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      := 2
 130 EXTRAVERSION  :=
 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 $(eval $(call check-gcc-var,-nostartfiles))
 256 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 257 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 258 # failed to merge target specific data of file /dev/null
 259 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 260 $(eval $(call check-ld-var,--no-warn-mismatch))
 261
 262 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 263 GCC_VER := $(subst ., ,$(GCC_VER))
 264 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 265 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 266
 267 # Flags in OPTIMIZATION are used only for non-debug builds
 268
 269 OPTIMIZATION:=
 270 OPTIMIZATION-$(GCC_MAJOR_VER):=
 271 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 272
 273 # Use '-Os' optimization if available, else use -O2, allow Config to override
 274 $(eval $(call check-gcc-var,-Os))
 275 ifneq ($(CFLAG_-Os),)
 276 OPTIMIZATION += $(CFLAG_-Os)
 277 else
 278 $(eval $(call check-gcc-var,-O2))
 279 OPTIMIZATION += $(CFLAG_-O2)
 280 endif
 281 # Use the gcc 3.4 -funit-at-a-time optimization when available
 282 $(eval $(call check-gcc-var,-funit-at-a-time))
 283 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 284 $(eval $(call check-gcc-var,-fstrict-aliasing))
 285 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 286
 287 # CPU_CFLAGS-y contain options which are not warnings,
 288 # not include or library paths, and not optimizations.
 289
 290 # Why -funsigned-char: I hunted a bug related to incorrect
 291 # sign extension of 'char' type for 10 hours straight. Not fun.
 292 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 293
 294 $(eval $(call check-gcc-var,-fno-asm))
 295 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 296 $(eval $(call check-gcc-var,-fmerge-all-constants))
 297 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 298
 299 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 300 ifneq ($(TARGET_ARCH),bfin)
 301 ifneq ($(TARGET_ARCH),nios2)
 302 ifneq ($(TARGET_ARCH),sh)
 303 ifneq ($(TARGET_ARCH),c6x)
 304 ifneq ($(TARGET_ARCH),h8300)
 305 CPU_CFLAGS-y += -msoft-float
 306 endif
 307 endif
 308 endif
 309 endif
 310 endif
 311 endif
 312
 313 $(eval $(call check-gcc-var,-std=gnu99))
 314 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 315
 316 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 317 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 318
 319 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 320 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 321
 322 PICFLAG-y := -fPIC
 323 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 324 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 325 PICFLAG := $(PICFLAG-y)
 326 PIEFLAG_NAME:=-fPIE
 327
 328 # Some nice CPU specific optimizations
 329 ifeq ($(TARGET_ARCH),i386)
 330 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 331         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 332
 333 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 334         # TODO: Change this to a gcc version check.  This bug
 335         # should be fixed with at least gcc-4.3.
 336         # Non-SSE capable processor.
 337         # NB: this may make SSE insns segfault!
 338         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 339         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 340         # -m32 is needed if host is 64-bit
 341         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 342 else
 343 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 344         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 345 endif
 346
 347         # Choice of alignment (please document why!)
 348         #  -falign-labels: in-line labels
 349         #  (reachable by normal code flow, aligning will insert nops
 350         #  which will be executed - may even make things slower)
 351         #  -falign-jumps: reachable only by a jump
 352         # Generic: no alignment at all (smallest code)
 353         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 354         OPTIMIZATION+=$(GCC_FALIGN)
 355
 356         # Putting each function and data object into its own section
 357         # allows for kbytes of less text if users link against static uclibc
 358         # using ld --gc-sections.
 359         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 360         # do not use --gc-sections at shared lib link time.
 361         # However, in combination with sections being sorted by alignment
 362         # it does result in much reduced padding:
 363         #   text    data     bss     dec     hex
 364         # 235319    1472    5992  242783   3b45f old.so
 365         # 234104    1472    5980  241556   3af94 new.so
 366         # Without -ffunction-sections, all functions will get aligned
 367         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 368         # It specifies 4 byte align for .text even if not told to do so:
 369         # Idx Name          Size      VMA       LMA       File off  Algn
 370         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 371         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 372         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 373 $(eval $(call check-ld-var,--sort-section=alignment))
 374         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 375
 376         CPU_LDFLAGS-y+=-m32
 377         CPU_CFLAGS-y+=-m32
 378 endif
 379
 380 ifeq ($(TARGET_ARCH),sparc)
 381         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 382         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 383         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 384         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 385 endif
 386
 387 ifeq ($(TARGET_ARCH),arm)
 388         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 389         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 390         CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
 391 endif
 392
 393 ifeq ($(TARGET_ARCH),metag)
 394         SYMBOL_PREFIX=_
 395         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 396         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 397 endif
 398
 399 ifeq ($(TARGET_ARCH),mips)
 400         OPTIMIZATION+=-mno-split-addresses
 401         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 402         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 403         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 404         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 405 endif
 406
 407 ifeq ($(TARGET_ARCH),nios)
 408         OPTIMIZATION+=-funaligned-struct-hack
 409         CPU_LDFLAGS-y+=-Wl,-m32
 410         CPU_CFLAGS-y+=-Wl,-m32
 411 endif
 412
 413 ifeq ($(TARGET_ARCH),sh)
 414 $(eval $(call check-gcc-var,-mprefergot))
 415         OPTIMIZATION += $(CFLAG_-mprefergot)
 416         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 417         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 418         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 419         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 420 ifeq ($(UCLIBC_HAS_FPU),y)
 421         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 422         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 423 else
 424         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 425         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 426 endif
 427 endif
 428
 429 ifeq ($(TARGET_ARCH),sh64)
 430         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 431         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 432         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 433 endif
 434
 435 ifeq ($(TARGET_ARCH),h8300)
 436         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-mh8300h_linux
 437         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-mh8300s_linux
 438         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 439         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 440 endif
 441
 442 ifeq ($(TARGET_ARCH),i960)
 443         OPTIMIZATION+=-mh -mint32 #-fsigned-char
 444 endif
 445
 446 ifeq ($(TARGET_ARCH),e1)
 447         OPTIMIZATION+=-mgnu-param
 448 endif
 449
 450 ifeq ($(TARGET_ARCH),cris)
 451         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 452         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 453         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 454         PICFLAG:=-fpic
 455         PIEFLAG_NAME:=-fpie
 456 endif
 457
 458 ifeq ($(TARGET_ARCH),m68k)
 459         # -fPIC is only supported for 68020 and above.  It is not supported
 460         # for 68000, 68010, or Coldfire.
 461         PICFLAG:=-fpic
 462         PIEFLAG_NAME:=-fpie
 463 endif
 464
 465 ifeq ($(TARGET_ARCH),powerpc)
 466 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 467 # enough. Therefore use -fpic which will reduce code size and generates
 468 # faster code.
 469         PICFLAG:=-fpic
 470         PIEFLAG_NAME:=-fpie
 471         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 472         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 473         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 474
 475 endif
 476
 477 ifeq ($(TARGET_ARCH),bfin)
 478         SYMBOL_PREFIX=_
 479 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 480         CPU_CFLAGS-y:=-mfdpic
 481         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 482         PICFLAG:=-fpic
 483         PIEFLAG_NAME:=-fpie
 484 endif
 485 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 486         PICFLAG := -mleaf-id-shared-library
 487 endif
 488 endif
 489
 490 ifeq ($(TARGET_ARCH),frv)
 491         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 492         # Using -pie causes the program to have an interpreter, which is
 493         # forbidden, so we must make do with -shared.  Unfortunately,
 494         # -shared by itself would get us global function descriptors
 495         # and calls through PLTs, dynamic resolution of symbols, etc,
 496         # which would break as well, but -Bsymbolic comes to the rescue.
 497         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 498         UCLIBC_LDSO=ld.so.1
 499 endif
 500
 501 ifeq ($(strip $(TARGET_ARCH)),avr32)
 502        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 503        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 504        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 505 endif
 506
 507 ifeq ($(TARGET_ARCH),i960)
 508       SYMBOL_PREFIX=_
 509 endif
 510
 511 ifeq ($(TARGET_ARCH),v850)
 512       SYMBOL_PREFIX=_
 513 endif
 514
 515 ifeq ($(TARGET_ARCH),c6x)
 516         PIEFLAG:=
 517         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 518         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 519         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 520         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 521         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 522 endif
 523
 524 ifeq ($(TARGET_ARCH),arc)
 525         CPU_CFLAGS-y += -mlock -mswape
 526         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 527         CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
 528         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 529 endif
 530
 531 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 532 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 533 ifeq ($(PIEFLAG),)
 534 PIEFLAG := $(PICFLAG)
 535 endif
 536 # We need to keep track of both the CC PIE flag (above) as
 537 # well as the LD PIE flag (below) because we can't rely on
 538 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 539 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 540 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 541
 542 # Check for --as-needed support in linker
 543 ifndef LD_FLAG_ASNEEDED
 544 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 545 ifneq ($(_LD_FLAG_ASNEEDED),)
 546 export LD_FLAG_ASNEEDED:=--as-needed
 547 endif
 548 endif
 549 ifndef LD_FLAG_NO_ASNEEDED
 550 ifdef LD_FLAG_ASNEEDED
 551 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 552 endif
 553 endif
 554 ifndef CC_FLAG_ASNEEDED
 555 ifdef LD_FLAG_ASNEEDED
 556 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 557 endif
 558 endif
 559 ifndef CC_FLAG_NO_ASNEEDED
 560 ifdef LD_FLAG_NO_ASNEEDED
 561 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 562 endif
 563 endif
 564 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 565
 566 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 567 ifndef ASNEEDED
 568 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 569
 570 # Only used in installed libc.so linker script
 571 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 572 ifeq ($(HARDWIRED_ABSPATH),y)
 573 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 574 else
 575 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 576 endif
 577 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 578         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 579         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 580 else
 581 export UBACKTRACE_ASNEEDED:=""
 582 endif
 583 endif
 584
 585 # Add a bunch of extra pedantic annoyingly strict checks
 586 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 587 ifeq ($(EXTRA_WARNINGS),y)
 588 WARNING_FLAGS += \
 589         -Wformat=2 \
 590         -Wmissing-noreturn \
 591         -Wmissing-format-attribute \
 592         -Wmissing-prototypes \
 593         -Wmissing-declarations \
 594         -Wnested-externs \
 595         -Wnonnull \
 596         -Wold-style-declaration \
 597         -Wold-style-definition \
 598         -Wshadow \
 599         -Wundef
 600 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 601 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 602 endif
 603 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 604 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 605 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 606
 607 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 608
 609 # Save the tested flag in a single variable and force it to be
 610 # evaluated just once.  Then use that computed value.
 611 $(eval $(call check-gcc-var,-fno-stack-protector))
 612 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 613 ifeq ($(UCLIBC_BUILD_SSP),y)
 614 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 615 $(eval $(call check-gcc-var,-fstack-protector))
 616 $(eval $(call check-gcc-var,-fstack-protector-all))
 617 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 618 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 619 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 620 else
 621 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 622 endif
 623
 624 # Collect all CFLAGS components
 625 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 626         -nostdinc -I$(top_builddir)include \
 627         -I$(top_srcdir)include -include libc-symbols.h \
 628         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 629         -I$(top_srcdir)libc/sysdeps/linux \
 630         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 631         -I$(top_srcdir)ldso/include -I.
 632
 633 # We need this to be checked within libc-symbols.h
 634 ifneq ($(HAVE_SHARED),y)
 635 CFLAGS += -DSTATIC
 636 endif
 637
 638 $(eval $(call check-ld-var,--warn-once))
 639 $(eval $(call check-ld-var,--sort-common))
 640 $(eval $(call check-ld-var,--discard-all))
 641 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 642         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 643 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 644 #$(eval $(call check-ld-var,--gc-sections))
 645 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 646
 647 $(eval $(call check-gcc-var,-fdata-sections))
 648 $(eval $(call check-gcc-var,-ffunction-sections))
 649
 650 ifeq ($(UCLIBC_BUILD_RELRO),y)
 651 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 652 endif
 653
 654 ifeq ($(UCLIBC_BUILD_NOW),y)
 655 LDFLAGS_NOSTRIP+=-Wl,-z,now
 656 endif
 657
 658 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 659 # Be sure that binutils support it
 660 $(eval $(call check-ld-var,--hash-style=gnu))
 661 ifeq ($(LDFLAG_--hash-style=gnu),)
 662 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 663 $(error Your binutils do not support --hash-style option, while you want to use it)
 664 endif
 665 else
 666 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 667 endif
 668 endif
 669
 670 ifeq ($(DODEBUG),y)
 671 CFLAGS += -O0 -g3 -DDEBUG
 672 else
 673 CFLAGS += $(OPTIMIZATION)
 674 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 675 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 676 $(eval $(call check-ld-var,-O2))
 677 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 678 endif
 679
 680 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 681
 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 $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 796 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 797 # with -O0 we (e.g. lockf) might end up with references to
 798 # _Unwind_Resume, so pull in gcc_eh in this case..
 799 LIBGCC_DIR := $(dir $(LIBGCC_A))
 800 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH))
 801
 802 # moved from libpthread/linuxthreads
 803 ifeq ($(UCLIBC_CTOR_DTOR),y)
 804 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 805 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 806 endif
 807
 808 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 809
 810 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"