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 ## unused? if yes, remove after 0.9.31
  71 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  72
  73 # Select the compiler needed to build binaries for your development system
  74 HOSTCC     = gcc
  75 BUILD_CFLAGS = -Os
  76
  77 #---------------------------------------------------------
  78 # Nothing beyond this point should ever be touched by mere
  79 # mortals.  Unless you hang out with the gods, you should
  80 # probably leave all this stuff alone.
  81
  82 # strip quotes
  83 qstrip = $(strip $(subst ",,$(1)))
  84 #"))
  85
  86 # kconfig stuff
  87 KCONFIG_CONFIG ?= $(top_builddir).config
  88 KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  89 export KCONFIG_CONFIG
  90 KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  91 export KCONFIG_AUTOCONFIG
  92 KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  93 export KCONFIG_TRISTATE
  94 srctree := $(abspath $(top_srcdir))
  95 export srctree
  96 KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  97 export KCONFIG_AUTOHEADER
  98 Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  99
 100 # Pull in the user's uClibc configuration
 101 ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
 102 -include $(KCONFIG_CONFIG)
 103 endif
 104
 105 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
 106 ifeq ($(TARGET_ARCH),)
 107 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
 108                                   -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
 109                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 110                                   -e s/sh.*/sh/ \
 111                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
 112                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 113                                   -e s/xtensa.*/xtensa/ )
 114 else
 115 ARCH = $(TARGET_ARCH)
 116 endif
 117 export ARCH
 118
 119 # Make certain these contain a final "/", but no "//"s.
 120 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
 121 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
 122 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
 123 DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
 124 MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
 125 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
 126 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
 127
 128
 129 # Now config hard core
 130 MAJOR_VERSION := 0
 131 MINOR_VERSION := 9
 132 SUBLEVEL      := 34
 133 EXTRAVERSION  :=-git
 134 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 135 ABI_VERSION   := $(MAJOR_VERSION)
 136 ifneq ($(EXTRAVERSION),)
 137 VERSION       := $(VERSION)$(EXTRAVERSION)
 138 endif
 139 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 140 LC_ALL := C
 141 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 142
 143 LIBC := libc
 144 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
 145 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
 146
 147 UCLIBC_LDSO_NAME := ld-uClibc
 148 ARCH_NATIVE_BIT := 32
 149 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
 150 UCLIBC_LDSO_NAME := ld64-uClibc
 151 ARCH_NATIVE_BIT := 64
 152 else
 153 ifeq ($(CONFIG_MIPS_N64_ABI),y)
 154 UCLIBC_LDSO_NAME := ld64-uClibc
 155 ARCH_NATIVE_BIT := 64
 156 endif
 157 endif
 158
 159 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 160 NONSHARED_LIBNAME := uclibc_nonshared.a
 161 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 162 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 163 ifneq ($(ARCH_HAS_NO_SHARED),y)
 164 libdl.depend := $(top_builddir)lib/libdl.so
 165 endif
 166 ifneq ($(HAS_NO_THREADS),y)
 167 libpthread.depend := $(top_builddir)lib/libpthread.so
 168 endif
 169 interp := $(top_builddir)lib/interp.os
 170 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 171 headers_dep := $(top_builddir)include/bits/sysnum.h
 172 sub_headers := $(headers_dep)
 173
 174 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 175 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 176
 177 # Make sure DESTDIR and PREFIX can be used to install
 178 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 179 ifndef PREFIX
 180 PREFIX = $(DESTDIR)
 181 endif
 182
 183 ifneq ($(HAVE_SHARED),y)
 184 libc :=
 185 interp :=
 186 ldso :=
 187 endif
 188
 189 comma:=,
 190 space:= #
 191
 192 ifeq ($(CROSS_COMPILE),)
 193 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 194 endif
 195
 196 # A nifty macro to make testing gcc features easier
 197 check_gcc=$(shell \
 198         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 199         then echo "$(1)"; else echo "$(2)"; fi)
 200 check_as=$(shell \
 201         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 202         then echo "-Wa,$(1)"; fi)
 203 check_ld=$(shell \
 204         if $(CC) $(LDFLAG-fuse-ld) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 205         then echo "$(1)"; fi)
 206
 207 # Use variable indirection here so that we can have variable
 208 # names with fun chars in them like equal signs
 209 define check-tool-var
 210 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 211 _v = $(2)_$(3)
 212 ifndef $$(_v)
 213 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 214 export $$(_v)
 215 endif
 216 endif
 217 endef
 218
 219 # Usage: check-gcc-var,<flag>
 220 # Check the C compiler to see if it supports <flag>.
 221 # Export the variable CFLAG_<flag> if it does.
 222 define check-gcc-var
 223 $(call check-tool-var,check_gcc,CFLAG,$(1))
 224 endef
 225 # Usage: check-as-var,<flag>
 226 # Check the assembler to see if it supports <flag>.  Export the
 227 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 228 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 229 define check-as-var
 230 $(call check-tool-var,check_as,ASFLAG,$(1))
 231 _v = CFLAG_-Wa$(1)
 232 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 233 endef
 234 # Usage: check-ld-var,<flag>
 235 # Check the linker to see if it supports <flag>.  Export the
 236 # variable LDFLAG_<flag> if it does (for invoking the linker),
 237 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 238 define check-ld-var
 239 $(call check-tool-var,check_ld,LDFLAG,$(1))
 240 _v = CFLAG_-Wl$(1)
 241 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 242 endef
 243 # Usage: cache-output-var,<variable>,<shell command>
 244 # Execute <shell command> and cache the output in <variable>.
 245 define cache-output-var
 246 ifndef $(1)
 247 $(1) := $$(shell $(2))
 248 export $(1)
 249 endif
 250 endef
 251
 252
 253 ARFLAGS:=cr
 254
 255 # Note: The check for -nostdlib has to be before all calls to check_ld
 256 $(eval $(call check-gcc-var,-nostdlib))
 257 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(EXTRA_UCLIBC_FLAGS))
 258 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 259
 260 # Flags in OPTIMIZATION are used only for non-debug builds
 261
 262 OPTIMIZATION:=
 263 # Use '-Os' optimization if available, else use -O2, allow Config to override
 264 $(eval $(call check-gcc-var,-Os))
 265 ifneq ($(CFLAG_-Os),)
 266 OPTIMIZATION += $(CFLAG_-Os)
 267 else
 268 $(eval $(call check-gcc-var,-O2))
 269 OPTIMIZATION += $(CFLAG_-O2)
 270 endif
 271 # Use the gcc 3.4 -funit-at-a-time optimization when available
 272 $(eval $(call check-gcc-var,-funit-at-a-time))
 273 OPTIMIZATION += $(CFLAG_-funit-at-a-time)
 274 # shrinks code by about 0.1%
 275 $(eval $(call check-gcc-var,-fmerge-all-constants))
 276 $(eval $(call check-gcc-var,-fstrict-aliasing))
 277 OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
 278
 279 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 280 GCC_VER := $(subst ., ,$(GCC_VER))
 281 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 282 #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 283
 284 ifneq ($(TARGET_ARCH),arc)
 285 ifeq ($(GCC_MAJOR_VER),4)
 286 # shrinks code, results are from 4.0.2
 287 # 0.36%
 288 $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
 289 OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
 290 # 0.34%
 291 $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
 292 OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
 293 # 0.1%
 294 $(eval $(call check-gcc-var,-fno-strength-reduce))
 295 OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
 296 endif
 297 endif
 298
 299 # CPU_CFLAGS-y contain options which are not warnings,
 300 # not include or library paths, and not optimizations.
 301
 302 # Why -funsigned-char: I hunted a bug related to incorrect
 303 # sign extension of 'char' type for 10 hours straight. Not fun.
 304 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 305
 306 $(eval $(call check-gcc-var,-fno-asm))
 307 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 308
 309 LDADD_LIBFLOAT=
 310 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 311 # If -msoft-float isn't supported, we want an error anyway.
 312 # Hmm... might need to revisit this for arm since it has 2 different
 313 # soft float encodings.
 314 ifneq ($(TARGET_ARCH),nios)
 315 ifneq ($(TARGET_ARCH),nios2)
 316 ifneq ($(TARGET_ARCH),sh)
 317 ifneq ($(TARGET_ARCH),c6x)
 318 CPU_CFLAGS-y += -msoft-float
 319 endif
 320 endif
 321 endif
 322 endif
 323 ifeq ($(TARGET_ARCH),arm)
 324 # No longer needed with current toolchains, but leave it here for now.
 325 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
 326 #    LDADD_LIBFLOAT=-lfloat
 327 endif
 328 endif
 329
 330 $(eval $(call check-gcc-var,-std=gnu99))
 331 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 332
 333 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 334 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 335
 336 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 337 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 338
 339 PICFLAG-y := -fPIC
 340 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 341 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 342 PICFLAG := $(PICFLAG-y)
 343 PIEFLAG_NAME:=-fPIE
 344
 345 # Some nice CPU specific optimizations
 346 ifeq ($(TARGET_ARCH),i386)
 347 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 348         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 349
 350 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 351         # TODO: Change this to a gcc version check.  This bug
 352         # should be fixed with at least gcc-4.3.
 353         # Non-SSE capable processor.
 354         # NB: this may make SSE insns segfault!
 355         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 356         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 357         # -m32 is needed if host is 64-bit
 358         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 359 else
 360 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 361         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 362 endif
 363
 364         # Choice of alignment (please document why!)
 365         #  -falign-labels: in-line labels
 366         #  (reachable by normal code flow, aligning will insert nops
 367         #  which will be executed - may even make things slower)
 368         #  -falign-jumps: reachable only by a jump
 369         # Generic: no alignment at all (smallest code)
 370         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 371         OPTIMIZATION+=$(GCC_FALIGN)
 372
 373         # Putting each function and data object into its own section
 374         # allows for kbytes of less text if users link against static uclibc
 375         # using ld --gc-sections.
 376         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 377         # do not use --gc-sections at shared lib link time.
 378         # However, in combination with sections being sorted by alignment
 379         # it does result in much reduced padding:
 380         #   text    data     bss     dec     hex
 381         # 235319    1472    5992  242783   3b45f old.so
 382         # 234104    1472    5980  241556   3af94 new.so
 383         # Without -ffunction-sections, all functions will get aligned
 384         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 385         # It specifies 4 byte align for .text even if not told to do so:
 386         # Idx Name          Size      VMA       LMA       File off  Algn
 387         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 388         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 389         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 390 $(eval $(call check-ld-var,--sort-section=alignment))
 391         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 392
 393         CPU_LDFLAGS-y+=-m32
 394         CPU_CFLAGS-y+=-m32
 395 endif
 396
 397 ifeq ($(TARGET_ARCH),sparc)
 398         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 399         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 400         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 401         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 402 endif
 403
 404 ifeq ($(TARGET_ARCH),arm)
 405         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 406         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 407         CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
 408 endif
 409
 410 ifeq ($(TARGET_ARCH),metag)
 411         SYMBOL_PREFIX=_
 412         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 413         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 414 endif
 415
 416 ifeq ($(TARGET_ARCH),mips)
 417         OPTIMIZATION+=-mno-split-addresses
 418         CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
 419         CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
 420         CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
 421         CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
 422         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
 423         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
 424         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
 425         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64R2)+=-mips64r2 -mtune=mips64r2
 426         ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
 427                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
 428                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
 429         endif
 430         ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
 431                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
 432                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
 433         endif
 434         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 435         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 436         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 437 endif
 438
 439 ifeq ($(TARGET_ARCH),nios)
 440         OPTIMIZATION+=-funaligned-struct-hack
 441         CPU_LDFLAGS-y+=-Wl,-m32
 442         CPU_CFLAGS-y+=-Wl,-m32
 443 endif
 444
 445 ifeq ($(TARGET_ARCH),sh)
 446 $(eval $(call check-gcc-var,-mprefergot))
 447         OPTIMIZATION += $(CFLAG_-mprefergot)
 448         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 449         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 450         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 451         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 452 ifeq ($(UCLIBC_HAS_FPU),y)
 453         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 454         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 455 else
 456         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 457         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 458 endif
 459 endif
 460
 461 ifeq ($(TARGET_ARCH),sh64)
 462         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 463         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 464         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 465 endif
 466
 467 ifeq ($(TARGET_ARCH),h8300)
 468         SYMBOL_PREFIX=_
 469         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
 470         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-ms8300s
 471         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 472         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 473 endif
 474
 475 ifeq ($(TARGET_ARCH),i960)
 476         OPTIMIZATION+=-mh -mint32 #-fsigned-char
 477 endif
 478
 479 ifeq ($(TARGET_ARCH),e1)
 480         OPTIMIZATION+=-mgnu-param
 481 endif
 482
 483 ifeq ($(TARGET_ARCH),cris)
 484         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 485         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 486         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 487         PICFLAG:=-fpic
 488         PIEFLAG_NAME:=-fpie
 489 endif
 490
 491 ifeq ($(TARGET_ARCH),m68k)
 492         # -fPIC is only supported for 68020 and above.  It is not supported
 493         # for 68000, 68010, or Coldfire.
 494         PICFLAG:=-fpic
 495         PIEFLAG_NAME:=-fpie
 496 endif
 497
 498 ifeq ($(TARGET_ARCH),powerpc)
 499 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 500 # enough. Therefore use -fpic which will reduce code size and generates
 501 # faster code.
 502         PICFLAG:=-fpic
 503         PIEFLAG_NAME:=-fpie
 504         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 505         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 506         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 507
 508 endif
 509
 510 ifeq ($(TARGET_ARCH),bfin)
 511         SYMBOL_PREFIX=_
 512 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 513         CPU_CFLAGS-y:=-mfdpic
 514         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 515         PICFLAG:=-fpic
 516         PIEFLAG_NAME:=-fpie
 517 endif
 518 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 519         PICFLAG := -mleaf-id-shared-library
 520 endif
 521 endif
 522
 523 ifeq ($(TARGET_ARCH),frv)
 524         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 525         # Using -pie causes the program to have an interpreter, which is
 526         # forbidden, so we must make do with -shared.  Unfortunately,
 527         # -shared by itself would get us global function descriptors
 528         # and calls through PLTs, dynamic resolution of symbols, etc,
 529         # which would break as well, but -Bsymbolic comes to the rescue.
 530         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 531         UCLIBC_LDSO=ld.so.1
 532 endif
 533
 534 ifeq ($(strip $(TARGET_ARCH)),avr32)
 535        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 536        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 537        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 538 endif
 539
 540 ifeq ($(TARGET_ARCH),i960)
 541       SYMBOL_PREFIX=_
 542 endif
 543
 544 ifeq ($(TARGET_ARCH),v850)
 545       SYMBOL_PREFIX=_
 546 endif
 547
 548 ifeq ($(TARGET_ARCH),c6x)
 549         PIEFLAG:=
 550         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 551         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 552         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 553         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 554         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 555 endif
 556
 557 ifeq ($(TARGET_ARCH),arc)
 558         CPU_CFLAGS-y += -mlock -mswape
 559         CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
 560         CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
 561 endif
 562
 563 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 564 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 565 ifeq ($(PIEFLAG),)
 566 PIEFLAG := $(PICFLAG)
 567 endif
 568 # We need to keep track of both the CC PIE flag (above) as
 569 # well as the LD PIE flag (below) because we can't rely on
 570 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 571 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 572 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 573
 574 # Check for --as-needed support in linker
 575 ifndef LD_FLAG_ASNEEDED
 576 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 577 ifneq ($(_LD_FLAG_ASNEEDED),)
 578 export LD_FLAG_ASNEEDED:=--as-needed
 579 endif
 580 endif
 581 ifndef LD_FLAG_NO_ASNEEDED
 582 ifdef LD_FLAG_ASNEEDED
 583 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 584 endif
 585 endif
 586 ifndef CC_FLAG_ASNEEDED
 587 ifdef LD_FLAG_ASNEEDED
 588 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 589 endif
 590 endif
 591 ifndef CC_FLAG_NO_ASNEEDED
 592 ifdef LD_FLAG_NO_ASNEEDED
 593 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 594 endif
 595 endif
 596 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 597
 598 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 599 ifndef ASNEEDED
 600 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 601
 602 # Only used in installed libc.so linker script
 603 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 604 ifeq ($(HARDWIRED_ABSPATH),y)
 605 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 606 else
 607 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 608 endif
 609 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
 610         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 611         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 612 else
 613 export UBACKTRACE_ASNEEDED:=""
 614 endif
 615 endif
 616
 617 # Add a bunch of extra pedantic annoyingly strict checks
 618 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 619 ifeq ($(EXTRA_WARNINGS),y)
 620 WARNING_FLAGS += \
 621         -Wformat=2 \
 622         -Wmissing-noreturn \
 623         -Wmissing-format-attribute \
 624         -Wmissing-prototypes \
 625         -Wmissing-declarations \
 626         -Wnested-externs \
 627         -Wnonnull \
 628         -Wold-style-declaration \
 629         -Wold-style-definition \
 630         -Wshadow \
 631         -Wundef
 632 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 633 WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 634 endif
 635 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 636 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 637 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 638
 639 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 640
 641 # Save the tested flag in a single variable and force it to be
 642 # evaluated just once.  Then use that computed value.
 643 $(eval $(call check-gcc-var,-fno-stack-protector))
 644 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 645 ifeq ($(UCLIBC_BUILD_SSP),y)
 646 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 647 $(eval $(call check-gcc-var,-fstack-protector))
 648 $(eval $(call check-gcc-var,-fstack-protector-all))
 649 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 650 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 651 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 652 else
 653 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 654 endif
 655
 656 # Collect all CFLAGS components
 657 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 658         -nostdinc -I$(top_builddir)include \
 659         -I$(top_srcdir)include -include libc-symbols.h \
 660         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 661         -I$(top_srcdir)libc/sysdeps/linux \
 662         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 663         -I$(top_srcdir)ldso/include -I.
 664 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 665 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 666 endif
 667
 668 # We need this to be checked within libc-symbols.h
 669 ifneq ($(HAVE_SHARED),y)
 670 CFLAGS += -DSTATIC
 671 endif
 672
 673 $(eval $(call check-ld-var,--warn-once))
 674 $(eval $(call check-ld-var,--sort-common))
 675 $(eval $(call check-ld-var,--discard-all))
 676 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 677         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 678 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 679 #$(eval $(call check-ld-var,--gc-sections))
 680 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 681
 682 $(eval $(call check-gcc-var,-fdata-sections))
 683 $(eval $(call check-gcc-var,-ffunction-sections))
 684
 685 ifeq ($(UCLIBC_BUILD_RELRO),y)
 686 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 687 endif
 688
 689 ifeq ($(UCLIBC_BUILD_NOW),y)
 690 LDFLAGS_NOSTRIP+=-Wl,-z,now
 691 endif
 692
 693 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 694 # Be sure that binutils support it
 695 $(eval $(call check-ld-var,--hash-style=gnu))
 696 ifeq ($(LDFLAG_--hash-style=gnu),)
 697 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 698 $(error Your binutils do not support --hash-style option, while you want to use it)
 699 endif
 700 else
 701 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 702 endif
 703 endif
 704
 705 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 706 ifeq ($(DODEBUG),y)
 707 CFLAGS += -O0 -g3 -DDEBUG
 708 else
 709 CFLAGS += $(OPTIMIZATION)
 710 endif
 711 ifeq ($(DOSTRIP),y)
 712 LDFLAGS += -Wl,-s
 713 else
 714 STRIPTOOL := true -Stripping_disabled
 715 endif
 716 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 717 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 718 endif
 719
 720 ifeq ($(DOMULTI),y)
 721 # we try to compile all sources at once into an object (IMA), but
 722 # gcc-3.3.x does not support it
 723 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 724 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 725 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 726 ifeq ($(GCC_MAJOR_VER),3)
 727 DOMULTI:=n
 728 else
 729 $(eval $(call check-gcc-var,--combine))
 730 CFLAGS += $(CFLAG_--combine)
 731 endif
 732 else
 733 DOMULTI:=n
 734 endif
 735
 736 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 737 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 738 endif
 739
 740 ifeq ($(UCLIBC_HAS_THREADS),y)
 741 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 742         PTNAME := nptl
 743         CFLAGS += -DHAVE_FORCED_UNWIND
 744 else
 745 ifeq ($(LINUXTHREADS_OLD),y)
 746         PTNAME := linuxthreads.old
 747 else
 748         PTNAME := linuxthreads
 749 endif
 750 endif
 751 PTDIR := libpthread/$(PTNAME)
 752 # set up system dependencies include dirs (NOTE: order matters!)
 753 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 754 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 755         -I$(top_srcdir)$(PTDIR)                                         \
 756         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 757         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 758         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 759         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 760         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 761         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 762         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 763         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 764         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 765 #
 766 # Test for TLS if NPTL support was selected.
 767 #
 768 GCC_HAS_TLS=$(shell \
 769         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 770 ifneq ($(GCC_HAS_TLS),)
 771 gcc_tls_test_fail:
 772         @echo "####";
 773         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 774         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 775         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 776         @echo "#### about this problem.";
 777         @echo "####";
 778         @echo "#### Exiting...";
 779         @echo "####";
 780         @exit 1;
 781 endif
 782 else
 783 PTINC := \
 784         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 785         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 786         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 787         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 788         -I$(top_srcdir)$(PTDIR) \
 789         -I$(top_srcdir)libpthread
 790 endif
 791 CFLAGS+=$(PTINC)
 792 else
 793         PTNAME :=
 794         PTINC  :=
 795 endif
 796 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 797
 798 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 799 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 800 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 801 CFLAGS += $(CC_INC)
 802
 803 CFLAGS += -I$(KERNEL_HEADERS)
 804
 805 ifneq ($(DOASSERTS),y)
 806 CFLAGS+=-DNDEBUG
 807 endif
 808
 809 ifeq ($(SYMBOL_PREFIX),_)
 810 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 811 endif
 812
 813 # Keep the check_as from being needlessly executed
 814 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 815 $(eval $(call check-as-var,--noexecstack))
 816 endif
 817 ASFLAGS = $(ASFLAG_--noexecstack)
 818
 819 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 820 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 821 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 822 # with -O0 we (e.g. lockf) might end up with references to
 823 # _Unwind_Resume, so pull in gcc_eh in this case..
 824 LIBGCC_DIR:=$(dir $(LIBGCC))
 825 LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
 826
 827 # moved from libpthread/linuxthreads
 828 ifeq ($(UCLIBC_CTOR_DTOR),y)
 829 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 830 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 831 endif
 832
 833 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 834
 835 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"