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 sub_headers := $(headers_dep)
 170
 171 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 172 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 173
 174 # Make sure DESTDIR and PREFIX can be used to install
 175 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 176 ifndef PREFIX
 177 PREFIX = $(DESTDIR)
 178 endif
 179
 180 ifneq ($(HAVE_SHARED),y)
 181 libc :=
 182 interp :=
 183 ldso :=
 184 endif
 185
 186 comma:=,
 187 space:= #
 188
 189 ifeq ($(CROSS_COMPILE),)
 190 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 191 endif
 192
 193 # A nifty macro to make testing gcc features easier
 194 check_gcc=$(shell \
 195         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 196         then echo "$(1)"; else echo "$(2)"; fi)
 197 check_as=$(shell \
 198         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 199         then echo "-Wa,$(1)"; fi)
 200 check_ld=$(shell \
 201         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 202         then echo "$(1)"; fi)
 203
 204 # Use variable indirection here so that we can have variable
 205 # names with fun chars in them like equal signs
 206 define check-tool-var
 207 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 208 _v = $(2)_$(3)
 209 ifndef $$(_v)
 210 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 211 export $$(_v)
 212 endif
 213 endif
 214 endef
 215
 216 # Usage: check-gcc-var,<flag>
 217 # Check the C compiler to see if it supports <flag>.
 218 # Export the variable CFLAG_<flag> if it does.
 219 define check-gcc-var
 220 $(call check-tool-var,check_gcc,CFLAG,$(1))
 221 endef
 222 # Usage: check-as-var,<flag>
 223 # Check the assembler to see if it supports <flag>.  Export the
 224 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 225 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 226 define check-as-var
 227 $(call check-tool-var,check_as,ASFLAG,$(1))
 228 _v = CFLAG_-Wa$(1)
 229 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 230 endef
 231 # Usage: check-ld-var,<flag>
 232 # Check the linker to see if it supports <flag>.  Export the
 233 # variable LDFLAG_<flag> if it does (for invoking the linker),
 234 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 235 define check-ld-var
 236 $(call check-tool-var,check_ld,LDFLAG,$(1))
 237 _v = CFLAG_-Wl$(1)
 238 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 239 endef
 240 # Usage: cache-output-var,<variable>,<shell command>
 241 # Execute <shell command> and cache the output in <variable>.
 242 define cache-output-var
 243 ifndef $(1)
 244 $(1) := $$(shell $(2))
 245 export $(1)
 246 endif
 247 endef
 248
 249
 250 ARFLAGS:=cr
 251
 252 # Note: The check for -nostdlib has to be before all calls to check_ld
 253 $(eval $(call check-gcc-var,-nostdlib))
 254 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 255 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 256 # failed to merge target specific data of file /dev/null
 257 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 258 $(eval $(call check-ld-var,--no-warn-mismatch))
 259
 260 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 261 GCC_VER := $(subst ., ,$(GCC_VER))
 262 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 263 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 264
 265 # Flags in OPTIMIZATION are used only for non-debug builds
 266
 267 OPTIMIZATION:=
 268 OPTIMIZATION-$(GCC_MAJOR_VER):=
 269 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 270
 271 # Use '-Os' optimization if available, else use -O2, allow Config to override
 272 $(eval $(call check-gcc-var,-Os))
 273 ifneq ($(CFLAG_-Os),)
 274 OPTIMIZATION += $(CFLAG_-Os)
 275 else
 276 $(eval $(call check-gcc-var,-O2))
 277 OPTIMIZATION += $(CFLAG_-O2)
 278 endif
 279 # Use the gcc 3.4 -funit-at-a-time optimization when available
 280 $(eval $(call check-gcc-var,-funit-at-a-time))
 281 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 282 $(eval $(call check-gcc-var,-fstrict-aliasing))
 283 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 284
 285 # CPU_CFLAGS-y contain options which are not warnings,
 286 # not include or library paths, and not optimizations.
 287
 288 # Why -funsigned-char: I hunted a bug related to incorrect
 289 # sign extension of 'char' type for 10 hours straight. Not fun.
 290 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 291
 292 $(eval $(call check-gcc-var,-fno-asm))
 293 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 294
 295 LDADD_LIBFLOAT=
 296 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 297 # If -msoft-float isn't supported, we want an error anyway.
 298 # Hmm... might need to revisit this for arm since it has 2 different
 299 # soft float encodings.
 300 ifneq ($(TARGET_ARCH),nios)
 301 ifneq ($(TARGET_ARCH),nios2)
 302 ifneq ($(TARGET_ARCH),sh)
 303 ifneq ($(TARGET_ARCH),c6x)
 304 CPU_CFLAGS-y += -msoft-float
 305 endif
 306 endif
 307 endif
 308 endif
 309 ifeq ($(TARGET_ARCH),arm)
 310 # No longer needed with current toolchains, but leave it here for now.
 311 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
 312 #    LDADD_LIBFLOAT=-lfloat
 313 endif
 314 endif
 315
 316 $(eval $(call check-gcc-var,-std=gnu99))
 317 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 318
 319 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 320 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 321
 322 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 323 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 324
 325 PICFLAG-y := -fPIC
 326 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 327 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 328 PICFLAG := $(PICFLAG-y)
 329 PIEFLAG_NAME:=-fPIE
 330
 331 # Some nice CPU specific optimizations
 332 ifeq ($(TARGET_ARCH),i386)
 333 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 334         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 335
 336 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 337         # TODO: Change this to a gcc version check.  This bug
 338         # should be fixed with at least gcc-4.3.
 339         # Non-SSE capable processor.
 340         # NB: this may make SSE insns segfault!
 341         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 342         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 343         # -m32 is needed if host is 64-bit
 344         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 345 else
 346 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 347         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 348 endif
 349
 350         # Choice of alignment (please document why!)
 351         #  -falign-labels: in-line labels
 352         #  (reachable by normal code flow, aligning will insert nops
 353         #  which will be executed - may even make things slower)
 354         #  -falign-jumps: reachable only by a jump
 355         # Generic: no alignment at all (smallest code)
 356         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 357         OPTIMIZATION+=$(GCC_FALIGN)
 358
 359         # Putting each function and data object into its own section
 360         # allows for kbytes of less text if users link against static uclibc
 361         # using ld --gc-sections.
 362         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 363         # do not use --gc-sections at shared lib link time.
 364         # However, in combination with sections being sorted by alignment
 365         # it does result in much reduced padding:
 366         #   text    data     bss     dec     hex
 367         # 235319    1472    5992  242783   3b45f old.so
 368         # 234104    1472    5980  241556   3af94 new.so
 369         # Without -ffunction-sections, all functions will get aligned
 370         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 371         # It specifies 4 byte align for .text even if not told to do so:
 372         # Idx Name          Size      VMA       LMA       File off  Algn
 373         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 374         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 375         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 376 $(eval $(call check-ld-var,--sort-section=alignment))
 377         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 378
 379         CPU_LDFLAGS-y+=-m32
 380         CPU_CFLAGS-y+=-m32
 381 endif
 382
 383 ifeq ($(TARGET_ARCH),sparc)
 384         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 385         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 386         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 387         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 388 endif
 389
 390 ifeq ($(TARGET_ARCH),arm)
 391         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 392         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 393         CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
 394 endif
 395
 396 ifeq ($(TARGET_ARCH),metag)
 397         SYMBOL_PREFIX=_
 398         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 399         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 400 endif
 401
 402 ifeq ($(TARGET_ARCH),mips)
 403         OPTIMIZATION+=-mno-split-addresses
 404         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 405         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 406         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 407         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 408 endif
 409
 410 ifeq ($(TARGET_ARCH),nios)
 411         OPTIMIZATION+=-funaligned-struct-hack
 412         CPU_LDFLAGS-y+=-Wl,-m32
 413         CPU_CFLAGS-y+=-Wl,-m32
 414 endif
 415
 416 ifeq ($(TARGET_ARCH),sh)
 417 $(eval $(call check-gcc-var,-mprefergot))
 418         OPTIMIZATION += $(CFLAG_-mprefergot)
 419         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 420         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 421         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 422         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 423 ifeq ($(UCLIBC_HAS_FPU),y)
 424         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 425         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 426 else
 427         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 428         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 429 endif
 430 endif
 431
 432 ifeq ($(TARGET_ARCH),sh64)
 433         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 434         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 435         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 436 endif
 437
 438 ifeq ($(TARGET_ARCH),h8300)
 439         SYMBOL_PREFIX=_
 440         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
 441         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-ms8300s
 442         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 443         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 444 endif
 445
 446 ifeq ($(TARGET_ARCH),i960)
 447         OPTIMIZATION+=-mh -mint32 #-fsigned-char
 448 endif
 449
 450 ifeq ($(TARGET_ARCH),e1)
 451         OPTIMIZATION+=-mgnu-param
 452 endif
 453
 454 ifeq ($(TARGET_ARCH),cris)
 455         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 456         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 457         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 458         PICFLAG:=-fpic
 459         PIEFLAG_NAME:=-fpie
 460 endif
 461
 462 ifeq ($(TARGET_ARCH),m68k)
 463         # -fPIC is only supported for 68020 and above.  It is not supported
 464         # for 68000, 68010, or Coldfire.
 465         PICFLAG:=-fpic
 466         PIEFLAG_NAME:=-fpie
 467 endif
 468
 469 ifeq ($(TARGET_ARCH),powerpc)
 470 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 471 # enough. Therefore use -fpic which will reduce code size and generates
 472 # faster code.
 473         PICFLAG:=-fpic
 474         PIEFLAG_NAME:=-fpie
 475         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 476         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 477         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 478
 479 endif
 480
 481 ifeq ($(TARGET_ARCH),bfin)
 482         SYMBOL_PREFIX=_
 483 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 484         CPU_CFLAGS-y:=-mfdpic
 485         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 486         PICFLAG:=-fpic
 487         PIEFLAG_NAME:=-fpie
 488 endif
 489 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 490         PICFLAG := -mleaf-id-shared-library
 491 endif
 492 endif
 493
 494 ifeq ($(TARGET_ARCH),frv)
 495         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 496         # Using -pie causes the program to have an interpreter, which is
 497         # forbidden, so we must make do with -shared.  Unfortunately,
 498         # -shared by itself would get us global function descriptors
 499         # and calls through PLTs, dynamic resolution of symbols, etc,
 500         # which would break as well, but -Bsymbolic comes to the rescue.
 501         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 502         UCLIBC_LDSO=ld.so.1
 503 endif
 504
 505 ifeq ($(strip $(TARGET_ARCH)),avr32)
 506        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 507        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 508        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 509 endif
 510
 511 ifeq ($(TARGET_ARCH),i960)
 512       SYMBOL_PREFIX=_
 513 endif
 514
 515 ifeq ($(TARGET_ARCH),v850)
 516       SYMBOL_PREFIX=_
 517 endif
 518
 519 ifeq ($(TARGET_ARCH),c6x)
 520         PIEFLAG:=
 521         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 522         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 523         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 524         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 525         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 526 endif
 527
 528 ifeq ($(TARGET_ARCH),arc)
 529         CPU_CFLAGS-y += -mlock -mswape
 530         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 531         CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
 532         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 533 endif
 534
 535 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 536 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 537 ifeq ($(PIEFLAG),)
 538 PIEFLAG := $(PICFLAG)
 539 endif
 540 # We need to keep track of both the CC PIE flag (above) as
 541 # well as the LD PIE flag (below) because we can't rely on
 542 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 543 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 544 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 545
 546 # Check for --as-needed support in linker
 547 ifndef LD_FLAG_ASNEEDED
 548 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 549 ifneq ($(_LD_FLAG_ASNEEDED),)
 550 export LD_FLAG_ASNEEDED:=--as-needed
 551 endif
 552 endif
 553 ifndef LD_FLAG_NO_ASNEEDED
 554 ifdef LD_FLAG_ASNEEDED
 555 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 556 endif
 557 endif
 558 ifndef CC_FLAG_ASNEEDED
 559 ifdef LD_FLAG_ASNEEDED
 560 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 561 endif
 562 endif
 563 ifndef CC_FLAG_NO_ASNEEDED
 564 ifdef LD_FLAG_NO_ASNEEDED
 565 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 566 endif
 567 endif
 568 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 569
 570 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 571 ifndef ASNEEDED
 572 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 573
 574 # Only used in installed libc.so linker script
 575 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 576 ifeq ($(HARDWIRED_ABSPATH),y)
 577 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 578 else
 579 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 580 endif
 581 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 582         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 583         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 584 else
 585 export UBACKTRACE_ASNEEDED:=""
 586 endif
 587 endif
 588
 589 # Add a bunch of extra pedantic annoyingly strict checks
 590 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 591 ifeq ($(EXTRA_WARNINGS),y)
 592 WARNING_FLAGS += \
 593         -Wformat=2 \
 594         -Wmissing-noreturn \
 595         -Wmissing-format-attribute \
 596         -Wmissing-prototypes \
 597         -Wmissing-declarations \
 598         -Wnested-externs \
 599         -Wnonnull \
 600         -Wold-style-declaration \
 601         -Wold-style-definition \
 602         -Wshadow \
 603         -Wundef
 604 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 605 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 606 endif
 607 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 608 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 609 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 610
 611 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 612
 613 # Save the tested flag in a single variable and force it to be
 614 # evaluated just once.  Then use that computed value.
 615 $(eval $(call check-gcc-var,-fno-stack-protector))
 616 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 617 ifeq ($(UCLIBC_BUILD_SSP),y)
 618 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 619 $(eval $(call check-gcc-var,-fstack-protector))
 620 $(eval $(call check-gcc-var,-fstack-protector-all))
 621 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 622 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 623 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 624 else
 625 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 626 endif
 627
 628 # Collect all CFLAGS components
 629 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 630         -nostdinc -I$(top_builddir)include \
 631         -I$(top_srcdir)include -include libc-symbols.h \
 632         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 633         -I$(top_srcdir)libc/sysdeps/linux \
 634         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 635         -I$(top_srcdir)ldso/include -I.
 636
 637 # We need this to be checked within libc-symbols.h
 638 ifneq ($(HAVE_SHARED),y)
 639 CFLAGS += -DSTATIC
 640 endif
 641
 642 $(eval $(call check-ld-var,--warn-once))
 643 $(eval $(call check-ld-var,--sort-common))
 644 $(eval $(call check-ld-var,--discard-all))
 645 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 646         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 647 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 648 #$(eval $(call check-ld-var,--gc-sections))
 649 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 650
 651 $(eval $(call check-gcc-var,-fdata-sections))
 652 $(eval $(call check-gcc-var,-ffunction-sections))
 653
 654 ifeq ($(UCLIBC_BUILD_RELRO),y)
 655 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 656 endif
 657
 658 ifeq ($(UCLIBC_BUILD_NOW),y)
 659 LDFLAGS_NOSTRIP+=-Wl,-z,now
 660 endif
 661
 662 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 663 # Be sure that binutils support it
 664 $(eval $(call check-ld-var,--hash-style=gnu))
 665 ifeq ($(LDFLAG_--hash-style=gnu),)
 666 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 667 $(error Your binutils do not support --hash-style option, while you want to use it)
 668 endif
 669 else
 670 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 671 endif
 672 endif
 673
 674 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 675 ifeq ($(DODEBUG),y)
 676 CFLAGS += -O0 -g3 -DDEBUG
 677 else
 678 CFLAGS += $(OPTIMIZATION)
 679 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 680 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 681 endif
 682 ifeq ($(DOSTRIP),y)
 683 LDFLAGS += -Wl,-s
 684 else
 685 STRIPTOOL := true -Stripping_disabled
 686 endif
 687
 688 ifeq ($(DOMULTI),y)
 689 # we try to compile all sources at once into an object (IMA), but
 690 # gcc-3.3.x does not support it
 691 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 692 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 693 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 694 ifeq ($(GCC_MAJOR_VER),3)
 695 DOMULTI:=n
 696 else
 697 $(eval $(call check-gcc-var,--combine))
 698 CFLAGS += $(CFLAG_--combine)
 699 endif
 700 else
 701 DOMULTI:=n
 702 endif
 703
 704 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 705 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 706 endif
 707 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 708 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 709 endif
 710
 711 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 712 CFLAGS += -D__USE_STDIO_FUTEXES__
 713 endif
 714
 715 ifeq ($(UCLIBC_HAS_THREADS),y)
 716 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 717         PTNAME := nptl
 718         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 719 else
 720 ifeq ($(LINUXTHREADS_OLD),y)
 721         PTNAME := linuxthreads.old
 722 else
 723         PTNAME := linuxthreads
 724 endif
 725 endif
 726 PTDIR := libpthread/$(PTNAME)
 727 # set up system dependencies include dirs (NOTE: order matters!)
 728 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 729 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 730         -I$(top_srcdir)$(PTDIR)                                         \
 731         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 732         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 733         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 734         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 735         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 736         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 737         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 738         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 739         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 740 #
 741 # Test for TLS if NPTL support was selected.
 742 #
 743 GCC_HAS_TLS=$(shell \
 744         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 745 ifneq ($(GCC_HAS_TLS),)
 746 gcc_tls_test_fail:
 747         @echo "####";
 748         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 749         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 750         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 751         @echo "#### about this problem.";
 752         @echo "####";
 753         @echo "#### Exiting...";
 754         @echo "####";
 755         @exit 1;
 756 endif
 757 else
 758 PTINC := \
 759         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 760         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 761         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 762         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 763         -I$(top_srcdir)$(PTDIR) \
 764         -I$(top_srcdir)libpthread
 765 endif
 766 CFLAGS+=$(PTINC)
 767 else
 768         PTNAME :=
 769         PTINC  :=
 770 endif
 771 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 772
 773 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 774 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 775 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 776 CFLAGS += $(CC_INC)
 777
 778 CFLAGS += -I$(KERNEL_HEADERS)
 779
 780 ifneq ($(DOASSERTS),y)
 781 CFLAGS+=-DNDEBUG
 782 endif
 783
 784 ifeq ($(SYMBOL_PREFIX),_)
 785 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 786 endif
 787
 788 # Keep the check_as from being needlessly executed
 789 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 790 $(eval $(call check-as-var,--noexecstack))
 791 endif
 792 ASFLAGS += $(ASFLAG_--noexecstack)
 793
 794 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 795 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 796 LIBGCC_DIR:=$(dir $(LIBGCC))
 797
 798 # moved from libpthread/linuxthreads
 799 ifeq ($(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"