
# Most people will set this stuff on the command line, i.e.
#        make CROSS=mipsel-linux-
# will build uClibc for 'mipsel'.

ifndef CROSS
CROSS=
endif
CC= $(CROSS)gcc
AR= $(CROSS)ar
LD= $(CROSS)ld
NM= $(CROSS)nm
STRIPTOOL= $(CROSS)strip

# Select the compiler needed to build binaries for your development system
HOSTCC=gcc
HOSTCFLAGS=-O2 -Wall


#--------------------------------------------------------
# Nothing beyond this point should ever be touched by mere mortals.  
# Unless you hang out with the gods, you should probably leave all
# this stuff alone.
MAJOR_VERSION:=0
MINOR_VERSION:=9
SUBLEVEL:=18
VERSION:=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc. 
LC_ALL:= C
export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL

SHARED_FULLNAME:=libuClibc-$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL).so
SHARED_MAJORNAME:=libc.so.$(MAJOR_VERSION)
UCLIBC_LDSO:=ld-uClibc.so.$(MAJOR_VERSION)
LIBNAME:=libc.a
LIBC:=$(TOPDIR)libc/$(LIBNAME)

# Pull in the user's uClibc configuration
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
-include $(TOPDIR).config
endif

# 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)

# check if we have nawk, otherwise user awk
AWK:=$(shell if [ -x /usr/bin/nawk ]; then echo "/usr/bin/nawk"; \
	else echo "/usr/bin/awk"; fi)

HOST_ARCH:= $(shell uname -m | sed \
		-e 's/i.86/i386/' \
		-e 's/sparc.*/sparc/' \
		-e 's/arm.*/arm/g' \
		-e 's/m68k.*/m68k/' \
		-e 's/ppc/powerpc/g' \
		-e 's/v850.*/v850/g' \
		-e 's/sh[234].*/sh/' \
		-e 's/mips.*/mips/' \
		)
ifeq ($(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
export TARGET_ARCH

ARFLAGS:=r

OPTIMIZATION:=
# Some nice CPU specific optimizations
ifeq ($(strip $(TARGET_ARCH)),i386)
	OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
	OPTIMIZATION+=$(call check_gcc,-falign-jumps=0 -falign-loops=0,-malign-jumps=0 -malign-loops=0)
	CPU_CFLAGS-$(CONFIG_386):="-march=i386"
	CPU_CFLAGS-$(CONFIG_486):="-march=i486"
	CPU_CFLAGS-$(CONFIG_586):="-march=i586"
	CPU_CFLAGS-$(CONFIG_586MMX):="$(call check_gcc,-march=pentium-mmx,-march=i586)"
	CPU_CFLAGS-$(CONFIG_686):="-march=i686"
	CPU_CFLAGS-$(CONFIG_PENTIUMIII):="$(call check_gcc,-march=pentium3,-march=i686)"
	CPU_CFLAGS-$(CONFIG_PENTIUM4):="$(call check_gcc,-march=pentium4,-march=i686)"
	CPU_CFLAGS-$(CONFIG_K6):="$(call check_gcc,-march=k6,-march=i586)"
	CPU_CFLAGS-$(CONFIG_K7):="$(call check_gcc,-march=athlon,-malign-functions=4 -march=i686)"
	CPU_CFLAGS-$(CONFIG_CRUSOE):="-march=i686 -malign-functions=0 -malign-jumps=0 -malign-loops=0"
	CPU_CFLAGS-$(CONFIG_WINCHIPC6):="$(call check_gcc,-march=winchip-c6,-march=i586)"
	CPU_CFLAGS-$(CONFIG_WINCHIP2):="$(call check_gcc,-march=winchip2,-march=i586)"
	CPU_CFLAGS-$(CONFIG_CYRIXIII):="$(call check_gcc,-march=c3,-march=i586)"
endif

ifeq ($(strip $(TARGET_ARCH)),arm)
	OPTIMIZATION+=-fstrict-aliasing
	CPU_CFLAGS-$(CONFIG_GENERIC_ARM):=
	CPU_CFLAGS-$(CONFIG_ARM7TDMI):="-march=arm7tdmi"
	CPU_CFLAGS-$(CONFIG_STRONGARM):="-march=strongarm"
	CPU_CFLAGS-$(CONFIG_XSCALE):="-march=xscale"
endif

ifeq ($(strip $(TARGET_ARCH)),sh)
	OPTIMIZATION+=-fstrict-aliasing
	OPTIMIZATION+= $(call check_gcc,-mprefergot,)
	CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):="-EL"
	CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):="-EB"
	CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):="-ml"
	CPU_CFLAGS-$(ARCH_BIG_ENDIAN):="-mb"
	CPU_CFLAGS-$(CONFIG_SH2)+="-m2"
	CPU_CFLAGS-$(CONFIG_SH3)+="-m3"
	CPU_CFLAGS-$(CONFIG_SH4)+="-m4"
	CPU_CFLAGS-$(CONFIG_SH5)+="-m5"
endif

ifeq ($(strip $(TARGET_ARCH)),h8300)
	CPU_LDFLAGS-y:=-mh8300h
	CPU_CFLAGS-y+=-mh -mint32 -fsigned-char
endif

ifeq ($(strip $(TARGET_ARCH)),cris)
	CPU_LDFLAGS-$(CONFIG_CRIS):="-mcrislinux"
	CPU_CFLAGS-$(CONFIG_CRIS):="-mlinux"
endif

# use '-Os' optimization if available, else use -O2, allow Config to override
OPTIMIZATION+=$(call check_gcc,-Os,-O2)


# Add a bunch of extra pedantic annoyingly strict checks
XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
# Some nice CFLAGS to work with
CFLAGS:=$(XWARNINGS) $(OPTIMIZATION) $(XARCH_CFLAGS) $(CPU_CFLAGS) \
	-fno-builtin -nostdinc -D_LIBC -I$(TOPDIR)include -I.

ifeq ($(DODEBUG),y)
    CFLAGS += -g
    LDFLAGS:= $(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
    STRIPTOOL:= true -Since_we_are_debugging
else
    LDFLAGS := $(CPU_LDFLAGS-y) -s -shared --warn-common --warn-once -z combreloc
endif

# Sigh, some stupid versions of gcc can't seem to cope with '-iwithprefix include'
#CFLAGS+=-iwithprefix include
CFLAGS+=$(shell $(CC) -print-search-dirs | sed -ne "s/install: *\(.*\)/-I\1include/gp")

ifneq ($(DOASSERTS),y)
    CFLAGS += -DNDEBUG
endif

ifeq ($(HAVE_SHARED),y)
    LIBRARY_CACHE:=#-DUSE_CACHE
    ifeq ($(BUILD_UCLIBC_LDSO),y)
	LDSO:=$(TOPDIR)lib/$(UCLIBC_LDSO)
	DYNAMIC_LINKER:=$(SHARED_LIB_LOADER_PATH)/$(UCLIBC_LDSO)
	BUILD_DYNAMIC_LINKER:=$(shell cd $(TOPDIR) && pwd)/lib/$(UCLIBC_LDSO)
    else
	LDSO:=$(SYSTEM_LDSO)
	DYNAMIC_LINKER:=/lib/$(strip $(subst ",, $(notdir $(SYSTEM_LDSO))))
	BUILD_DYNAMIC_LINKER:=/lib/$(strip $(subst ",, $(notdir $(SYSTEM_LDSO))))
   endif
endif
ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
    CFLAGS += $(call check_gcc,-msoft-float,)
endif

CFLAGS_NOPIC:=$(CFLAGS)
ifeq ($(DOPIC),y)
ifeq ($(strip $(TARGET_ARCH)),cris)
	CFLAGS += -fpic -mlinux
else
    CFLAGS += -fPIC
endif
endif

LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
LIBGCC_DIR:=$(dir $(LIBGCC))

# TARGET_PREFIX is the directory under which which the uClibc runtime
# environment will be installed and used on the target system.   The 
# result will look something like the following:
#   TARGET_PREFIX/
#	lib/            <contains all runtime and static libs>
#	usr/lib/        <this directory is searched for runtime libs>
#	etc/            <weher the shared library cache and configuration 
#	                information go if you enabled LIBRARY_CACHE above>
# Very few people will need to change this value from the default...
TARGET_PREFIX = /

########################################
#
# uClinux shared lib support
#

ifdef CONFIG_BINFMT_SHARED_FLAT
  # For the shared version of this, we specify no stack and its library ID
  FLTFLAGS += -s 0
  LIBID=1
  export LIBID FLTFLAGS
  SHARED_TARGET = lib/libc
endif