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/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      := 16
 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 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 160 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 161 ifneq ($(ARCH_HAS_NO_SHARED),y)
 162 libdl.depend := $(top_builddir)lib/libdl.so
 163 endif
 164 ifneq ($(HAS_NO_THREADS),y)
 165 libpthread.depend := $(top_builddir)lib/libpthread.so
 166 endif
 167 interp := $(top_builddir)lib/interp.os
 168 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 169 headers_dep := $(top_builddir)include/bits/sysnum.h \
 170         $(top_builddir)include/bits/uClibc_config.h
 171 sub_headers := $(headers_dep)
 172
 173 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 174 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 175
 176 # Make sure DESTDIR and PREFIX can be used to install
 177 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 178 ifndef PREFIX
 179 PREFIX = $(DESTDIR)
 180 endif
 181
 182 ifneq ($(HAVE_SHARED),y)
 183 libc :=
 184 interp :=
 185 ldso :=
 186 endif
 187
 188 comma:=,
 189 space:= #
 190
 191 ifeq ($(CROSS_COMPILE),)
 192 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 193 endif
 194
 195 # A nifty macro to make testing gcc features easier
 196 check_gcc=$(shell \
 197         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 198         then echo "$(1)"; else echo "$(2)"; fi)
 199 check_as=$(shell \
 200         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 201         then echo "-Wa,$(1)"; fi)
 202 check_ld=$(shell \
 203         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 204         then echo "$(1)"; fi)
 205
 206 # Use variable indirection here so that we can have variable
 207 # names with fun chars in them like equal signs
 208 define check-tool-var
 209 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 210 _v = $(2)_$(3)
 211 ifndef $$(_v)
 212 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 213 export $$(_v)
 214 endif
 215 endif
 216 endef
 217
 218 # Usage: check-gcc-var,<flag>
 219 # Check the C compiler to see if it supports <flag>.
 220 # Export the variable CFLAG_<flag> if it does.
 221 define check-gcc-var
 222 $(call check-tool-var,check_gcc,CFLAG,$(1))
 223 endef
 224 # Usage: check-as-var,<flag>
 225 # Check the assembler to see if it supports <flag>.  Export the
 226 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 227 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 228 define check-as-var
 229 $(call check-tool-var,check_as,ASFLAG,$(1))
 230 _v = CFLAG_-Wa$(1)
 231 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 232 endef
 233 # Usage: check-ld-var,<flag>
 234 # Check the linker to see if it supports <flag>.  Export the
 235 # variable LDFLAG_<flag> if it does (for invoking the linker),
 236 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 237 define check-ld-var
 238 $(call check-tool-var,check_ld,LDFLAG,$(1))
 239 _v = CFLAG_-Wl$(1)
 240 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 241 endef
 242 # Usage: cache-output-var,<variable>,<shell command>
 243 # Execute <shell command> and cache the output in <variable>.
 244 define cache-output-var
 245 ifndef $(1)
 246 $(1) := $$(shell $(2))
 247 export $(1)
 248 endif
 249 endef
 250
 251
 252 ARFLAGS:=cr
 253
 254 # Note: The check for -nostdlib has to be before all calls to check_ld
 255 $(eval $(call check-gcc-var,-nostdlib))
 256 $(eval $(call check-gcc-var,-nostartfiles))
 257 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 258 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 259 # failed to merge target specific data of file /dev/null
 260 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 261 $(eval $(call check-ld-var,--no-warn-mismatch))
 262
 263 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 264 GCC_VER := $(subst ., ,$(GCC_VER))
 265 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 266 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 267
 268 # Flags in OPTIMIZATION are used only for non-debug builds
 269
 270 OPTIMIZATION:=
 271 OPTIMIZATION-$(GCC_MAJOR_VER):=
 272 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 273
 274 # Use '-Os' optimization if available, else use -O2, allow Config to override
 275 $(eval $(call check-gcc-var,-Os))
 276 ifneq ($(CFLAG_-Os),)
 277 OPTIMIZATION += $(CFLAG_-Os)
 278 else
 279 $(eval $(call check-gcc-var,-O2))
 280 OPTIMIZATION += $(CFLAG_-O2)
 281 endif
 282 # Use the gcc 3.4 -funit-at-a-time optimization when available
 283 $(eval $(call check-gcc-var,-funit-at-a-time))
 284 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 285 $(eval $(call check-gcc-var,-fstrict-aliasing))
 286 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 287
 288 # CPU_CFLAGS-y contain options which are not warnings,
 289 # not include or library paths, and not optimizations.
 290
 291 # Why -funsigned-char: I hunted a bug related to incorrect
 292 # sign extension of 'char' type for 10 hours straight. Not fun.
 293 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 294
 295 $(eval $(call check-gcc-var,-fno-asm))
 296 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 297 $(eval $(call check-gcc-var,-fmerge-all-constants))
 298 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 299
 300 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 301 ifneq ($(TARGET_ARCH),bfin)
 302 ifneq ($(TARGET_ARCH),lm32)
 303 ifneq ($(TARGET_ARCH),nios2)
 304 ifneq ($(TARGET_ARCH),nds32)
 305 ifneq ($(TARGET_ARCH),sh)
 306 ifneq ($(TARGET_ARCH),c6x)
 307 ifneq ($(TARGET_ARCH),h8300)
 308 ifneq ($(TARGET_ARCH),arc)
 309 CPU_CFLAGS-y += -msoft-float
 310 endif
 311 endif
 312 endif
 313 endif
 314 endif
 315 endif
 316 endif
 317 endif
 318 endif
 319
 320 $(eval $(call check-gcc-var,-std=gnu99))
 321 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 322
 323 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 324 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 325
 326 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 327 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 328
 329 PICFLAG-y := -fPIC
 330 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 331 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 332 PICFLAG := $(PICFLAG-y)
 333 PIEFLAG_NAME:=-fPIE
 334
 335 $(eval $(call check-gcc-var,-fdata-sections))
 336 $(eval $(call check-gcc-var,-ffunction-sections))
 337
 338 # Some nice CPU specific optimizations
 339 ifeq ($(TARGET_ARCH),i386)
 340 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 341         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 342
 343 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 344         # TODO: Change this to a gcc version check.  This bug
 345         # should be fixed with at least gcc-4.3.
 346         # Non-SSE capable processor.
 347         # NB: this may make SSE insns segfault!
 348         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 349         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 350         # -m32 is needed if host is 64-bit
 351         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 352 else
 353 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 354         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 355 endif
 356
 357         # Choice of alignment (please document why!)
 358         #  -falign-labels: in-line labels
 359         #  (reachable by normal code flow, aligning will insert nops
 360         #  which will be executed - may even make things slower)
 361         #  -falign-jumps: reachable only by a jump
 362         # Generic: no alignment at all (smallest code)
 363         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 364         OPTIMIZATION+=$(GCC_FALIGN)
 365
 366         # Putting each function and data object into its own section
 367         # allows for kbytes of less text if users link against static uclibc
 368         # using ld --gc-sections.
 369         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 370         # do not use --gc-sections at shared lib link time.
 371         # However, in combination with sections being sorted by alignment
 372         # it does result in much reduced padding:
 373         #   text    data     bss     dec     hex
 374         # 235319    1472    5992  242783   3b45f old.so
 375         # 234104    1472    5980  241556   3af94 new.so
 376         # Without -ffunction-sections, all functions will get aligned
 377         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 378         # It specifies 4 byte align for .text even if not told to do so:
 379         # Idx Name          Size      VMA       LMA       File off  Algn
 380         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 381         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 382         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 383 $(eval $(call check-ld-var,--sort-section=alignment))
 384         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 385
 386         CPU_LDFLAGS-y+=-m32
 387         CPU_CFLAGS-y+=-m32
 388 endif
 389
 390 ifeq ($(TARGET_ARCH),sparc)
 391         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 392         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 393         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 394         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 395 endif
 396
 397 ifeq ($(TARGET_ARCH),arm)
 398         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 399         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 400 endif
 401
 402 ifeq ($(TARGET_ARCH),metag)
 403         SYMBOL_PREFIX=_
 404         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 405         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 406 endif
 407
 408 ifeq ($(TARGET_ARCH),mips)
 409         OPTIMIZATION+=-mno-split-addresses
 410         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 411         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 412         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 413         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 414 endif
 415
 416 ifeq ($(TARGET_ARCH),nds32)
 417         CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
 418         CFLAGS-.os+= -DPIC
 419         CFLAGS-.oS+= -DPIC
 420 endif
 421
 422 ifeq ($(TARGET_ARCH),sh)
 423 $(eval $(call check-gcc-var,-mprefergot))
 424         OPTIMIZATION += $(CFLAG_-mprefergot)
 425         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 426         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 427         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 428         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 429 ifeq ($(UCLIBC_HAS_FPU),y)
 430         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 431         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 432         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
 433 else
 434         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 435         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 436         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
 437 endif
 438 endif
 439
 440 ifeq ($(TARGET_ARCH),h8300)
 441         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 442         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 443 endif
 444
 445 ifeq ($(TARGET_ARCH),cris)
 446         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 447         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 448         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 449         PICFLAG:=-fpic
 450         PIEFLAG_NAME:=-fpie
 451 endif
 452
 453 ifeq ($(TARGET_ARCH),m68k)
 454         # -fPIC is only supported for 68020 and above.  It is not supported
 455         # for 68000, 68010, or Coldfire.
 456         PICFLAG:=-fpic
 457         PIEFLAG_NAME:=-fpie
 458 endif
 459
 460 ifeq ($(TARGET_ARCH),powerpc)
 461 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 462 # enough. Therefore use -fpic which will reduce code size and generates
 463 # faster code.
 464         PICFLAG:=-fpic
 465         PIEFLAG_NAME:=-fpie
 466         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 467         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 468         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 469
 470 endif
 471
 472 ifeq ($(TARGET_ARCH),bfin)
 473         SYMBOL_PREFIX=_
 474 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 475         CPU_CFLAGS-y:=-mfdpic
 476         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 477         PICFLAG:=-fpic
 478         PIEFLAG_NAME:=-fpie
 479 endif
 480 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 481         PICFLAG := -mleaf-id-shared-library
 482 endif
 483 endif
 484
 485 ifeq ($(TARGET_ARCH),frv)
 486         # Using -pie causes the program to have an interpreter, which is
 487         # forbidden, so we must make do with -shared.  Unfortunately,
 488         # -shared by itself would get us global function descriptors
 489         # and calls through PLTs, dynamic resolution of symbols, etc,
 490         # which would break as well, but -Bsymbolic comes to the rescue.
 491         CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
 492 endif
 493
 494 ifeq ($(strip $(TARGET_ARCH)),avr32)
 495        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 496        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 497        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 498 endif
 499
 500 ifeq ($(TARGET_ARCH),c6x)
 501         PIEFLAG:=
 502         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 503         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 504         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 505         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 506         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 507 endif
 508
 509 ifeq ($(TARGET_ARCH),arc)
 510         CPU_CFLAGS-y += -mlock -mswape
 511         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 512         CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
 513         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 514 endif
 515
 516 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 517 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 518 ifeq ($(PIEFLAG),)
 519 PIEFLAG := $(PICFLAG)
 520 endif
 521 # We need to keep track of both the CC PIE flag (above) as
 522 # well as the LD PIE flag (below) because we can't rely on
 523 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 524 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 525 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 526
 527 # Check for --as-needed support in linker
 528 ifndef LD_FLAG_ASNEEDED
 529 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 530 ifneq ($(_LD_FLAG_ASNEEDED),)
 531 export LD_FLAG_ASNEEDED:=--as-needed
 532 endif
 533 endif
 534 ifndef LD_FLAG_NO_ASNEEDED
 535 ifdef LD_FLAG_ASNEEDED
 536 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 537 endif
 538 endif
 539 ifndef CC_FLAG_ASNEEDED
 540 ifdef LD_FLAG_ASNEEDED
 541 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 542 endif
 543 endif
 544 ifndef CC_FLAG_NO_ASNEEDED
 545 ifdef LD_FLAG_NO_ASNEEDED
 546 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 547 endif
 548 endif
 549 link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
 550
 551 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 552 ifndef ASNEEDED
 553 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 554
 555 # Only used in installed libc.so linker script
 556 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 557 ifeq ($(HARDWIRED_ABSPATH),y)
 558 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 559 else
 560 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 561 endif
 562 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 563         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 564         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 565 else
 566 export UBACKTRACE_ASNEEDED:=""
 567 endif
 568 ifeq ($(UCLIBC_HAS_ARGP),y)
 569 ifeq ($(HARDWIRED_ABSPATH),y)
 570 # Only used in installed libc.so linker script
 571 UARGP_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/libuargp.so.$(MAJOR_VERSION))
 572 else
 573 UARGP_FULL_NAME := libuargp.so.$(MAJOR_VERSION)
 574 endif
 575 export UARGP_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 576         echo "GROUP ( AS_NEEDED ( $(UARGP_FULL_NAME) ) )" || \
 577         echo "GROUP ( $(UARGP_FULL_NAME) )")
 578 else
 579 export UARGP_ASNEEDED:=""
 580 endif
 581 endif
 582
 583 # Add a bunch of extra pedantic annoyingly strict checks
 584 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 585 ifeq ($(EXTRA_WARNINGS),y)
 586 WARNING_FLAGS += \
 587         -Wformat=2 \
 588         -Wmissing-noreturn \
 589         -Wmissing-format-attribute \
 590         -Wmissing-prototypes \
 591         -Wmissing-declarations \
 592         -Wnested-externs \
 593         -Wnonnull \
 594         -Wold-style-declaration \
 595         -Wold-style-definition \
 596         -Wshadow \
 597         -Wundef
 598 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 599 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 600 endif
 601 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 602 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 603 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 604
 605 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 606
 607 # Save the tested flag in a single variable and force it to be
 608 # evaluated just once.  Then use that computed value.
 609 $(eval $(call check-gcc-var,-fno-stack-protector))
 610 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 611 ifeq ($(UCLIBC_BUILD_SSP),y)
 612 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 613 $(eval $(call check-gcc-var,-fstack-protector))
 614 $(eval $(call check-gcc-var,-fstack-protector-all))
 615 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 616 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 617 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 618 else
 619 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 620 endif
 621
 622 # Collect all CFLAGS components
 623 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 624         -nostdinc -I$(top_builddir)include \
 625         -I$(top_srcdir)include -include libc-symbols.h \
 626         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 627         -I$(top_srcdir)libc/sysdeps/linux \
 628         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 629         -I$(top_srcdir)ldso/include -I.
 630
 631 # We need this to be checked within libc-symbols.h
 632 ifneq ($(HAVE_SHARED),y)
 633 CFLAGS += -DSTATIC
 634 endif
 635
 636 $(eval $(call check-ld-var,--warn-once))
 637 $(eval $(call check-ld-var,--sort-common))
 638 $(eval $(call check-ld-var,--discard-all))
 639 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 640         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 641 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 642 #$(eval $(call check-ld-var,--gc-sections))
 643 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 644
 645 ifeq ($(UCLIBC_BUILD_RELRO),y)
 646 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 647 endif
 648
 649 ifeq ($(UCLIBC_BUILD_NOW),y)
 650 LDFLAGS_NOSTRIP+=-Wl,-z,now
 651 endif
 652
 653 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 654 # Be sure that binutils support it
 655 $(eval $(call check-ld-var,--hash-style=gnu))
 656 ifeq ($(LDFLAG_--hash-style=gnu),)
 657 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 658 $(error Your binutils do not support --hash-style option, while you want to use it)
 659 endif
 660 else
 661 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 662 endif
 663 endif
 664
 665 ifeq ($(DODEBUG),y)
 666 CFLAGS += -O0 -g3 -DDEBUG
 667 else
 668 CFLAGS += $(OPTIMIZATION)
 669 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 670 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 671 $(eval $(call check-ld-var,-O2))
 672 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 673 endif
 674
 675 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 676
 677 ifeq ($(DOSTRIP),y)
 678 LDFLAGS += -Wl,-s
 679 else
 680 STRIPTOOL := true -Stripping_disabled
 681 endif
 682
 683 ifeq ($(DOMULTI),y)
 684 # we try to compile all sources at once into an object (IMA), but
 685 # gcc-3.3.x does not support it
 686 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 687 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 688 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 689 ifeq ($(GCC_MAJOR_VER),3)
 690 DOMULTI:=n
 691 else
 692 $(eval $(call check-gcc-var,--combine))
 693 CFLAGS += $(CFLAG_--combine)
 694 endif
 695 else
 696 DOMULTI:=n
 697 endif
 698
 699 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 700 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 701 endif
 702 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 703 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 704 endif
 705
 706 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 707 CFLAGS += -D__USE_STDIO_FUTEXES__
 708 endif
 709
 710 ifeq ($(UCLIBC_HAS_THREADS),y)
 711 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 712         PTNAME := nptl
 713         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 714 else
 715 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
 716         PTNAME := linuxthreads
 717 endif
 718 endif
 719 PTDIR := libpthread/$(PTNAME)
 720 # set up system dependencies include dirs (NOTE: order matters!)
 721 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 722 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 723         -I$(top_srcdir)$(PTDIR)                                         \
 724         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 725         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 726         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 727         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 728         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 729         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 730         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 731         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 732         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 733 #
 734 # Test for TLS if NPTL support was selected.
 735 #
 736 GCC_HAS_TLS=$(shell \
 737         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 738 ifneq ($(GCC_HAS_TLS),)
 739 gcc_tls_test_fail:
 740         @echo "####";
 741         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 742         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 743         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 744         @echo "#### about this problem.";
 745         @echo "####";
 746         @echo "#### Exiting...";
 747         @echo "####";
 748         @exit 1;
 749 endif
 750 else
 751 PTINC := \
 752         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 753         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 754         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 755         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 756         -I$(top_srcdir)$(PTDIR) \
 757         -I$(top_srcdir)libpthread
 758 endif
 759 CFLAGS+=$(PTINC)
 760 else
 761         PTNAME :=
 762         PTINC  :=
 763 endif
 764 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 765
 766 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 767 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 768 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 769 CFLAGS += $(CC_INC)
 770
 771 CFLAGS += -I$(KERNEL_HEADERS)
 772
 773 ifneq ($(DOASSERTS),y)
 774 CFLAGS+=-DNDEBUG
 775 endif
 776
 777 ifeq ($(SYMBOL_PREFIX),_)
 778 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 779 endif
 780
 781 # Keep the check_as from being needlessly executed
 782 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 783 $(eval $(call check-as-var,--noexecstack))
 784 endif
 785 ASFLAGS += $(ASFLAG_--noexecstack)
 786
 787 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 788 $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 789 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 790 # with -O0 we (e.g. lockf) might end up with references to
 791 # _Unwind_Resume, so pull in gcc_eh in this case..
 792 # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
 793 # in libgcc.a, so check if the printed file exist, before adding to the commandline
 794 LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
 795 LIBGCC_DIR := $(dir $(LIBGCC_A))
 796 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
 797
 798 # moved from libpthread/linuxthreads
 799 ifeq ($(UCLIBC_CTOR_DTOR),y)
 800 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 801 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 802 endif
 803
 804 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 805
 806 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"