Rules.mak

   1 # Rules.make 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/sh.*/sh/ \
 108                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
 109                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 110                                   -e s/xtensa.*/xtensa/ )
 111 else
 112 ARCH = $(TARGET_ARCH)
 113 endif
 114 export ARCH
 115
 116 # Make certain these contain a final "/", but no "//"s.
 117 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
 118 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
 119 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
 120 DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
 121 MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
 122 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
 123 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
 124
 125
 126 # Now config hard core
 127 MAJOR_VERSION := 1
 128 MINOR_VERSION := 0
 129 SUBLEVEL      := 1
 130 EXTRAVERSION  :=-git
 131 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 132 ABI_VERSION   := $(MAJOR_VERSION)
 133 ifneq ($(EXTRAVERSION),)
 134 VERSION       := $(VERSION)$(EXTRAVERSION)
 135 endif
 136 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 137 LC_ALL := C
 138 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 139
 140 LIBC := libc
 141 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
 142 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
 143
 144 UCLIBC_LDSO_NAME := ld-uClibc
 145 ARCH_NATIVE_BIT := 32
 146 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
 147 UCLIBC_LDSO_NAME := ld64-uClibc
 148 ARCH_NATIVE_BIT := 64
 149 else
 150 ifeq ($(CONFIG_MIPS_N64_ABI),y)
 151 UCLIBC_LDSO_NAME := ld64-uClibc
 152 ARCH_NATIVE_BIT := 64
 153 endif
 154 endif
 155
 156 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 157 NONSHARED_LIBNAME := uclibc_nonshared.a
 158 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 159 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 160 ifneq ($(ARCH_HAS_NO_SHARED),y)
 161 libdl.depend := $(top_builddir)lib/libdl.so
 162 endif
 163 ifneq ($(HAS_NO_THREADS),y)
 164 libpthread.depend := $(top_builddir)lib/libpthread.so
 165 endif
 166 interp := $(top_builddir)lib/interp.os
 167 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 168 headers_dep := $(top_builddir)include/bits/sysnum.h \
 169         $(top_builddir)include/bits/uClibc_config.h
 170 sub_headers := $(headers_dep)
 171
 172 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 173 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 174
 175 # Make sure DESTDIR and PREFIX can be used to install
 176 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 177 ifndef PREFIX
 178 PREFIX = $(DESTDIR)
 179 endif
 180
 181 ifneq ($(HAVE_SHARED),y)
 182 libc :=
 183 interp :=
 184 ldso :=
 185 endif
 186
 187 comma:=,
 188 space:= #
 189
 190 ifeq ($(CROSS_COMPILE),)
 191 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 192 endif
 193
 194 # A nifty macro to make testing gcc features easier
 195 check_gcc=$(shell \
 196         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 197         then echo "$(1)"; else echo "$(2)"; fi)
 198 check_as=$(shell \
 199         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 200         then echo "-Wa,$(1)"; fi)
 201 check_ld=$(shell \
 202         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 203         then echo "$(1)"; fi)
 204
 205 # Use variable indirection here so that we can have variable
 206 # names with fun chars in them like equal signs
 207 define check-tool-var
 208 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 209 _v = $(2)_$(3)
 210 ifndef $$(_v)
 211 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 212 export $$(_v)
 213 endif
 214 endif
 215 endef
 216
 217 # Usage: check-gcc-var,<flag>
 218 # Check the C compiler to see if it supports <flag>.
 219 # Export the variable CFLAG_<flag> if it does.
 220 define check-gcc-var
 221 $(call check-tool-var,check_gcc,CFLAG,$(1))
 222 endef
 223 # Usage: check-as-var,<flag>
 224 # Check the assembler to see if it supports <flag>.  Export the
 225 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 226 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 227 define check-as-var
 228 $(call check-tool-var,check_as,ASFLAG,$(1))
 229 _v = CFLAG_-Wa$(1)
 230 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 231 endef
 232 # Usage: check-ld-var,<flag>
 233 # Check the linker to see if it supports <flag>.  Export the
 234 # variable LDFLAG_<flag> if it does (for invoking the linker),
 235 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 236 define check-ld-var
 237 $(call check-tool-var,check_ld,LDFLAG,$(1))
 238 _v = CFLAG_-Wl$(1)
 239 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 240 endef
 241 # Usage: cache-output-var,<variable>,<shell command>
 242 # Execute <shell command> and cache the output in <variable>.
 243 define cache-output-var
 244 ifndef $(1)
 245 $(1) := $$(shell $(2))
 246 export $(1)
 247 endif
 248 endef
 249
 250
 251 ARFLAGS:=cr
 252
 253 # Note: The check for -nostdlib has to be before all calls to check_ld
 254 $(eval $(call check-gcc-var,-nostdlib))
 255 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 256 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 257 # failed to merge target specific data of file /dev/null
 258 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 259 $(eval $(call check-ld-var,--no-warn-mismatch))
 260
 261 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 262 GCC_VER := $(subst ., ,$(GCC_VER))
 263 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 264 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 265
 266 # Flags in OPTIMIZATION are used only for non-debug builds
 267
 268 OPTIMIZATION:=
 269 OPTIMIZATION-$(GCC_MAJOR_VER):=
 270 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 271
 272 # Use '-Os' optimization if available, else use -O2, allow Config to override
 273 $(eval $(call check-gcc-var,-Os))
 274 ifneq ($(CFLAG_-Os),)
 275 OPTIMIZATION += $(CFLAG_-Os)
 276 else
 277 $(eval $(call check-gcc-var,-O2))
 278 OPTIMIZATION += $(CFLAG_-O2)
 279 endif
 280 # Use the gcc 3.4 -funit-at-a-time optimization when available
 281 $(eval $(call check-gcc-var,-funit-at-a-time))
 282 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 283 $(eval $(call check-gcc-var,-fstrict-aliasing))
 284 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 285
 286 # CPU_CFLAGS-y contain options which are not warnings,
 287 # not include or library paths, and not optimizations.
 288
 289 # Why -funsigned-char: I hunted a bug related to incorrect
 290 # sign extension of 'char' type for 10 hours straight. Not fun.
 291 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 292
 293 $(eval $(call check-gcc-var,-fno-asm))
 294 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 295
 296 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 297 ifneq ($(TARGET_ARCH),bfin)
 298 ifneq ($(TARGET_ARCH),nios2)
 299 ifneq ($(TARGET_ARCH),sh)
 300 ifneq ($(TARGET_ARCH),c6x)
 301 CPU_CFLAGS-y += -msoft-float
 302 endif
 303 endif
 304 endif
 305 endif
 306 endif
 307
 308 $(eval $(call check-gcc-var,-std=gnu99))
 309 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 310
 311 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 312 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 313
 314 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 315 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 316
 317 PICFLAG-y := -fPIC
 318 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 319 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 320 PICFLAG := $(PICFLAG-y)
 321 PIEFLAG_NAME:=-fPIE
 322
 323 # Some nice CPU specific optimizations
 324 ifeq ($(TARGET_ARCH),i386)
 325 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 326         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 327
 328 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 329         # TODO: Change this to a gcc version check.  This bug
 330         # should be fixed with at least gcc-4.3.
 331         # Non-SSE capable processor.
 332         # NB: this may make SSE insns segfault!
 333         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 334         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 335         # -m32 is needed if host is 64-bit
 336         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 337 else
 338 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 339         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 340 endif
 341
 342         # Choice of alignment (please document why!)
 343         #  -falign-labels: in-line labels
 344         #  (reachable by normal code flow, aligning will insert nops
 345         #  which will be executed - may even make things slower)
 346         #  -falign-jumps: reachable only by a jump
 347         # Generic: no alignment at all (smallest code)
 348         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 349         OPTIMIZATION+=$(GCC_FALIGN)
 350
 351         # Putting each function and data object into its own section
 352         # allows for kbytes of less text if users link against static uclibc
 353         # using ld --gc-sections.
 354         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 355         # do not use --gc-sections at shared lib link time.
 356         # However, in combination with sections being sorted by alignment
 357         # it does result in much reduced padding:
 358         #   text    data     bss     dec     hex
 359         # 235319    1472    5992  242783   3b45f old.so
 360         # 234104    1472    5980  241556   3af94 new.so
 361         # Without -ffunction-sections, all functions will get aligned
 362         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 363         # It specifies 4 byte align for .text even if not told to do so:
 364         # Idx Name          Size      VMA       LMA       File off  Algn
 365         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 366         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 367         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 368 $(eval $(call check-ld-var,--sort-section=alignment))
 369         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 370
 371         CPU_LDFLAGS-y+=-m32
 372         CPU_CFLAGS-y+=-m32
 373 endif
 374
 375 ifeq ($(TARGET_ARCH),sparc)
 376         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 377         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 378         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 379         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 380 endif
 381
 382 ifeq ($(TARGET_ARCH),arm)
 383         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 384         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 385         CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
 386 endif
 387
 388 ifeq ($(TARGET_ARCH),metag)
 389         SYMBOL_PREFIX=_
 390         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 391         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 392 endif
 393
 394 ifeq ($(TARGET_ARCH),mips)
 395         OPTIMIZATION+=-mno-split-addresses
 396         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 397         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 398         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 399         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 400 endif
 401
 402 ifeq ($(TARGET_ARCH),nios)
 403         OPTIMIZATION+=-funaligned-struct-hack
 404         CPU_LDFLAGS-y+=-Wl,-m32
 405         CPU_CFLAGS-y+=-Wl,-m32
 406 endif
 407
 408 ifeq ($(TARGET_ARCH),sh)
 409 $(eval $(call check-gcc-var,-mprefergot))
 410         OPTIMIZATION += $(CFLAG_-mprefergot)
 411         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 412         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 413         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 414         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 415 ifeq ($(UCLIBC_HAS_FPU),y)
 416         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 417         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 418 else
 419         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 420         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 421 endif
 422 endif
 423
 424 ifeq ($(TARGET_ARCH),sh64)
 425         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 426         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 427         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 428 endif
 429
 430 ifeq ($(TARGET_ARCH),h8300)
 431         SYMBOL_PREFIX=_
 432         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
 433         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-ms8300s
 434         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 435         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 436 endif
 437
 438 ifeq ($(TARGET_ARCH),i960)
 439         OPTIMIZATION+=-mh -mint32 #-fsigned-char
 440 endif
 441
 442 ifeq ($(TARGET_ARCH),e1)
 443         OPTIMIZATION+=-mgnu-param
 444 endif
 445
 446 ifeq ($(TARGET_ARCH),cris)
 447         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 448         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 449         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 450         PICFLAG:=-fpic
 451         PIEFLAG_NAME:=-fpie
 452 endif
 453
 454 ifeq ($(TARGET_ARCH),m68k)
 455         # -fPIC is only supported for 68020 and above.  It is not supported
 456         # for 68000, 68010, or Coldfire.
 457         PICFLAG:=-fpic
 458         PIEFLAG_NAME:=-fpie
 459 endif
 460
 461 ifeq ($(TARGET_ARCH),powerpc)
 462 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 463 # enough. Therefore use -fpic which will reduce code size and generates
 464 # faster code.
 465         PICFLAG:=-fpic
 466         PIEFLAG_NAME:=-fpie
 467         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 468         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 469         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 470
 471 endif
 472
 473 ifeq ($(TARGET_ARCH),bfin)
 474         SYMBOL_PREFIX=_
 475 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 476         CPU_CFLAGS-y:=-mfdpic
 477         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 478         PICFLAG:=-fpic
 479         PIEFLAG_NAME:=-fpie
 480 endif
 481 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 482         PICFLAG := -mleaf-id-shared-library
 483 endif
 484 endif
 485
 486 ifeq ($(TARGET_ARCH),frv)
 487         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 488         # Using -pie causes the program to have an interpreter, which is
 489         # forbidden, so we must make do with -shared.  Unfortunately,
 490         # -shared by itself would get us global function descriptors
 491         # and calls through PLTs, dynamic resolution of symbols, etc,
 492         # which would break as well, but -Bsymbolic comes to the rescue.
 493         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 494         UCLIBC_LDSO=ld.so.1
 495 endif
 496
 497 ifeq ($(strip $(TARGET_ARCH)),avr32)
 498        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 499        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 500        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 501 endif
 502
 503 ifeq ($(TARGET_ARCH),i960)
 504       SYMBOL_PREFIX=_
 505 endif
 506
 507 ifeq ($(TARGET_ARCH),v850)
 508       SYMBOL_PREFIX=_
 509 endif
 510
 511 ifeq ($(TARGET_ARCH),c6x)
 512         PIEFLAG:=
 513         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 514         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 515         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 516         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 517         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 518 endif
 519
 520 ifeq ($(TARGET_ARCH),arc)
 521         CPU_CFLAGS-y += -mlock -mswape
 522         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 523         CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
 524         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 525 endif
 526
 527 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 528 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 529 ifeq ($(PIEFLAG),)
 530 PIEFLAG := $(PICFLAG)
 531 endif
 532 # We need to keep track of both the CC PIE flag (above) as
 533 # well as the LD PIE flag (below) because we can't rely on
 534 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 535 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 536 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 537
 538 # Check for --as-needed support in linker
 539 ifndef LD_FLAG_ASNEEDED
 540 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 541 ifneq ($(_LD_FLAG_ASNEEDED),)
 542 export LD_FLAG_ASNEEDED:=--as-needed
 543 endif
 544 endif
 545 ifndef LD_FLAG_NO_ASNEEDED
 546 ifdef LD_FLAG_ASNEEDED
 547 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 548 endif
 549 endif
 550 ifndef CC_FLAG_ASNEEDED
 551 ifdef LD_FLAG_ASNEEDED
 552 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 553 endif
 554 endif
 555 ifndef CC_FLAG_NO_ASNEEDED
 556 ifdef LD_FLAG_NO_ASNEEDED
 557 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 558 endif
 559 endif
 560 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 561
 562 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 563 ifndef ASNEEDED
 564 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 565
 566 # Only used in installed libc.so linker script
 567 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 568 ifeq ($(HARDWIRED_ABSPATH),y)
 569 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 570 else
 571 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 572 endif
 573 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 574         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 575         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 576 else
 577 export UBACKTRACE_ASNEEDED:=""
 578 endif
 579 endif
 580
 581 # Add a bunch of extra pedantic annoyingly strict checks
 582 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 583 ifeq ($(EXTRA_WARNINGS),y)
 584 WARNING_FLAGS += \
 585         -Wformat=2 \
 586         -Wmissing-noreturn \
 587         -Wmissing-format-attribute \
 588         -Wmissing-prototypes \
 589         -Wmissing-declarations \
 590         -Wnested-externs \
 591         -Wnonnull \
 592         -Wold-style-declaration \
 593         -Wold-style-definition \
 594         -Wshadow \
 595         -Wundef
 596 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 597 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 598 endif
 599 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 600 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 601 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 602
 603 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 604
 605 # Save the tested flag in a single variable and force it to be
 606 # evaluated just once.  Then use that computed value.
 607 $(eval $(call check-gcc-var,-fno-stack-protector))
 608 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 609 ifeq ($(UCLIBC_BUILD_SSP),y)
 610 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 611 $(eval $(call check-gcc-var,-fstack-protector))
 612 $(eval $(call check-gcc-var,-fstack-protector-all))
 613 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 614 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 615 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 616 else
 617 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 618 endif
 619
 620 # Collect all CFLAGS components
 621 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 622         -nostdinc -I$(top_builddir)include \
 623         -I$(top_srcdir)include -include libc-symbols.h \
 624         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 625         -I$(top_srcdir)libc/sysdeps/linux \
 626         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 627         -I$(top_srcdir)ldso/include -I.
 628
 629 # We need this to be checked within libc-symbols.h
 630 ifneq ($(HAVE_SHARED),y)
 631 CFLAGS += -DSTATIC
 632 endif
 633
 634 $(eval $(call check-ld-var,--warn-once))
 635 $(eval $(call check-ld-var,--sort-common))
 636 $(eval $(call check-ld-var,--discard-all))
 637 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 638         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 639 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 640 #$(eval $(call check-ld-var,--gc-sections))
 641 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 642
 643 $(eval $(call check-gcc-var,-fdata-sections))
 644 $(eval $(call check-gcc-var,-ffunction-sections))
 645
 646 ifeq ($(UCLIBC_BUILD_RELRO),y)
 647 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 648 endif
 649
 650 ifeq ($(UCLIBC_BUILD_NOW),y)
 651 LDFLAGS_NOSTRIP+=-Wl,-z,now
 652 endif
 653
 654 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 655 # Be sure that binutils support it
 656 $(eval $(call check-ld-var,--hash-style=gnu))
 657 ifeq ($(LDFLAG_--hash-style=gnu),)
 658 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 659 $(error Your binutils do not support --hash-style option, while you want to use it)
 660 endif
 661 else
 662 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 663 endif
 664 endif
 665
 666 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 667 ifeq ($(DODEBUG),y)
 668 CFLAGS += -O0 -g3 -DDEBUG
 669 else
 670 CFLAGS += $(OPTIMIZATION)
 671 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 672 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 673 endif
 674 ifeq ($(DOSTRIP),y)
 675 LDFLAGS += -Wl,-s
 676 else
 677 STRIPTOOL := true -Stripping_disabled
 678 endif
 679
 680 ifeq ($(DOMULTI),y)
 681 # we try to compile all sources at once into an object (IMA), but
 682 # gcc-3.3.x does not support it
 683 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 684 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 685 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 686 ifeq ($(GCC_MAJOR_VER),3)
 687 DOMULTI:=n
 688 else
 689 $(eval $(call check-gcc-var,--combine))
 690 CFLAGS += $(CFLAG_--combine)
 691 endif
 692 else
 693 DOMULTI:=n
 694 endif
 695
 696 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 697 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 698 endif
 699 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 700 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 701 endif
 702
 703 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 704 CFLAGS += -D__USE_STDIO_FUTEXES__
 705 endif
 706
 707 ifeq ($(UCLIBC_HAS_THREADS),y)
 708 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 709         PTNAME := nptl
 710         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 711 else
 712 ifeq ($(LINUXTHREADS_OLD),y)
 713         PTNAME := linuxthreads.old
 714 else
 715         PTNAME := linuxthreads
 716 endif
 717 endif
 718 PTDIR := libpthread/$(PTNAME)
 719 # set up system dependencies include dirs (NOTE: order matters!)
 720 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 721 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 722         -I$(top_srcdir)$(PTDIR)                                         \
 723         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 724         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 725         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 726         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 727         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 728         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 729         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 730         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 731         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 732 #
 733 # Test for TLS if NPTL support was selected.
 734 #
 735 GCC_HAS_TLS=$(shell \
 736         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 737 ifneq ($(GCC_HAS_TLS),)
 738 gcc_tls_test_fail:
 739         @echo "####";
 740         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 741         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 742         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 743         @echo "#### about this problem.";
 744         @echo "####";
 745         @echo "#### Exiting...";
 746         @echo "####";
 747         @exit 1;
 748 endif
 749 else
 750 PTINC := \
 751         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 752         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 753         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 754         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 755         -I$(top_srcdir)$(PTDIR) \
 756         -I$(top_srcdir)libpthread
 757 endif
 758 CFLAGS+=$(PTINC)
 759 else
 760         PTNAME :=
 761         PTINC  :=
 762 endif
 763 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 764
 765 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 766 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 767 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 768 CFLAGS += $(CC_INC)
 769
 770 CFLAGS += -I$(KERNEL_HEADERS)
 771
 772 ifneq ($(DOASSERTS),y)
 773 CFLAGS+=-DNDEBUG
 774 endif
 775
 776 ifeq ($(SYMBOL_PREFIX),_)
 777 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 778 endif
 779
 780 # Keep the check_as from being needlessly executed
 781 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 782 $(eval $(call check-as-var,--noexecstack))
 783 endif
 784 ASFLAGS += $(ASFLAG_--noexecstack)
 785
 786 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 787 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 788 LIBGCC_DIR:=$(dir $(LIBGCC))
 789
 790 # moved from libpthread/linuxthreads
 791 ifeq ($(UCLIBC_CTOR_DTOR),y)
 792 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 793 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 794 endif
 795
 796 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 797
 798 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"