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
  31 #-----------------------------------------------------------
  32 # If you are running a cross compiler, you will want to set
  33 # 'CROSS_COMPILE' to something more interesting ...  Target
  34 # architecture is determined by asking the CC compiler what
  35 # arch it compiles things for, so unless your compiler is
  36 # broken, you should not need to specify TARGET_ARCH.
  37 #
  38 # Most people will set this stuff on the command line, i.e.
  39 #        make CROSS_COMPILE=arm-linux-
  40 # will build uClibc for 'arm'.
  41 # CROSS is still supported for backward compatibily only
  42
  43 CROSS_COMPILE ?= $(CROSS)
  44
  45 CC         = $(CROSS_COMPILE)gcc
  46 AR         = $(CROSS_COMPILE)ar
  47 LD         = $(CROSS_COMPILE)ld
  48 NM         = $(CROSS_COMPILE)nm
  49 OBJDUMP    = $(CROSS_COMPILE)objdump
  50 STRIPTOOL  = $(CROSS_COMPILE)strip
  51
  52 INSTALL    = install
  53 LN         = ln
  54 RM         = rm -f
  55 TAR        = tar
  56 SED        = sed
  57 AWK        = awk
  58
  59 STRIP_FLAGS ?= -x -R .note -R .comment
  60
  61 ## unused? if yes, remove after 0.9.31
  62 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  63
  64 # Select the compiler needed to build binaries for your development system
  65 HOSTCC     = gcc
  66 BUILD_CFLAGS = -Os -Wall
  67
  68 #---------------------------------------------------------
  69 # Nothing beyond this point should ever be touched by mere
  70 # mortals.  Unless you hang out with the gods, you should
  71 # probably leave all this stuff alone.
  72
  73 # strip quotes
  74 qstrip = $(strip $(subst ",,$(1)))
  75 #"))
  76
  77 ifndef KCONFIG_CONFIG
  78 KCONFIG_CONFIG := $(top_builddir).config
  79 endif
  80 export KCONFIG_CONFIG
  81
  82 # Pull in the user's uClibc configuration
  83 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  84 # Prevent make from searching
  85 __ABS_KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  86 -include $(__ABS_KCONFIG_CONFIG)
  87 endif
  88 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  89 ifeq ($(TARGET_ARCH),)
  90 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  91                                   -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  92                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
  93                                   -e s/sh.*/sh/ \
  94                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  95                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  96                                   -e s/xtensa.*/xtensa/ )
  97 else
  98 ARCH = $(TARGET_ARCH)
  99 endif
 100 export ARCH
 101
 102 # Make certain these contain a final "/", but no "//"s.
 103 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
 104 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
 105 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
 106 DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
 107 MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
 108 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
 109 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
 110
 111
 112 # Now config hard core
 113 MAJOR_VERSION := 0
 114 MINOR_VERSION := 9
 115 SUBLEVEL      := 34
 116 EXTRAVERSION  :=-git
 117 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 118 ABI_VERSION   := $(MAJOR_VERSION)
 119 ifneq ($(EXTRAVERSION),)
 120 VERSION       := $(VERSION)$(EXTRAVERSION)
 121 endif
 122 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 123 LC_ALL := C
 124 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 125
 126 LIBC := libc
 127 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
 128 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
 129 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
 130 UCLIBC_LDSO_NAME := ld64-uClibc
 131 ARCH_NATIVE_BIT := 64
 132 else
 133 UCLIBC_LDSO_NAME := ld-uClibc
 134 ARCH_NATIVE_BIT := 32
 135 endif
 136 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 137 NONSHARED_LIBNAME := uclibc_nonshared.a
 138 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 139 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 140 ifneq ($(ARCH_HAS_NO_SHARED),y)
 141 libdl.depend := $(top_builddir)lib/libdl.so
 142 endif
 143 ifneq ($(HAS_NO_THREADS),y)
 144 libpthread.depend := $(top_builddir)lib/libpthread.so
 145 endif
 146 interp := $(top_builddir)lib/interp.os
 147 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 148 headers_dep := $(top_builddir)include/bits/sysnum.h
 149 sub_headers := $(headers_dep)
 150
 151 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 152 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 153
 154 # Make sure DESTDIR and PREFIX can be used to install
 155 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 156 ifndef PREFIX
 157 PREFIX = $(DESTDIR)
 158 endif
 159
 160 ifneq ($(HAVE_SHARED),y)
 161 libc :=
 162 interp :=
 163 ldso :=
 164 endif
 165
 166 comma:=,
 167 space:= #
 168
 169 ifeq ($(CROSS_COMPILE),)
 170 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 171 endif
 172
 173 # A nifty macro to make testing gcc features easier
 174 check_gcc=$(shell \
 175         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 176         then echo "$(1)"; else echo "$(2)"; fi)
 177 check_as=$(shell \
 178         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 179         then echo "-Wa,$(1)"; fi)
 180 check_ld=$(shell \
 181         if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
 182         then echo "$(1)"; fi)
 183
 184 # Use variable indirection here so that we can have variable
 185 # names with fun chars in them like equal signs
 186 define check-tool-var
 187 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 188 _v = $(2)_$(3)
 189 ifndef $$(_v)
 190 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 191 export $$(_v)
 192 endif
 193 endif
 194 endef
 195
 196 # Usage: check-gcc-var,<flag>
 197 # Check the C compiler to see if it supports <flag>.
 198 # Export the variable CFLAG_<flag> if it does.
 199 define check-gcc-var
 200 $(call check-tool-var,check_gcc,CFLAG,$(1))
 201 endef
 202 # Usage: check-as-var,<flag>
 203 # Check the assembler to see if it supports <flag>.  Export the
 204 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 205 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 206 define check-as-var
 207 $(call check-tool-var,check_as,ASFLAG,$(1))
 208 _v = CFLAG_-Wa$(1)
 209 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 210 endef
 211 # Usage: check-ld-var,<flag>
 212 # Check the linker to see if it supports <flag>.  Export the
 213 # variable LDFLAG_<flag> if it does (for invoking the linker),
 214 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 215 define check-ld-var
 216 $(call check-tool-var,check_ld,LDFLAG,$(1))
 217 _v = CFLAG_-Wl$(1)
 218 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 219 endef
 220 # Usage: cache-output-var,<variable>,<shell command>
 221 # Execute <shell command> and cache the output in <variable>.
 222 define cache-output-var
 223 ifndef $(1)
 224 $(1) := $$(shell $(2))
 225 export $(1)
 226 endif
 227 endef
 228
 229
 230 ARFLAGS:=cr
 231
 232
 233 # Flags in OPTIMIZATION are used only for non-debug builds
 234
 235 OPTIMIZATION:=
 236 # Use '-Os' optimization if available, else use -O2, allow Config to override
 237 $(eval $(call check-gcc-var,-Os))
 238 ifneq ($(CFLAG_-Os),)
 239 OPTIMIZATION += $(CFLAG_-Os)
 240 else
 241 $(eval $(call check-gcc-var,-O2))
 242 OPTIMIZATION += $(CFLAG_-O2)
 243 endif
 244 # Use the gcc 3.4 -funit-at-a-time optimization when available
 245 $(eval $(call check-gcc-var,-funit-at-a-time))
 246 OPTIMIZATION += $(CFLAG_-funit-at-a-time)
 247 # shrinks code by about 0.1%
 248 $(eval $(call check-gcc-var,-fmerge-all-constants))
 249 $(eval $(call check-gcc-var,-fstrict-aliasing))
 250 OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
 251
 252 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 253 GCC_VER := $(subst ., ,$(GCC_VER))
 254 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 255 #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 256
 257 ifeq ($(GCC_MAJOR_VER),4)
 258 # shrinks code, results are from 4.0.2
 259 # 0.36%
 260 $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
 261 OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
 262 # 0.34%
 263 $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
 264 OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
 265 # 0.1%
 266 $(eval $(call check-gcc-var,-fno-strength-reduce))
 267 OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
 268 endif
 269
 270
 271 # CPU_CFLAGS-y contain options which are not warnings,
 272 # not include or library paths, and not optimizations.
 273
 274 # Why -funsigned-char: I hunted a bug related to incorrect
 275 # sign extension of 'char' type for 10 hours straight. Not fun.
 276 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 277
 278 $(eval $(call check-gcc-var,-fno-asm))
 279 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 280
 281 LDADD_LIBFLOAT=
 282 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 283 # If -msoft-float isn't supported, we want an error anyway.
 284 # Hmm... might need to revisit this for arm since it has 2 different
 285 # soft float encodings.
 286 ifneq ($(TARGET_ARCH),nios)
 287 ifneq ($(TARGET_ARCH),nios2)
 288 ifneq ($(TARGET_ARCH),sh)
 289 ifneq ($(TARGET_ARCH),c6x)
 290 CPU_CFLAGS-y += -msoft-float
 291 endif
 292 endif
 293 endif
 294 endif
 295 ifeq ($(TARGET_ARCH),arm)
 296 # No longer needed with current toolchains, but leave it here for now.
 297 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
 298 #    LDADD_LIBFLOAT=-lfloat
 299 endif
 300 endif
 301
 302 $(eval $(call check-gcc-var,-std=gnu99))
 303 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 304
 305 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 306 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 307
 308 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 309 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 310
 311 PICFLAG-y := -fPIC
 312 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 313 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 314 PICFLAG := $(PICFLAG-y)
 315 PIEFLAG_NAME:=-fPIE
 316
 317 # Some nice CPU specific optimizations
 318 ifeq ($(TARGET_ARCH),i386)
 319 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 320         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 321
 322 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
 323         # Non-SSE capable processor.
 324         # NB: this may make SSE insns segfault!
 325         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 326         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 327         # -m32 is needed if host is 64-bit
 328         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 329 else
 330 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 331         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 332 endif
 333
 334         # Choice of alignment (please document why!)
 335         #  -falign-labels: in-line labels
 336         #  (reachable by normal code flow, aligning will insert nops
 337         #  which will be executed - may even make things slower)
 338         #  -falign-jumps: reachable only by a jump
 339         # Generic: no alignment at all (smallest code)
 340         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 341 ifeq ($(CONFIG_K7),y)
 342         # Align functions to four bytes, use default for jumps and loops (why?)
 343         GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
 344 endif
 345 ifeq ($(CONFIG_CRUSOE),y)
 346         # Use compiler's default for functions, jumps and loops (why?)
 347         GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
 348 endif
 349 ifeq ($(CONFIG_CYRIXIII),y)
 350         # Use compiler's default for functions, jumps and loops (why?)
 351         GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
 352 endif
 353         OPTIMIZATION+=$(GCC_FALIGN)
 354
 355         # Putting each function and data object into its own section
 356         # allows for kbytes of less text if users link against static uclibc
 357         # using ld --gc-sections.
 358         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 359         # do not use --gc-sections at shared lib link time.
 360         # However, in combination with sections being sorted by alignment
 361         # it does result in much reduced padding:
 362         #   text    data     bss     dec     hex
 363         # 235319    1472    5992  242783   3b45f old.so
 364         # 234104    1472    5980  241556   3af94 new.so
 365         # Without -ffunction-sections, all functions will get aligned
 366         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 367         # It specifies 4 byte align for .text even if not told to do so:
 368         # Idx Name          Size      VMA       LMA       File off  Algn
 369         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 370         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 371         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 372 $(eval $(call check-ld-var,--sort-section=alignment))
 373         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 374
 375         CPU_LDFLAGS-y+=-m32
 376         CPU_CFLAGS-y+=-m32
 377         CPU_CFLAGS-$(CONFIG_386)+=-march=i386
 378         CPU_CFLAGS-$(CONFIG_486)+=-march=i486
 379         CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
 380         CPU_CFLAGS-$(CONFIG_586)+=-march=i586
 381         CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
 382         CPU_CFLAGS-$(CONFIG_686)+=-march=i686
 383         CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
 384         CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
 385         CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
 386         CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
 387         CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
 388         CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
 389         CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
 390         CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
 391         CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
 392         CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
 393 endif
 394
 395 ifeq ($(TARGET_ARCH),sparc)
 396         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 397         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 398         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 399         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 400 endif
 401
 402 ifeq ($(TARGET_ARCH),arm)
 403         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 404         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 405         CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
 406 endif
 407
 408 ifeq ($(TARGET_ARCH),mips)
 409         OPTIMIZATION+=-mno-split-addresses
 410         CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
 411         CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
 412         CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
 413         CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
 414         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
 415         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
 416         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
 417         ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
 418                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
 419                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
 420         endif
 421         ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
 422                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
 423                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
 424         endif
 425         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 426         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 427         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 428 endif
 429
 430 ifeq ($(TARGET_ARCH),nios)
 431         OPTIMIZATION+=-funaligned-struct-hack
 432         CPU_LDFLAGS-y+=-Wl,-m32
 433         CPU_CFLAGS-y+=-Wl,-m32
 434 endif
 435
 436 ifeq ($(TARGET_ARCH),sh)
 437 $(eval $(call check-gcc-var,-mprefergot))
 438         OPTIMIZATION += $(CFLAG_-mprefergot)
 439         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 440         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 441         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 442         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 443 ifeq ($(UCLIBC_HAS_FPU),y)
 444         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 445         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 446 else
 447         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 448         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 449 endif
 450 endif
 451
 452 ifeq ($(TARGET_ARCH),sh64)
 453         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 454         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 455         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 456 endif
 457
 458 ifeq ($(TARGET_ARCH),h8300)
 459         SYMBOL_PREFIX=_
 460         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
 461         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-ms8300s
 462         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 463         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 464 endif
 465
 466 ifeq ($(TARGET_ARCH),i960)
 467         OPTIMIZATION+=-mh -mint32 #-fsigned-char
 468 endif
 469
 470 ifeq ($(TARGET_ARCH),e1)
 471         OPTIMIZATION+=-mgnu-param
 472 endif
 473
 474 ifeq ($(TARGET_ARCH),cris)
 475         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 476         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 477         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 478         PICFLAG:=-fpic
 479         PIEFLAG_NAME:=-fpie
 480 endif
 481
 482 ifeq ($(TARGET_ARCH),m68k)
 483         # -fPIC is only supported for 68020 and above.  It is not supported
 484         # for 68000, 68010, or Coldfire.
 485         PICFLAG:=-fpic
 486         PIEFLAG_NAME:=-fpie
 487 endif
 488
 489 ifeq ($(TARGET_ARCH),powerpc)
 490 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 491 # enough. Therefore use -fpic which will reduce code size and generates
 492 # faster code.
 493         PICFLAG:=-fpic
 494         PIEFLAG_NAME:=-fpie
 495         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 496         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 497         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 498
 499 endif
 500
 501 ifeq ($(TARGET_ARCH),bfin)
 502         SYMBOL_PREFIX=_
 503 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 504         CPU_CFLAGS-y:=-mfdpic
 505         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 506         PICFLAG:=-fpic
 507         PIEFLAG_NAME:=-fpie
 508 endif
 509 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 510         PICFLAG := -mleaf-id-shared-library
 511 endif
 512 endif
 513
 514 ifeq ($(TARGET_ARCH),frv)
 515         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 516         # Using -pie causes the program to have an interpreter, which is
 517         # forbidden, so we must make do with -shared.  Unfortunately,
 518         # -shared by itself would get us global function descriptors
 519         # and calls through PLTs, dynamic resolution of symbols, etc,
 520         # which would break as well, but -Bsymbolic comes to the rescue.
 521         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 522         UCLIBC_LDSO=ld.so.1
 523 endif
 524
 525 ifeq ($(strip $(TARGET_ARCH)),avr32)
 526        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 527        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 528        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 529 endif
 530
 531 ifeq ($(TARGET_ARCH),i960)
 532       SYMBOL_PREFIX=_
 533 endif
 534
 535 ifeq ($(TARGET_ARCH),v850)
 536       SYMBOL_PREFIX=_
 537 endif
 538
 539 ifeq ($(TARGET_ARCH),c6x)
 540         PIEFLAG:=
 541         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 542         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 543         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 544         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 545         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 546 endif
 547
 548 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 549 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 550 ifeq ($(PIEFLAG),)
 551 PIEFLAG := $(PICFLAG)
 552 endif
 553 # We need to keep track of both the CC PIE flag (above) as
 554 # well as the LD PIE flag (below) because we can't rely on
 555 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 556 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 557 $(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 558
 559 # Check for --as-needed support in linker
 560 ifndef LD_FLAG_ASNEEDED
 561 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
 562 ifneq ($(_LD_FLAG_ASNEEDED),)
 563 export LD_FLAG_ASNEEDED:=--as-needed
 564 endif
 565 endif
 566 ifndef LD_FLAG_NO_ASNEEDED
 567 ifdef LD_FLAG_ASNEEDED
 568 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 569 endif
 570 endif
 571 ifndef CC_FLAG_ASNEEDED
 572 ifdef LD_FLAG_ASNEEDED
 573 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 574 endif
 575 endif
 576 ifndef CC_FLAG_NO_ASNEEDED
 577 ifdef LD_FLAG_NO_ASNEEDED
 578 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 579 endif
 580 endif
 581 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 582
 583 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 584 ifndef ASNEEDED
 585 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 586
 587 # Only used in installed libc.so linker script
 588 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
 589 ifeq ($(HARDWIRED_ABSPATH),y)
 590 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
 591 else
 592 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
 593 endif
 594 export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && \
 595         echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
 596         echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
 597 else
 598 export UBACKTRACE_ASNEEDED:=""
 599 endif
 600 endif
 601
 602 # Add a bunch of extra pedantic annoyingly strict checks
 603 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 604 ifeq ($(EXTRA_WARNINGS),y)
 605 WARNING_FLAGS += \
 606         -Wformat=2 \
 607         -Wmissing-noreturn \
 608         -Wmissing-format-attribute \
 609         -Wmissing-prototypes \
 610         -Wmissing-declarations \
 611         -Wnested-externs \
 612         -Wnonnull \
 613         -Wold-style-declaration \
 614         -Wold-style-definition \
 615         -Wshadow \
 616         -Wundef
 617 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 618 WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
 619 endif
 620 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 621 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 622 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 623
 624 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 625
 626 # Save the tested flag in a single variable and force it to be
 627 # evaluated just once.  Then use that computed value.
 628 $(eval $(call check-gcc-var,-fno-stack-protector))
 629 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 630 ifeq ($(UCLIBC_BUILD_SSP),y)
 631 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 632 $(eval $(call check-gcc-var,-fstack-protector))
 633 $(eval $(call check-gcc-var,-fstack-protector-all))
 634 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 635 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 636 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 637 else
 638 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 639 endif
 640
 641 $(eval $(call check-gcc-var,-nostdlib))
 642
 643 # Collect all CFLAGS components
 644 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 645         -nostdinc -I$(top_builddir)include \
 646         -I$(top_srcdir)include -include libc-symbols.h \
 647         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 648         -I$(top_srcdir)libc/sysdeps/linux \
 649         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 650         -I$(top_srcdir)ldso/include -I.
 651 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 652 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 653 endif
 654
 655 # We need this to be checked within libc-symbols.h
 656 ifneq ($(HAVE_SHARED),y)
 657 CFLAGS += -DSTATIC
 658 endif
 659
 660 $(eval $(call check-ld-var,--warn-once))
 661 $(eval $(call check-ld-var,--sort-common))
 662 $(eval $(call check-ld-var,--discard-all))
 663 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
 664         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 665 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 666 #$(eval $(call check-ld-var,--gc-sections))
 667 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
 668
 669 $(eval $(call check-gcc-var,-fdata-sections))
 670 $(eval $(call check-gcc-var,-ffunction-sections))
 671
 672 ifeq ($(UCLIBC_BUILD_RELRO),y)
 673 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 674 endif
 675
 676 ifeq ($(UCLIBC_BUILD_NOW),y)
 677 LDFLAGS_NOSTRIP+=-Wl,-z,now
 678 endif
 679
 680 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 681 # Be sure that binutils support it
 682 $(eval $(call check-ld-var,--hash-style=gnu))
 683 ifeq ($(LDFLAG_--hash-style=gnu),)
 684 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 685 $(error Your binutils do not support --hash-style option, while you want to use it)
 686 endif
 687 else
 688 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 689 endif
 690 endif
 691
 692 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 693 ifeq ($(DODEBUG),y)
 694 CFLAGS += -O0 -g3 -DDEBUG
 695 else
 696 CFLAGS += $(OPTIMIZATION)
 697 endif
 698 ifeq ($(DOSTRIP),y)
 699 LDFLAGS += -Wl,-s
 700 else
 701 STRIPTOOL := true -Stripping_disabled
 702 endif
 703 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 704 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 705 endif
 706
 707 ifeq ($(DOMULTI),y)
 708 # we try to compile all sources at once into an object (IMA), but
 709 # gcc-3.3.x does not support it
 710 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 711 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 712 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 713 ifeq ($(GCC_MAJOR_VER),3)
 714 DOMULTI:=n
 715 else
 716 $(eval $(call check-gcc-var,--combine))
 717 CFLAGS += $(CFLAG_--combine)
 718 endif
 719 else
 720 DOMULTI:=n
 721 endif
 722
 723 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 724 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 725 endif
 726
 727 ifeq ($(UCLIBC_HAS_THREADS),y)
 728 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 729         PTNAME := nptl
 730         CFLAGS += -DHAVE_FORCED_UNWIND
 731 else
 732 ifeq ($(LINUXTHREADS_OLD),y)
 733         PTNAME := linuxthreads.old
 734 else
 735         PTNAME := linuxthreads
 736 endif
 737 endif
 738 PTDIR := libpthread/$(PTNAME)
 739 # set up system dependencies include dirs (NOTE: order matters!)
 740 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 741 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 742         -I$(top_srcdir)$(PTDIR)                                         \
 743         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 744         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 745         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 746         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 747         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 748         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 749         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 750         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 751         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 752 #
 753 # Test for TLS if NPTL support was selected.
 754 #
 755 GCC_HAS_TLS=$(shell \
 756         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 757 ifneq ($(GCC_HAS_TLS),)
 758 gcc_tls_test_fail:
 759         @echo "####";
 760         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 761         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 762         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 763         @echo "#### about this problem.";
 764         @echo "####";
 765         @echo "#### Exiting...";
 766         @echo "####";
 767         @exit 1;
 768 endif
 769 else
 770 PTINC := \
 771         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 772         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 773         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 774         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 775         -I$(top_srcdir)$(PTDIR) \
 776         -I$(top_srcdir)libpthread
 777 endif
 778 CFLAGS+=$(PTINC)
 779 else
 780         PTNAME :=
 781         PTINC  :=
 782 endif
 783 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 784
 785 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 786 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 787 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 788 CFLAGS += $(CC_INC)
 789
 790 CFLAGS += -I$(KERNEL_HEADERS)
 791
 792 ifneq ($(DOASSERTS),y)
 793 CFLAGS+=-DNDEBUG
 794 endif
 795
 796 ifeq ($(SYMBOL_PREFIX),_)
 797 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 798 endif
 799
 800 # Keep the check_as from being needlessly executed
 801 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 802 $(eval $(call check-as-var,--noexecstack))
 803 endif
 804 ASFLAGS = $(ASFLAG_--noexecstack)
 805
 806 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 807 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 808 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 809 # with -O0 we (e.g. lockf) might end up with references to
 810 # _Unwind_Resume, so pull in gcc_eh in this case..
 811 LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
 812 LIBGCC_DIR:=$(dir $(LIBGCC))
 813
 814 # moved from libpthread/linuxthreads
 815 ifeq ($(UCLIBC_CTOR_DTOR),y)
 816 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 817 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 818 endif
 819
 820 LOCAL_INSTALL_PATH := install_dir
 821
 822 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"