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Rules.mak
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# Rules.make for uClibc
#
# Copyright (C) 2000-2008 Erik Andersen <[email protected]>
#
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#
# make nano-doc
# FOO = bar -- recursively expanded variable. Value is remebered verbatim.
# If it contains references to other variables, these references
# are expanded whenever this variable is _substituted_.
# FOO := bar -- simply expanded variable. Right hand is expanded when
# the variable is _defined_. Therefore faster than =.
# FOO ?= bar -- set a value only if it is not already set
# (behaves as =, not :=).
# FOO += bar -- append; if FOO is not defined, acts like = (not :=).
# check for proper make version
ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
endif
#-----------------------------------------------------------
# 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_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.
#
# Most people will set this stuff on the command line, i.e.
# make CROSS_COMPILE=arm-linux-
# will build uClibc for 'arm'.
# CROSS is still supported for backward compatibily only
CROSS_COMPILE ?= $(CROSS)
CC = $(CROSS_COMPILE)gcc
AR = $(CROSS_COMPILE)ar
LD = $(CROSS_COMPILE)ld
NM = $(CROSS_COMPILE)nm
OBJDUMP = $(CROSS_COMPILE)objdump
STRIPTOOL = $(CROSS_COMPILE)strip
INSTALL = install
LN = ln
RM = rm -f
TAR = tar
SED = sed
AWK = awk
STRIP_FLAGS ?= -x -R .note -R .comment
## unused? if yes, remove after 0.9.31
## UNIFDEF := $(top_builddir)extra/scripts/unifdef
# Select the compiler needed to build binaries for your development system
HOSTCC = gcc
BUILD_CFLAGS = -Os -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.
# strip quotes
qstrip = $(strip $(subst ",,$(1)))
#"))
ifndef KCONFIG_CONFIG
KCONFIG_CONFIG := $(top_builddir).config
endif
export KCONFIG_CONFIG
# Pull in the user's uClibc configuration
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
# Prevent make from searching
__ABS_KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
-include $(__ABS_KCONFIG_CONFIG)
endif
TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
ifeq ($(TARGET_ARCH),)
ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
-e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
-e s/sh.*/sh/ \
-e s/s390x/s390/ -e s/parisc.*/hppa/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/xtensa.*/xtensa/ )
else
ARCH = $(TARGET_ARCH)
endif
export ARCH
# Make certain these contain a final "/", but no "//"s.
scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
# Now config hard core
MAJOR_VERSION := 0
MINOR_VERSION := 9
SUBLEVEL := 34
EXTRAVERSION :=-git
VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
ABI_VERSION := $(MAJOR_VERSION)
ifneq ($(EXTRAVERSION),)
VERSION := $(VERSION)$(EXTRAVERSION)
endif
# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
LC_ALL := C
export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
LIBC := libc
SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
UCLIBC_LDSO_NAME := ld64-uClibc
ARCH_NATIVE_BIT := 64
else
UCLIBC_LDSO_NAME := ld-uClibc
ARCH_NATIVE_BIT := 32
endif
UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
NONSHARED_LIBNAME := uclibc_nonshared.a
libc := $(top_builddir)lib/$(SHARED_LIBNAME)
libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
ifneq ($(ARCH_HAS_NO_SHARED),y)
libdl.depend := $(top_builddir)lib/libdl.so
endif
ifneq ($(HAS_NO_THREADS),y)
libpthread.depend := $(top_builddir)lib/libpthread.so
endif
interp := $(top_builddir)lib/interp.os
ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
headers_dep := $(top_builddir)include/bits/sysnum.h
sub_headers := $(headers_dep)
#LIBS :=$(interp) -L$(top_builddir)lib -lc
LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
# Make sure DESTDIR and PREFIX can be used to install
# PREFIX is a uClibcism while DESTDIR is a common GNUism
ifndef PREFIX
PREFIX = $(DESTDIR)
endif
ifneq ($(HAVE_SHARED),y)
libc :=
interp :=
ldso :=
endif
comma:=,
space:= #
ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
endif
# A nifty macro to make testing gcc features easier
check_gcc=$(shell \
if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
then echo "$(1)"; else echo "$(2)"; fi)
check_as=$(shell \
if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
then echo "-Wa,$(1)"; fi)
check_ld=$(shell \
if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
then echo "$(1)"; fi)
# Use variable indirection here so that we can have variable
# names with fun chars in them like equal signs
define check-tool-var
ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
_v = $(2)_$(3)
ifndef $$(_v)
$$(_v) := $$(call $(1),$(subst %, ,$(3)))
export $$(_v)
endif
endif
endef
# Usage: check-gcc-var,<flag>
# Check the C compiler to see if it supports <flag>.
# Export the variable CFLAG_<flag> if it does.
define check-gcc-var
$(call check-tool-var,check_gcc,CFLAG,$(1))
endef
# Usage: check-as-var,<flag>
# Check the assembler to see if it supports <flag>. Export the
# variable ASFLAG_<flag> if it does (for invoking the assembler),
# as well CFLAG_-Wa<flag> (for invoking the compiler driver).
define check-as-var
$(call check-tool-var,check_as,ASFLAG,$(1))
_v = CFLAG_-Wa$(1)
export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
endef
# Usage: check-ld-var,<flag>
# Check the linker to see if it supports <flag>. Export the
# variable LDFLAG_<flag> if it does (for invoking the linker),
# as well CFLAG_-Wl<flag> (for invoking the compiler driver).
define check-ld-var
$(call check-tool-var,check_ld,LDFLAG,$(1))
_v = CFLAG_-Wl$(1)
export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
endef
# Usage: cache-output-var,<variable>,<shell command>
# Execute <shell command> and cache the output in <variable>.
define cache-output-var
ifndef $(1)
$(1) := $$(shell $(2))
export $(1)
endif
endef
ARFLAGS:=cr
# Flags in OPTIMIZATION are used only for non-debug builds
OPTIMIZATION:=
# Use '-Os' optimization if available, else use -O2, allow Config to override
$(eval $(call check-gcc-var,-Os))
ifneq ($(CFLAG_-Os),)
OPTIMIZATION += $(CFLAG_-Os)
else
$(eval $(call check-gcc-var,-O2))
OPTIMIZATION += $(CFLAG_-O2)
endif
# Use the gcc 3.4 -funit-at-a-time optimization when available
$(eval $(call check-gcc-var,-funit-at-a-time))
OPTIMIZATION += $(CFLAG_-funit-at-a-time)
# shrinks code by about 0.1%
$(eval $(call check-gcc-var,-fmerge-all-constants))
$(eval $(call check-gcc-var,-fstrict-aliasing))
OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
$(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
GCC_VER := $(subst ., ,$(GCC_VER))
GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
#GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
ifeq ($(GCC_MAJOR_VER),4)
# shrinks code, results are from 4.0.2
# 0.36%
$(eval $(call check-gcc-var,-fno-tree-loop-optimize))
OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
# 0.34%
$(eval $(call check-gcc-var,-fno-tree-dominator-opts))
OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
# 0.1%
$(eval $(call check-gcc-var,-fno-strength-reduce))
OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
endif
# CPU_CFLAGS-y contain options which are not warnings,
# not include or library paths, and not optimizations.
# Why -funsigned-char: I hunted a bug related to incorrect
# sign extension of 'char' type for 10 hours straight. Not fun.
CPU_CFLAGS-y := -funsigned-char -fno-builtin
$(eval $(call check-gcc-var,-fno-asm))
CPU_CFLAGS-y += $(CFLAG_-fno-asm)
LDADD_LIBFLOAT=
ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
# If -msoft-float isn't supported, we want an error anyway.
# Hmm... might need to revisit this for arm since it has 2 different
# soft float encodings.
ifneq ($(TARGET_ARCH),nios)
ifneq ($(TARGET_ARCH),nios2)
ifneq ($(TARGET_ARCH),sh)
ifneq ($(TARGET_ARCH),c6x)
CPU_CFLAGS-y += -msoft-float
endif
endif
endif
endif
ifeq ($(TARGET_ARCH),arm)
# No longer needed with current toolchains, but leave it here for now.
# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
# LDADD_LIBFLOAT=-lfloat
endif
endif
$(eval $(call check-gcc-var,-std=gnu99))
CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
PICFLAG-y := -fPIC
PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
PICFLAG := $(PICFLAG-y)
PIEFLAG_NAME:=-fPIE
# Some nice CPU specific optimizations
ifeq ($(TARGET_ARCH),i386)
$(eval $(call check-gcc-var,-fomit-frame-pointer))
OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
# Non-SSE capable processor.
# NB: this may make SSE insns segfault!
# -O1 -march=pentium3, -Os -msse etc are known to be affected.
# See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
# -m32 is needed if host is 64-bit
OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
else
$(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
endif
# Choice of alignment (please document why!)
# -falign-labels: in-line labels
# (reachable by normal code flow, aligning will insert nops
# which will be executed - may even make things slower)
# -falign-jumps: reachable only by a jump
# Generic: no alignment at all (smallest code)
GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
ifeq ($(CONFIG_K7),y)
# Align functions to four bytes, use default for jumps and loops (why?)
GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
endif
ifeq ($(CONFIG_CRUSOE),y)
# Use compiler's default for functions, jumps and loops (why?)
GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
endif
ifeq ($(CONFIG_CYRIXIII),y)
# Use compiler's default for functions, jumps and loops (why?)
GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
endif
OPTIMIZATION+=$(GCC_FALIGN)
# Putting each function and data object into its own section
# allows for kbytes of less text if users link against static uclibc
# using ld --gc-sections.
# ld 2.18 can't do that (yet?) for shared libraries, so we itself
# do not use --gc-sections at shared lib link time.
# However, in combination with sections being sorted by alignment
# it does result in much reduced padding:
# text data bss dec hex
# 235319 1472 5992 242783 3b45f old.so
# 234104 1472 5980 241556 3af94 new.so
# Without -ffunction-sections, all functions will get aligned
# to 4 byte boundary by as/ld. This is arguably a bug in as.
# It specifies 4 byte align for .text even if not told to do so:
# Idx Name Size VMA LMA File off Algn
# 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
$(eval $(call check-ld-var,--sort-section=alignment))
CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
CPU_LDFLAGS-y+=-m32
CPU_CFLAGS-y+=-m32
CPU_CFLAGS-$(CONFIG_386)+=-march=i386
CPU_CFLAGS-$(CONFIG_486)+=-march=i486
CPU_CFLAGS-$(CONFIG_ELAN)+=-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-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-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,-march=i686)
CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
CPU_CFLAGS-$(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)+=$(call check_gcc,-march=c3,-march=i486)
CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
endif
ifeq ($(TARGET_ARCH),sparc)
CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
endif
ifeq ($(TARGET_ARCH),arm)
CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
endif
ifeq ($(TARGET_ARCH),metag)
SYMBOL_PREFIX=_
CPU_CFLAGS-$(CONFIG_META_1_2)+=
CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
endif
ifeq ($(TARGET_ARCH),mips)
OPTIMIZATION+=-mno-split-addresses
CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
endif
ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
endif
CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
endif
ifeq ($(TARGET_ARCH),nios)
OPTIMIZATION+=-funaligned-struct-hack
CPU_LDFLAGS-y+=-Wl,-m32
CPU_CFLAGS-y+=-Wl,-m32
endif
ifeq ($(TARGET_ARCH),sh)
$(eval $(call check-gcc-var,-mprefergot))
OPTIMIZATION += $(CFLAG_-mprefergot)
CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
CPU_CFLAGS-$(CONFIG_SH2)+=-m2
CPU_CFLAGS-$(CONFIG_SH3)+=-m3
ifeq ($(UCLIBC_HAS_FPU),y)
CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
CPU_CFLAGS-$(CONFIG_SH4)+=-m4
else
CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
endif
endif
ifeq ($(TARGET_ARCH),sh64)
CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
endif
ifeq ($(TARGET_ARCH),h8300)
SYMBOL_PREFIX=_
CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
endif
ifeq ($(TARGET_ARCH),i960)
OPTIMIZATION+=-mh -mint32 #-fsigned-char
endif
ifeq ($(TARGET_ARCH),e1)
OPTIMIZATION+=-mgnu-param
endif
ifeq ($(TARGET_ARCH),cris)
CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
PICFLAG:=-fpic
PIEFLAG_NAME:=-fpie
endif
ifeq ($(TARGET_ARCH),m68k)
# -fPIC is only supported for 68020 and above. It is not supported
# for 68000, 68010, or Coldfire.
PICFLAG:=-fpic
PIEFLAG_NAME:=-fpie
endif
ifeq ($(TARGET_ARCH),powerpc)
# PowerPC can hold 8192 entries in its GOT with -fpic which is more than
# enough. Therefore use -fpic which will reduce code size and generates
# faster code.
PICFLAG:=-fpic
PIEFLAG_NAME:=-fpie
PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
endif
ifeq ($(TARGET_ARCH),bfin)
SYMBOL_PREFIX=_
ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
CPU_CFLAGS-y:=-mfdpic
CPU_LDFLAGS-y += -Wl,-melf32bfinfd
PICFLAG:=-fpic
PIEFLAG_NAME:=-fpie
endif
ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
PICFLAG := -mleaf-id-shared-library
endif
endif
ifeq ($(TARGET_ARCH),frv)
CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
# Using -pie causes the program to have an interpreter, which is
# forbidden, so we must make do with -shared. Unfortunately,
# -shared by itself would get us global function descriptors
# and calls through PLTs, dynamic resolution of symbols, etc,
# which would break as well, but -Bsymbolic comes to the rescue.
export LDPIEFLAG:=-shared -Wl,-Bsymbolic
UCLIBC_LDSO=ld.so.1
endif
ifeq ($(strip $(TARGET_ARCH)),avr32)
CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
endif
ifeq ($(TARGET_ARCH),i960)
SYMBOL_PREFIX=_
endif
ifeq ($(TARGET_ARCH),v850)
SYMBOL_PREFIX=_
endif
ifeq ($(TARGET_ARCH),c6x)
PIEFLAG:=
CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
CPU_LDFLAGS-y += $(CPU_CFLAGS)
endif
$(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
ifeq ($(PIEFLAG),)
PIEFLAG := $(PICFLAG)
endif
# We need to keep track of both the CC PIE flag (above) as
# well as the LD PIE flag (below) because we can't rely on
# gcc passing -pie if we used -fPIE. We need to directly use -pie
# instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
$(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
# Check for --as-needed support in linker
ifndef LD_FLAG_ASNEEDED
_LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
ifneq ($(_LD_FLAG_ASNEEDED),)
export LD_FLAG_ASNEEDED:=--as-needed
endif
endif
ifndef LD_FLAG_NO_ASNEEDED
ifdef LD_FLAG_ASNEEDED
export LD_FLAG_NO_ASNEEDED:=--no-as-needed
endif
endif
ifndef CC_FLAG_ASNEEDED
ifdef LD_FLAG_ASNEEDED
export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
endif
endif
ifndef CC_FLAG_NO_ASNEEDED
ifdef LD_FLAG_NO_ASNEEDED
export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
endif
endif
link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
# Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
ifndef ASNEEDED
export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
# Only used in installed libc.so linker script
ifeq ($(UCLIBC_HAS_BACKTRACE),y)
ifeq ($(HARDWIRED_ABSPATH),y)
UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
else
UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
endif
export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && \
echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
else
export UBACKTRACE_ASNEEDED:=""
endif
endif
# Add a bunch of extra pedantic annoyingly strict checks
WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
ifeq ($(EXTRA_WARNINGS),y)
WARNING_FLAGS += \
-Wformat=2 \
-Wmissing-noreturn \
-Wmissing-format-attribute \
-Wmissing-prototypes \
-Wmissing-declarations \
-Wnested-externs \
-Wnonnull \
-Wold-style-declaration \
-Wold-style-definition \
-Wshadow \
-Wundef
# Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
endif
WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
$(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
# Save the tested flag in a single variable and force it to be
# evaluated just once. Then use that computed value.
$(eval $(call check-gcc-var,-fno-stack-protector))
SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
ifeq ($(UCLIBC_BUILD_SSP),y)
$(eval $(call check-gcc-var,-fno-stack-protector-all))
$(eval $(call check-gcc-var,-fstack-protector))
$(eval $(call check-gcc-var,-fstack-protector-all))
SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
SSP_CFLAGS += $(CFLAG_-fstack-protector)
SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
else
SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
endif
$(eval $(call check-gcc-var,-nostdlib))
# Collect all CFLAGS components
CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
-nostdinc -I$(top_builddir)include \
-I$(top_srcdir)include -include libc-symbols.h \
-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
-I$(top_srcdir)libc/sysdeps/linux \
-I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
-I$(top_srcdir)ldso/include -I.
ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
endif
# We need this to be checked within libc-symbols.h
ifneq ($(HAVE_SHARED),y)
CFLAGS += -DSTATIC
endif
$(eval $(call check-ld-var,--warn-once))
$(eval $(call check-ld-var,--sort-common))
$(eval $(call check-ld-var,--discard-all))
LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
-Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
# binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
#$(eval $(call check-ld-var,--gc-sections))
#LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
$(eval $(call check-gcc-var,-fdata-sections))
$(eval $(call check-gcc-var,-ffunction-sections))
ifeq ($(UCLIBC_BUILD_RELRO),y)
LDFLAGS_NOSTRIP+=-Wl,-z,relro
endif
ifeq ($(UCLIBC_BUILD_NOW),y)
LDFLAGS_NOSTRIP+=-Wl,-z,now
endif
ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
# Be sure that binutils support it
$(eval $(call check-ld-var,--hash-style=gnu))
ifeq ($(LDFLAG_--hash-style=gnu),)
ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
$(error Your binutils do not support --hash-style option, while you want to use it)
endif
else
LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
endif
endif
LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
ifeq ($(DODEBUG),y)
CFLAGS += -O0 -g3 -DDEBUG
else
CFLAGS += $(OPTIMIZATION)
endif
ifeq ($(DOSTRIP),y)
LDFLAGS += -Wl,-s
else
STRIPTOOL := true -Stripping_disabled
endif
ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
endif
ifeq ($(DOMULTI),y)
# we try to compile all sources at once into an object (IMA), but
# gcc-3.3.x does not support it
# gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
# gcc-4.0.x supports it, supports the --combine flag, but does not need it
# gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
ifeq ($(GCC_MAJOR_VER),3)
DOMULTI:=n
else
$(eval $(call check-gcc-var,--combine))
CFLAGS += $(CFLAG_--combine)
endif
else
DOMULTI:=n
endif
ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
endif
ifeq ($(UCLIBC_HAS_THREADS),y)
ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
PTNAME := nptl
CFLAGS += -DHAVE_FORCED_UNWIND
else
ifeq ($(LINUXTHREADS_OLD),y)
PTNAME := linuxthreads.old
else
PTNAME := linuxthreads
endif
endif
PTDIR := libpthread/$(PTNAME)
# set up system dependencies include dirs (NOTE: order matters!)
ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
PTINC:= -I$(top_builddir)$(PTDIR) \
-I$(top_srcdir)$(PTDIR) \
$(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
-I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
-I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
-I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
-I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
-I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
-I$(top_srcdir)$(PTDIR)/sysdeps/generic
#
# Test for TLS if NPTL support was selected.
#
GCC_HAS_TLS=$(shell \
echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
ifneq ($(GCC_HAS_TLS),)
gcc_tls_test_fail:
@echo "####";
@echo "#### Your compiler does not support TLS and you are trying to build uClibc";
@echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
@echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
@echo "#### about this problem.";
@echo "####";
@echo "#### Exiting...";
@echo "####";
@exit 1;
endif
else
PTINC := \
-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
-I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
-I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
-I$(top_srcdir)$(PTDIR) \
-I$(top_srcdir)libpthread
endif
CFLAGS+=$(PTINC)
else
PTNAME :=
PTINC :=
endif
CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
#CFLAGS += -iwithprefix include-fixed -iwithprefix include
$(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
CFLAGS += $(CC_INC)
CFLAGS += -I$(KERNEL_HEADERS)
ifneq ($(DOASSERTS),y)
CFLAGS+=-DNDEBUG
endif
ifeq ($(SYMBOL_PREFIX),_)
CFLAGS+=-D__UCLIBC_UNDERSCORES__
endif
# Keep the check_as from being needlessly executed
ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
$(eval $(call check-as-var,--noexecstack))
endif
ASFLAGS = $(ASFLAG_--noexecstack)
LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
$(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
$(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
# with -O0 we (e.g. lockf) might end up with references to
# _Unwind_Resume, so pull in gcc_eh in this case..
LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
LIBGCC_DIR:=$(dir $(LIBGCC))
# moved from libpthread/linuxthreads
ifeq ($(UCLIBC_CTOR_DTOR),y)
SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
endif
LOCAL_INSTALL_PATH := install_dir
PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"