Rules.mak

   1 # Rules.mak for uClibc
   2 #
   3 # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
   4 #
   5 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6 #
   7
   8 # make nano-doc
   9 # FOO = bar  -- recursively expanded variable. Value is remebered verbatim.
  10 #               If it contains references to other variables, these references
  11 #               are expanded whenever this variable is _substituted_.
  12 # FOO := bar -- simply expanded variable. Right hand is expanded when
  13 #               the variable is _defined_. Therefore faster than =.
  14 # FOO ?= bar -- set a value only if it is not already set
  15 #               (behaves as =, not :=).
  16 # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  17
  18
  19 # check for proper make version
  20 ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  21 $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  22 endif
  23
  24 #-----------------------------------------------------------
  25 # This file contains rules which are shared between multiple
  26 # Makefiles.  All normal configuration options live in the
  27 # file named ".config".  Don't mess with this file unless
  28 # you know what you are doing.
  29
  30 clean_targets := clean realclean distclean \
  31         objclean-y headers_clean-y CLEAN_utils
  32 noconfig_targets := menuconfig config nconfig \
  33         oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
  34         alldefconfig randconfig defconfig savedefconfig listnewconfig \
  35         olddefconfig \
  36         xconfig gconfig update-po-config mconf qconf gconf nconf conf \
  37         release dist tags help
  38
  39
  40 #-----------------------------------------------------------
  41 # If you are running a cross compiler, you will want to set
  42 # 'CROSS_COMPILE' to something more interesting ...  Target
  43 # architecture is determined by asking the CC compiler what
  44 # arch it compiles things for, so unless your compiler is
  45 # broken, you should not need to specify TARGET_ARCH.
  46 #
  47 # Most people will set this stuff on the command line, i.e.
  48 #        make CROSS_COMPILE=arm-linux-
  49 # will build uClibc for 'arm'.
  50 # CROSS is still supported for backward compatibily only
  51
  52 CROSS_COMPILE ?= $(CROSS)
  53
  54 CC         = $(CROSS_COMPILE)gcc
  55 AR         = $(CROSS_COMPILE)ar
  56 LD         = $(CROSS_COMPILE)ld
  57 NM         = $(CROSS_COMPILE)nm
  58 OBJDUMP    = $(CROSS_COMPILE)objdump
  59 STRIPTOOL  = $(CROSS_COMPILE)strip
  60
  61 INSTALL    = install
  62 LN         = ln
  63 RM         = rm -f
  64 TAR        = tar
  65 SED        = sed
  66 AWK        = awk
  67
  68 STRIP_FLAGS ?= -x -R .note -R .comment
  69
  70 # Select the compiler needed to build binaries for your development system
  71 HOSTCC     = gcc
  72 BUILD_CFLAGS = -Os
  73
  74 #---------------------------------------------------------
  75 # Nothing beyond this point should ever be touched by mere
  76 # mortals.  Unless you hang out with the gods, you should
  77 # probably leave all this stuff alone.
  78
  79 # strip quotes
  80 qstrip = $(strip $(subst ",,$(1)))
  81 #"))
  82
  83 # kconfig stuff
  84 KCONFIG_CONFIG ?= $(top_builddir).config
  85 KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  86 export KCONFIG_CONFIG
  87 KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  88 export KCONFIG_AUTOCONFIG
  89 KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  90 export KCONFIG_TRISTATE
  91 srctree := $(abspath $(top_srcdir))
  92 export srctree
  93 KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  94 export KCONFIG_AUTOHEADER
  95 Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  96
  97 # Pull in the user's uClibc configuration
  98 ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
  99 -include $(KCONFIG_CONFIG)
 100 endif
 101
 102 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
 103 ifeq ($(TARGET_ARCH),)
 104 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
 105                                   -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
 106                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 107                                   -e s/nds32.*/nds32/ \
 108                                   -e s/sh.*/sh/ \
 109                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
 110                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 111                                   -e s/xtensa.*/xtensa/ )
 112 else
 113 ARCH = $(TARGET_ARCH)
 114 endif
 115 export ARCH
 116
 117 # Make certain these contain a final "/", but no "//"s.
 118 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
 119 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
 120 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
 121 DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
 122 MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
 123 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
 124 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
 125
 126
 127 # Now config hard core
 128 MAJOR_VERSION := 1
 129 MINOR_VERSION := 0
 130 SUBLEVEL      := 18
 131 EXTRAVERSION  :=
 132 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 133 ABI_VERSION   := $(MAJOR_VERSION)
 134 ifneq ($(EXTRAVERSION),)
 135 VERSION       := $(VERSION)$(EXTRAVERSION)
 136 endif
 137 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 138 LC_ALL := C
 139 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 140
 141 LIBC := libc
 142 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
 143 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
 144
 145 UCLIBC_LDSO_NAME := ld-uClibc
 146 ARCH_NATIVE_BIT := 32
 147 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
 148 UCLIBC_LDSO_NAME := ld64-uClibc
 149 ARCH_NATIVE_BIT := 64
 150 else
 151 ifeq ($(CONFIG_MIPS_N64_ABI),y)
 152 UCLIBC_LDSO_NAME := ld64-uClibc
 153 ARCH_NATIVE_BIT := 64
 154 endif
 155 endif
 156
 157 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 158 NONSHARED_LIBNAME := uclibc_nonshared.a
 159 NONSHARED_LIBPTHREAD := libpthread_nonshared.a
 160
 161 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 162 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 163 interp := $(top_builddir)lib/interp.os
 164 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 165 headers_dep := $(top_builddir)include/bits/sysnum.h \
 166         $(top_builddir)include/bits/uClibc_config.h
 167 sub_headers := $(headers_dep)
 168
 169 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 170
 171 # Make sure DESTDIR and PREFIX can be used to install
 172 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 173 ifndef PREFIX
 174 PREFIX = $(DESTDIR)
 175 endif
 176
 177 ifneq ($(HAVE_SHARED),y)
 178 libc :=
 179 interp :=
 180 ldso :=
 181 endif
 182
 183 comma:=,
 184 space:= #
 185
 186 ifeq ($(CROSS_COMPILE),)
 187 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 188 endif
 189
 190 # A nifty macro to make testing gcc features easier
 191 check_gcc=$(shell \
 192         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 193         then echo "$(1)"; else echo "$(2)"; fi)
 194 check_as=$(shell \
 195         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 196         then echo "-Wa,$(1)"; fi)
 197 check_ld=$(shell \
 198         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 199         then echo "$(1)"; fi)
 200
 201 # Use variable indirection here so that we can have variable
 202 # names with fun chars in them like equal signs
 203 define check-tool-var
 204 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 205 _v = $(2)_$(3)
 206 ifndef $$(_v)
 207 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 208 export $$(_v)
 209 endif
 210 endif
 211 endef
 212
 213 # Usage: check-gcc-var,<flag>
 214 # Check the C compiler to see if it supports <flag>.
 215 # Export the variable CFLAG_<flag> if it does.
 216 define check-gcc-var
 217 $(call check-tool-var,check_gcc,CFLAG,$(1))
 218 endef
 219 # Usage: check-as-var,<flag>
 220 # Check the assembler to see if it supports <flag>.  Export the
 221 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 222 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 223 define check-as-var
 224 $(call check-tool-var,check_as,ASFLAG,$(1))
 225 _v = CFLAG_-Wa$(1)
 226 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 227 endef
 228 # Usage: check-ld-var,<flag>
 229 # Check the linker to see if it supports <flag>.  Export the
 230 # variable LDFLAG_<flag> if it does (for invoking the linker),
 231 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 232 define check-ld-var
 233 $(call check-tool-var,check_ld,LDFLAG,$(1))
 234 _v = CFLAG_-Wl$(1)
 235 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 236 endef
 237 # Usage: cache-output-var,<variable>,<shell command>
 238 # Execute <shell command> and cache the output in <variable>.
 239 define cache-output-var
 240 ifndef $(1)
 241 $(1) := $$(shell $(2))
 242 export $(1)
 243 endif
 244 endef
 245
 246
 247 ARFLAGS:=cr
 248
 249 # Note: The check for -nostdlib has to be before all calls to check_ld
 250 $(eval $(call check-gcc-var,-nostdlib))
 251 $(eval $(call check-gcc-var,-nostartfiles))
 252 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 253 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 254 # failed to merge target specific data of file /dev/null
 255 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 256 $(eval $(call check-ld-var,--no-warn-mismatch))
 257
 258 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 259 GCC_VER := $(subst ., ,$(GCC_VER))
 260 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 261 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 262
 263 # Flags in OPTIMIZATION are used only for non-debug builds
 264
 265 OPTIMIZATION:=
 266 OPTIMIZATION-$(GCC_MAJOR_VER):=
 267 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 268
 269 # Use '-Os' optimization if available, else use -O2, allow Config to override
 270 $(eval $(call check-gcc-var,-Os))
 271 ifneq ($(CFLAG_-Os),)
 272 OPTIMIZATION += $(CFLAG_-Os)
 273 else
 274 $(eval $(call check-gcc-var,-O2))
 275 OPTIMIZATION += $(CFLAG_-O2)
 276 endif
 277 # Use the gcc 3.4 -funit-at-a-time optimization when available
 278 $(eval $(call check-gcc-var,-funit-at-a-time))
 279 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 280 $(eval $(call check-gcc-var,-fstrict-aliasing))
 281 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 282
 283 # CPU_CFLAGS-y contain options which are not warnings,
 284 # not include or library paths, and not optimizations.
 285
 286 # Why -funsigned-char: I hunted a bug related to incorrect
 287 # sign extension of 'char' type for 10 hours straight. Not fun.
 288 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 289
 290 $(eval $(call check-gcc-var,-fno-asm))
 291 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 292 $(eval $(call check-gcc-var,-fmerge-all-constants))
 293 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 294
 295 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 296 ifneq ($(TARGET_ARCH),bfin)
 297 ifneq ($(TARGET_ARCH),lm32)
 298 ifneq ($(TARGET_ARCH),nios2)
 299 ifneq ($(TARGET_ARCH),nds32)
 300 ifneq ($(TARGET_ARCH),sh)
 301 ifneq ($(TARGET_ARCH),c6x)
 302 ifneq ($(TARGET_ARCH),h8300)
 303 ifneq ($(TARGET_ARCH),arc)
 304 CPU_CFLAGS-y += -msoft-float
 305 endif
 306 endif
 307 endif
 308 endif
 309 endif
 310 endif
 311 endif
 312 endif
 313 endif
 314
 315 $(eval $(call check-gcc-var,-std=gnu99))
 316 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 317
 318 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 319 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 320
 321 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 322 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 323
 324 PICFLAG-y := -fPIC
 325 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 326 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 327 PICFLAG := $(PICFLAG-y)
 328 PIEFLAG_NAME:=-fPIE
 329
 330 $(eval $(call check-gcc-var,-fdata-sections))
 331 $(eval $(call check-gcc-var,-ffunction-sections))
 332
 333 # Some nice CPU specific optimizations
 334 ifeq ($(TARGET_ARCH),i386)
 335 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 336         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 337
 338 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 339         # TODO: Change this to a gcc version check.  This bug
 340         # should be fixed with at least gcc-4.3.
 341         # Non-SSE capable processor.
 342         # NB: this may make SSE insns segfault!
 343         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 344         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 345         # -m32 is needed if host is 64-bit
 346         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 347 else
 348 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 349         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 350 endif
 351
 352         # Choice of alignment (please document why!)
 353         #  -falign-labels: in-line labels
 354         #  (reachable by normal code flow, aligning will insert nops
 355         #  which will be executed - may even make things slower)
 356         #  -falign-jumps: reachable only by a jump
 357         # Generic: no alignment at all (smallest code)
 358         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 359         OPTIMIZATION+=$(GCC_FALIGN)
 360
 361         # Putting each function and data object into its own section
 362         # allows for kbytes of less text if users link against static uclibc
 363         # using ld --gc-sections.
 364         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 365         # do not use --gc-sections at shared lib link time.
 366         # However, in combination with sections being sorted by alignment
 367         # it does result in much reduced padding:
 368         #   text    data     bss     dec     hex
 369         # 235319    1472    5992  242783   3b45f old.so
 370         # 234104    1472    5980  241556   3af94 new.so
 371         # Without -ffunction-sections, all functions will get aligned
 372         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 373         # It specifies 4 byte align for .text even if not told to do so:
 374         # Idx Name          Size      VMA       LMA       File off  Algn
 375         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 376         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 377         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 378 $(eval $(call check-ld-var,--sort-section=alignment))
 379         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 380
 381         CPU_LDFLAGS-y+=-m32
 382         CPU_CFLAGS-y+=-m32
 383 endif
 384
 385 ifeq ($(TARGET_ARCH),sparc)
 386         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 387         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 388         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 389         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 390 endif
 391
 392 ifeq ($(TARGET_ARCH),arm)
 393         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 394         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 395 endif
 396
 397 ifeq ($(TARGET_ARCH),metag)
 398         SYMBOL_PREFIX=_
 399         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 400         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 401 endif
 402
 403 ifeq ($(TARGET_ARCH),mips)
 404         OPTIMIZATION+=-mno-split-addresses
 405         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 406         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 407         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 408         CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=-mnan=legacy
 409         CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=-mnan=2008
 410         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 411 endif
 412
 413 ifeq ($(TARGET_ARCH),nds32)
 414         CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
 415         CFLAGS-.os+= -DPIC
 416         CFLAGS-.oS+= -DPIC
 417 endif
 418
 419 ifeq ($(TARGET_ARCH),sh)
 420 $(eval $(call check-gcc-var,-mprefergot))
 421         OPTIMIZATION += $(CFLAG_-mprefergot)
 422         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 423         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 424         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 425         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 426 ifeq ($(UCLIBC_HAS_FPU),y)
 427         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 428         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 429         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
 430 else
 431         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 432         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 433         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
 434 endif
 435 endif
 436
 437 ifeq ($(TARGET_ARCH),h8300)
 438         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 439         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 440 endif
 441
 442 ifeq ($(TARGET_ARCH),cris)
 443         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 444         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 445         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 446         PICFLAG:=-fpic
 447         PIEFLAG_NAME:=-fpie
 448 endif
 449
 450 ifeq ($(TARGET_ARCH),m68k)
 451         # -fPIC is only supported for 68020 and above.  It is not supported
 452         # for 68000, 68010, or Coldfire.
 453         PICFLAG:=-fpic
 454         PIEFLAG_NAME:=-fpie
 455 endif
 456
 457 ifeq ($(TARGET_ARCH),powerpc)
 458 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 459 # enough. Therefore use -fpic which will reduce code size and generates
 460 # faster code.
 461         PICFLAG:=-fpic
 462         PIEFLAG_NAME:=-fpie
 463         PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 464         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 465         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 466
 467 endif
 468
 469 ifeq ($(TARGET_ARCH),bfin)
 470         SYMBOL_PREFIX=_
 471 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 472         CPU_CFLAGS-y:=-mfdpic
 473         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 474         PICFLAG:=-fpic
 475         PIEFLAG_NAME:=-fpie
 476 endif
 477 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 478         PICFLAG := -mleaf-id-shared-library
 479 endif
 480 endif
 481
 482 ifeq ($(TARGET_ARCH),frv)
 483         # Using -pie causes the program to have an interpreter, which is
 484         # forbidden, so we must make do with -shared.  Unfortunately,
 485         # -shared by itself would get us global function descriptors
 486         # and calls through PLTs, dynamic resolution of symbols, etc,
 487         # which would break as well, but -Bsymbolic comes to the rescue.
 488         CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
 489 endif
 490
 491 ifeq ($(strip $(TARGET_ARCH)),avr32)
 492        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 493        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 494        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 495 endif
 496
 497 ifeq ($(TARGET_ARCH),c6x)
 498         PIEFLAG:=
 499         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 500         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 501         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 502         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 503         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 504 endif
 505
 506 ifeq ($(TARGET_ARCH),arc)
 507         CPU_CFLAGS-y += -mlock -mswape
 508         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 509         CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
 510         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 511 endif
 512
 513 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 514 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 515 ifeq ($(PIEFLAG),)
 516 PIEFLAG := $(PICFLAG)
 517 endif
 518 # We need to keep track of both the CC PIE flag (above) as
 519 # well as the LD PIE flag (below) because we can't rely on
 520 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 521 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 522 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 523
 524 # Check for --as-needed support in linker
 525 ifndef LD_FLAG_ASNEEDED
 526 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 527 ifneq ($(_LD_FLAG_ASNEEDED),)
 528 export LD_FLAG_ASNEEDED:=--as-needed
 529 endif
 530 endif
 531 ifndef LD_FLAG_NO_ASNEEDED
 532 ifdef LD_FLAG_ASNEEDED
 533 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 534 endif
 535 endif
 536 ifndef CC_FLAG_ASNEEDED
 537 ifdef LD_FLAG_ASNEEDED
 538 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 539 endif
 540 endif
 541 ifndef CC_FLAG_NO_ASNEEDED
 542 ifdef LD_FLAG_NO_ASNEEDED
 543 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 544 endif
 545 endif
 546 link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
 547
 548 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 549 ifndef ASNEEDED
 550 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 551
 552 # Only used in installed libc.so linker script
 553 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 554 ifeq ($(HARDWIRED_ABSPATH),y)
 555 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 556 else
 557 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 558 endif
 559 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 560         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 561         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 562 else
 563 export UBACKTRACE_ASNEEDED:=""
 564 endif
 565 ifeq ($(UCLIBC_HAS_ARGP),y)
 566 ifeq ($(HARDWIRED_ABSPATH),y)
 567 # Only used in installed libc.so linker script
 568 UARGP_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/libuargp.so.$(MAJOR_VERSION))
 569 else
 570 UARGP_FULL_NAME := libuargp.so.$(MAJOR_VERSION)
 571 endif
 572 export UARGP_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 573         echo "GROUP ( AS_NEEDED ( $(UARGP_FULL_NAME) ) )" || \
 574         echo "GROUP ( $(UARGP_FULL_NAME) )")
 575 else
 576 export UARGP_ASNEEDED:=""
 577 endif
 578 endif
 579
 580 # Add a bunch of extra pedantic annoyingly strict checks
 581 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 582 ifeq ($(EXTRA_WARNINGS),y)
 583 WARNING_FLAGS += \
 584         -Wformat=2 \
 585         -Wmissing-noreturn \
 586         -Wmissing-format-attribute \
 587         -Wmissing-prototypes \
 588         -Wmissing-declarations \
 589         -Wnested-externs \
 590         -Wnonnull \
 591         -Wold-style-declaration \
 592         -Wold-style-definition \
 593         -Wdeclaration-after-statement \
 594         -Wshadow \
 595         -Wundef
 596 endif
 597 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 598 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 599 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 600
 601 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 602
 603 # Save the tested flag in a single variable and force it to be
 604 # evaluated just once.  Then use that computed value.
 605 $(eval $(call check-gcc-var,-fno-stack-protector))
 606 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 607 ifeq ($(UCLIBC_BUILD_SSP),y)
 608 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 609 $(eval $(call check-gcc-var,-fstack-protector))
 610 $(eval $(call check-gcc-var,-fstack-protector-all))
 611 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 612 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 613 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 614 else
 615 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 616 endif
 617
 618 # Collect all CFLAGS components
 619 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 620         -nostdinc -I$(top_builddir)include \
 621         -I$(top_srcdir)include -include libc-symbols.h \
 622         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 623         -I$(top_srcdir)libc/sysdeps/linux \
 624         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 625         -I$(top_srcdir)ldso/include -I.
 626
 627 # We need this to be checked within libc-symbols.h
 628 ifneq ($(HAVE_SHARED),y)
 629 CFLAGS += -DSTATIC
 630 endif
 631
 632 $(eval $(call check-ld-var,--warn-once))
 633 $(eval $(call check-ld-var,--sort-common))
 634 $(eval $(call check-ld-var,--discard-all))
 635 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 636         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 637
 638 ifeq ($(UCLIBC_BUILD_RELRO),y)
 639 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 640 endif
 641
 642 ifeq ($(UCLIBC_BUILD_NOW),y)
 643 LDFLAGS_NOSTRIP+=-Wl,-z,now
 644 endif
 645
 646 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 647 # Be sure that binutils support it
 648 $(eval $(call check-ld-var,--hash-style=gnu))
 649 ifeq ($(LDFLAG_--hash-style=gnu),)
 650 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 651 $(error Your binutils do not support --hash-style option, while you want to use it)
 652 endif
 653 else
 654 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 655 endif
 656 endif
 657
 658 ifeq ($(DODEBUG),y)
 659 CFLAGS += -O0 -g3 -DDEBUG
 660 else
 661 CFLAGS += $(OPTIMIZATION)
 662 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 663 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 664 $(eval $(call check-ld-var,-O2))
 665 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 666 endif
 667
 668 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 669
 670 ifeq ($(DOSTRIP),y)
 671 LDFLAGS += -Wl,-s
 672 else
 673 STRIPTOOL := true -Stripping_disabled
 674 endif
 675
 676 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 677 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 678 endif
 679 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 680 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 681 endif
 682
 683 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 684 CFLAGS += -D__USE_STDIO_FUTEXES__
 685 endif
 686
 687 ifeq ($(UCLIBC_HAS_THREADS),y)
 688 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 689         PTNAME := nptl
 690         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 691 else
 692 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
 693         PTNAME := linuxthreads
 694 endif
 695 endif
 696 PTDIR := libpthread/$(PTNAME)
 697 # set up system dependencies include dirs (NOTE: order matters!)
 698 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 699 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 700         -I$(top_srcdir)$(PTDIR)                                         \
 701         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 702         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 703         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 704         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 705         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 706         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 707         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 708         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 709         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 710 #
 711 # Test for TLS if NPTL support was selected.
 712 #
 713 GCC_HAS_TLS=$(shell \
 714         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 715 ifneq ($(GCC_HAS_TLS),)
 716 gcc_tls_test_fail:
 717         @echo "####";
 718         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 719         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 720         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 721         @echo "#### about this problem.";
 722         @echo "####";
 723         @echo "#### Exiting...";
 724         @echo "####";
 725         @exit 1;
 726 endif
 727 else
 728 PTINC := \
 729         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 730         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 731         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 732         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 733         -I$(top_srcdir)$(PTDIR) \
 734         -I$(top_srcdir)libpthread
 735 endif
 736 CFLAGS+=$(PTINC)
 737 else
 738         PTNAME :=
 739         PTINC  :=
 740 endif
 741 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 742
 743 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 744 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 745 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 746 CFLAGS += $(CC_INC)
 747
 748 CFLAGS += -I$(KERNEL_HEADERS)
 749
 750 ifneq ($(DOASSERTS),y)
 751 CFLAGS+=-DNDEBUG
 752 endif
 753
 754 ifeq ($(SYMBOL_PREFIX),_)
 755 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 756 endif
 757
 758 # Keep the check_as from being needlessly executed
 759 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 760 $(eval $(call check-as-var,--noexecstack))
 761 endif
 762 ASFLAGS += $(ASFLAG_--noexecstack)
 763
 764 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 765 $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 766 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 767 # with -O0 we (e.g. lockf) might end up with references to
 768 # _Unwind_Resume, so pull in gcc_eh in this case..
 769 # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
 770 # in libgcc.a, so check if the printed file exist, before adding to the commandline
 771 LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
 772 LIBGCC_DIR := $(dir $(LIBGCC_A))
 773 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
 774
 775 # moved from libpthread/linuxthreads
 776 ifeq ($(UCLIBC_CTOR_DTOR),y)
 777 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 778 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 779 endif
 780
 781 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 782
 783 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"