Rules.mak

   1 # Rules.mak for uClibc-ng
   2 #
   3 # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
   4 # Copyright (C) 2015-2017 Waldemar Brodkorb <wbx@uclibc-ng.org>
   5 #
   6 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   7 #
   8
   9 # make nano-doc
  10 # FOO = bar  -- recursively expanded variable. Value is remebered verbatim.
  11 #               If it contains references to other variables, these references
  12 #               are expanded whenever this variable is _substituted_.
  13 # FOO := bar -- simply expanded variable. Right hand is expanded when
  14 #               the variable is _defined_. Therefore faster than =.
  15 # FOO ?= bar -- set a value only if it is not already set
  16 #               (behaves as =, not :=).
  17 # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  18
  19
  20 # check for proper make version
  21 ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  22 $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  23 endif
  24
  25 #-----------------------------------------------------------
  26 # This file contains rules which are shared between multiple
  27 # Makefiles.  All normal configuration options live in the
  28 # file named ".config".  Don't mess with this file unless
  29 # you know what you are doing.
  30
  31 clean_targets := clean realclean distclean \
  32         objclean-y headers_clean-y CLEAN_utils
  33 noconfig_targets := menuconfig config nconfig \
  34         oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
  35         alldefconfig randconfig defconfig savedefconfig listnewconfig \
  36         olddefconfig \
  37         xconfig gconfig update-po-config mconf qconf gconf nconf conf \
  38         release dist tags help
  39
  40
  41 #-----------------------------------------------------------
  42 # If you are running a cross compiler, you will want to set
  43 # 'CROSS_COMPILE' to something more interesting ...  Target
  44 # architecture is determined by asking the CC compiler what
  45 # arch it compiles things for, so unless your compiler is
  46 # broken, you should not need to specify TARGET_ARCH.
  47 #
  48 # Most people will set this stuff on the command line, i.e.
  49 #        make CROSS_COMPILE=arm-linux-
  50 # will build uClibc-ng for 'arm'.
  51 # CROSS is still supported for backward compatibily only
  52
  53 CROSS_COMPILE ?= $(CROSS)
  54
  55 CC         = $(CROSS_COMPILE)gcc
  56 AR         = $(CROSS_COMPILE)ar
  57 LD         = $(CROSS_COMPILE)ld
  58 NM         = $(CROSS_COMPILE)nm
  59 OBJDUMP    = $(CROSS_COMPILE)objdump
  60 STRIPTOOL  = $(CROSS_COMPILE)strip
  61
  62 INSTALL    = install
  63 LN         = ln
  64 RM         = rm -f
  65 TAR        = tar
  66 SED        = sed
  67 AWK        = awk
  68
  69 STRIP_FLAGS ?= -x -R .note -R .comment
  70
  71 # Select the compiler needed to build binaries for your development system
  72 HOSTCC     = gcc
  73 BUILD_CFLAGS = -Os
  74
  75 #---------------------------------------------------------
  76 # Nothing beyond this point should ever be touched by mere
  77 # mortals.  Unless you hang out with the gods, you should
  78 # probably leave all this stuff alone.
  79
  80 # strip quotes
  81 qstrip = $(strip $(subst ",,$(1)))
  82 #"))
  83
  84 # kconfig stuff
  85 KCONFIG_CONFIG ?= $(top_builddir).config
  86 KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  87 export KCONFIG_CONFIG
  88 KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  89 export KCONFIG_AUTOCONFIG
  90 KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  91 export KCONFIG_TRISTATE
  92 srctree := $(abspath $(top_srcdir))
  93 export srctree
  94 KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  95 export KCONFIG_AUTOHEADER
  96 Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  97
  98 # Pull in the user's uClibc-ng configuration
  99 ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
 100 -include $(KCONFIG_CONFIG)
 101 endif
 102
 103 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
 104 ifeq ($(TARGET_ARCH),)
 105 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
 106                                   -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
 107                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 108                                   -e s/nds32.*/nds32/ \
 109                                   -e s/sh.*/sh/ \
 110                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
 111                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 112                                   -e s/xtensa.*/xtensa/ )
 113 else
 114 ARCH = $(TARGET_ARCH)
 115 endif
 116 export ARCH
 117
 118 # Make certain these contain a final "/", but no "//"s.
 119 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
 120 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
 121 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
 122 DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
 123 MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
 124 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
 125 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
 126
 127
 128 # Now config hard core
 129 MAJOR_VERSION := 1
 130 MINOR_VERSION := 0
 131 SUBLEVEL      := 24
 132 EXTRAVERSION  :=
 133 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 134 ABI_VERSION   := $(MAJOR_VERSION)
 135 ifneq ($(EXTRAVERSION),)
 136 VERSION       := $(VERSION)$(EXTRAVERSION)
 137 endif
 138 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 139 LC_ALL := C
 140 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 141
 142 LIBC := libc
 143 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
 144
 145 UCLIBC_LDSO_NAME := ld-uClibc
 146 ARCH_NATIVE_BIT := 32
 147 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
 148 UCLIBC_LDSO_NAME := ld64-uClibc
 149 ARCH_NATIVE_BIT := 64
 150 else
 151 ifeq ($(CONFIG_MIPS_N64_ABI),y)
 152 UCLIBC_LDSO_NAME := ld64-uClibc
 153 ARCH_NATIVE_BIT := 64
 154 endif
 155 endif
 156
 157 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 158 NONSHARED_LIBNAME := uclibc_nonshared.a
 159 NONSHARED_LIBPTHREAD := libpthread_nonshared.a
 160
 161 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 162 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 163 interp := $(top_builddir)lib/interp.os
 164 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 165 headers_dep := $(top_builddir)include/bits/sysnum.h \
 166         $(top_builddir)include/bits/uClibc_config.h
 167 sub_headers := $(headers_dep)
 168
 169 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 170
 171 # Make sure DESTDIR and PREFIX can be used to install
 172 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 173 ifndef PREFIX
 174 PREFIX = $(DESTDIR)
 175 endif
 176
 177 ifneq ($(HAVE_SHARED),y)
 178 libc :=
 179 interp :=
 180 ldso :=
 181 endif
 182
 183 comma:=,
 184 space:= #
 185
 186 ifeq ($(CROSS_COMPILE),)
 187 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 188 endif
 189
 190 # A nifty macro to make testing gcc features easier
 191 check_gcc=$(shell \
 192         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 193         then echo "$(1)"; else echo "$(2)"; fi)
 194 check_as=$(shell \
 195         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 196         then echo "-Wa,$(1)"; fi)
 197 check_ld=$(shell \
 198         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
 199         then echo "$(1)"; fi)
 200
 201 # Use variable indirection here so that we can have variable
 202 # names with fun chars in them like equal signs
 203 define check-tool-var
 204 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 205 _v = $(2)_$(3)
 206 ifndef $$(_v)
 207 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 208 export $$(_v)
 209 endif
 210 endif
 211 endef
 212
 213 # Usage: check-gcc-var,<flag>
 214 # Check the C compiler to see if it supports <flag>.
 215 # Export the variable CFLAG_<flag> if it does.
 216 define check-gcc-var
 217 $(call check-tool-var,check_gcc,CFLAG,$(1))
 218 endef
 219 # Usage: check-as-var,<flag>
 220 # Check the assembler to see if it supports <flag>.  Export the
 221 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 222 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 223 define check-as-var
 224 $(call check-tool-var,check_as,ASFLAG,$(1))
 225 _v = CFLAG_-Wa$(1)
 226 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 227 endef
 228 # Usage: check-ld-var,<flag>
 229 # Check the linker to see if it supports <flag>.  Export the
 230 # variable LDFLAG_<flag> if it does (for invoking the linker),
 231 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 232 define check-ld-var
 233 $(call check-tool-var,check_ld,LDFLAG,$(1))
 234 _v = CFLAG_-Wl$(1)
 235 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 236 endef
 237 # Usage: cache-output-var,<variable>,<shell command>
 238 # Execute <shell command> and cache the output in <variable>.
 239 define cache-output-var
 240 ifndef $(1)
 241 $(1) := $$(shell $(2))
 242 export $(1)
 243 endif
 244 endef
 245
 246
 247 ARFLAGS:=cr
 248
 249 # Note: The check for -nostdlib has to be before all calls to check_ld
 250 $(eval $(call check-gcc-var,-nostdlib))
 251 $(eval $(call check-gcc-var,-nostartfiles))
 252 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 253 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 254 # failed to merge target specific data of file /dev/null
 255 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 256 $(eval $(call check-ld-var,--no-warn-mismatch))
 257
 258 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 259 GCC_VER := $(subst ., ,$(GCC_VER))
 260 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 261 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 262
 263 # Flags in OPTIMIZATION are used only for non-debug builds
 264
 265 OPTIMIZATION:=
 266 OPTIMIZATION-$(GCC_MAJOR_VER):=
 267 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 268
 269 # Use '-Os' optimization if available, else use -O2, allow Config to override
 270 $(eval $(call check-gcc-var,-Os))
 271 ifneq ($(CFLAG_-Os),)
 272 OPTIMIZATION += $(CFLAG_-Os)
 273 else
 274 $(eval $(call check-gcc-var,-O2))
 275 OPTIMIZATION += $(CFLAG_-O2)
 276 endif
 277 # Use the gcc 3.4 -funit-at-a-time optimization when available
 278 $(eval $(call check-gcc-var,-funit-at-a-time))
 279 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 280 $(eval $(call check-gcc-var,-fstrict-aliasing))
 281 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 282
 283 # CPU_CFLAGS-y contain options which are not warnings,
 284 # not include or library paths, and not optimizations.
 285
 286 # Why -funsigned-char: I hunted a bug related to incorrect
 287 # sign extension of 'char' type for 10 hours straight. Not fun.
 288 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 289
 290 $(eval $(call check-gcc-var,-fno-asm))
 291 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 292 $(eval $(call check-gcc-var,-fmerge-all-constants))
 293 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 294
 295 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 296 ifneq ($(TARGET_ARCH),bfin)
 297 ifneq ($(TARGET_ARCH),lm32)
 298 ifneq ($(TARGET_ARCH),nios2)
 299 ifneq ($(TARGET_ARCH),nds32)
 300 ifneq ($(TARGET_ARCH),sh)
 301 ifneq ($(TARGET_ARCH),c6x)
 302 ifneq ($(TARGET_ARCH),h8300)
 303 ifneq ($(TARGET_ARCH),arc)
 304 ifneq ($(TARGET_ARCH),aarch64)
 305 CPU_CFLAGS-y += -msoft-float
 306 endif
 307 endif
 308 endif
 309 endif
 310 endif
 311 endif
 312 endif
 313 endif
 314 endif
 315 endif
 316
 317 ifeq ($(TARGET_ARCH),aarch64)
 318 CPU_CFLAGS-y += -ftls-model=initial-exec
 319 endif
 320
 321 $(eval $(call check-gcc-var,-std=gnu99))
 322 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 323
 324 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 325 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 326
 327 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 328 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 329
 330 PICFLAG-y := -fPIC
 331 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 332 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 333 PICFLAG := $(PICFLAG-y)
 334 PIEFLAG_NAME:=-fPIE
 335
 336 $(eval $(call check-gcc-var,-fdata-sections))
 337 $(eval $(call check-gcc-var,-ffunction-sections))
 338
 339 # Some nice CPU specific optimizations
 340 ifeq ($(TARGET_ARCH),i386)
 341 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 342         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 343
 344 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 345         # TODO: Change this to a gcc version check.  This bug
 346         # should be fixed with at least gcc-4.3.
 347         # Non-SSE capable processor.
 348         # NB: this may make SSE insns segfault!
 349         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 350         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 351         # -m32 is needed if host is 64-bit
 352         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 353 else
 354 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 355         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 356 endif
 357
 358         # Choice of alignment (please document why!)
 359         #  -falign-labels: in-line labels
 360         #  (reachable by normal code flow, aligning will insert nops
 361         #  which will be executed - may even make things slower)
 362         #  -falign-jumps: reachable only by a jump
 363         # Generic: no alignment at all (smallest code)
 364         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 365         OPTIMIZATION+=$(GCC_FALIGN)
 366
 367         # Putting each function and data object into its own section
 368         # allows for kbytes of less text if users link against static uclibc
 369         # using ld --gc-sections.
 370         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 371         # do not use --gc-sections at shared lib link time.
 372         # However, in combination with sections being sorted by alignment
 373         # it does result in much reduced padding:
 374         #   text    data     bss     dec     hex
 375         # 235319    1472    5992  242783   3b45f old.so
 376         # 234104    1472    5980  241556   3af94 new.so
 377         # Without -ffunction-sections, all functions will get aligned
 378         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 379         # It specifies 4 byte align for .text even if not told to do so:
 380         # Idx Name          Size      VMA       LMA       File off  Algn
 381         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 382         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 383         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 384 $(eval $(call check-ld-var,--sort-section=alignment))
 385         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 386
 387         CPU_LDFLAGS-y+=-m32
 388         CPU_CFLAGS-y+=-m32
 389 endif
 390
 391 ifeq ($(TARGET_ARCH),sparc)
 392         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 393         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 394         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 395         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 396 endif
 397
 398 ifeq ($(TARGET_ARCH),arm)
 399         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 400         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 401 endif
 402
 403 ifeq ($(TARGET_ARCH),metag)
 404         SYMBOL_PREFIX=_
 405         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 406         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 407 endif
 408
 409 ifeq ($(TARGET_ARCH),mips)
 410         OPTIMIZATION+=-mno-split-addresses
 411         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 412         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 413         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 414         CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
 415         CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
 416         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 417 endif
 418
 419 ifeq ($(TARGET_ARCH),nds32)
 420         CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
 421         CFLAGS-.os+= -DPIC
 422         CFLAGS-.oS+= -DPIC
 423 endif
 424
 425 ifeq ($(TARGET_ARCH),sh)
 426 $(eval $(call check-gcc-var,-mprefergot))
 427         OPTIMIZATION += $(CFLAG_-mprefergot)
 428         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 429         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 430         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 431         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 432 ifeq ($(UCLIBC_HAS_FPU),y)
 433         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 434         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 435         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
 436 else
 437         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 438         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 439         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
 440 endif
 441 endif
 442
 443 ifeq ($(TARGET_ARCH),h8300)
 444         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 445         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 446 endif
 447
 448 ifeq ($(TARGET_ARCH),cris)
 449         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 450         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 451         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 452         PICFLAG:=-fpic
 453         PIEFLAG_NAME:=-fpie
 454 endif
 455
 456 ifeq ($(TARGET_ARCH),m68k)
 457         # -fPIC is only supported for 68020 and above.  It is not supported
 458         # for 68000, 68010, or Coldfire.
 459         PICFLAG:=-fpic
 460         PIEFLAG_NAME:=-fpie
 461 endif
 462
 463 ifeq ($(TARGET_ARCH),powerpc)
 464 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 465 # enough. Therefore use -fpic which will reduce code size and generates
 466 # faster code.
 467         PICFLAG:=-fpic
 468         PIEFLAG_NAME:=-fpie
 469         PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 470         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 471         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 472
 473 endif
 474
 475 ifeq ($(TARGET_ARCH),bfin)
 476         SYMBOL_PREFIX=_
 477 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 478         CPU_CFLAGS-y:=-mfdpic
 479         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 480         PICFLAG:=-fpic
 481         PIEFLAG_NAME:=-fpie
 482 endif
 483 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 484         PICFLAG := -mleaf-id-shared-library
 485 endif
 486 endif
 487
 488 ifeq ($(TARGET_ARCH),frv)
 489         # Using -pie causes the program to have an interpreter, which is
 490         # forbidden, so we must make do with -shared.  Unfortunately,
 491         # -shared by itself would get us global function descriptors
 492         # and calls through PLTs, dynamic resolution of symbols, etc,
 493         # which would break as well, but -Bsymbolic comes to the rescue.
 494         CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
 495 endif
 496
 497 ifeq ($(strip $(TARGET_ARCH)),avr32)
 498        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 499        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 500        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 501 endif
 502
 503 ifeq ($(TARGET_ARCH),c6x)
 504         PIEFLAG:=
 505         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 506         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 507         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 508         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 509         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 510 endif
 511
 512 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 513 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 514 ifeq ($(PIEFLAG),)
 515 PIEFLAG := $(PICFLAG)
 516 endif
 517 # We need to keep track of both the CC PIE flag (above) as
 518 # well as the LD PIE flag (below) because we can't rely on
 519 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 520 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 521 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 522
 523 # Check for --as-needed support in linker
 524 ifndef LD_FLAG_ASNEEDED
 525 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 526 ifneq ($(_LD_FLAG_ASNEEDED),)
 527 export LD_FLAG_ASNEEDED:=--as-needed
 528 endif
 529 endif
 530 ifndef LD_FLAG_NO_ASNEEDED
 531 ifdef LD_FLAG_ASNEEDED
 532 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 533 endif
 534 endif
 535 ifndef CC_FLAG_ASNEEDED
 536 ifdef LD_FLAG_ASNEEDED
 537 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 538 endif
 539 endif
 540 ifndef CC_FLAG_NO_ASNEEDED
 541 ifdef LD_FLAG_NO_ASNEEDED
 542 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 543 endif
 544 endif
 545 link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
 546
 547 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 548 ifndef ASNEEDED
 549 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 550 endif
 551
 552 # Add a bunch of extra pedantic annoyingly strict checks
 553 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
 554 ifeq ($(EXTRA_WARNINGS),y)
 555 WARNING_FLAGS += \
 556         -Wformat=2 \
 557         -Wmissing-noreturn \
 558         -Wmissing-format-attribute \
 559         -Wmissing-prototypes \
 560         -Wmissing-declarations \
 561         -Wnested-externs \
 562         -Wnonnull \
 563         -Wold-style-declaration \
 564         -Wold-style-definition \
 565         -Wdeclaration-after-statement \
 566         -Wshadow \
 567         -Wundef
 568 endif
 569 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 570 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 571 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 572
 573 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 574
 575 # Save the tested flag in a single variable and force it to be
 576 # evaluated just once.  Then use that computed value.
 577 $(eval $(call check-gcc-var,-fno-stack-protector))
 578 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 579 ifeq ($(UCLIBC_BUILD_SSP),y)
 580 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 581 $(eval $(call check-gcc-var,-fstack-protector))
 582 $(eval $(call check-gcc-var,-fstack-protector-all))
 583 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 584 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 585 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 586 else
 587 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 588 endif
 589
 590 # Collect all CFLAGS components
 591 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 592         -nostdinc -I$(top_builddir)include \
 593         -I$(top_srcdir)include -include libc-symbols.h \
 594         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 595         -I$(top_srcdir)libc/sysdeps/linux \
 596         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 597         -I$(top_srcdir)ldso/include -I.
 598
 599 # We need this to be checked within libc-symbols.h
 600 ifneq ($(HAVE_SHARED),y)
 601 CFLAGS += -DSTATIC
 602 endif
 603
 604 $(eval $(call check-ld-var,--warn-once))
 605 $(eval $(call check-ld-var,--sort-common))
 606 $(eval $(call check-ld-var,--discard-all))
 607 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 608         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 609
 610 ifeq ($(UCLIBC_BUILD_RELRO),y)
 611 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 612 endif
 613
 614 ifeq ($(UCLIBC_BUILD_NOW),y)
 615 LDFLAGS_NOSTRIP+=-Wl,-z,now
 616 endif
 617
 618 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 619 # Be sure that binutils support it
 620 $(eval $(call check-ld-var,--hash-style=gnu))
 621 ifeq ($(LDFLAG_--hash-style=gnu),)
 622 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 623 $(error Your binutils do not support --hash-style option, while you want to use it)
 624 endif
 625 else
 626 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 627 endif
 628 endif
 629
 630 ifeq ($(DODEBUG),y)
 631 CFLAGS += -O0 -g3 -DDEBUG
 632 else
 633 CFLAGS += $(OPTIMIZATION)
 634 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 635 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 636 $(eval $(call check-ld-var,-O2))
 637 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 638 endif
 639
 640 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 641
 642 ifeq ($(DOSTRIP),y)
 643 LDFLAGS += -Wl,-s
 644 else
 645 STRIPTOOL := true -Stripping_disabled
 646 endif
 647
 648 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 649 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 650 endif
 651 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 652 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 653 endif
 654
 655 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 656 CFLAGS += -D__USE_STDIO_FUTEXES__
 657 endif
 658
 659 ifeq ($(UCLIBC_HAS_THREADS),y)
 660 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 661         PTNAME := nptl
 662         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 663 else
 664 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
 665         PTNAME := linuxthreads
 666 endif
 667 endif
 668 PTDIR := libpthread/$(PTNAME)
 669 # set up system dependencies include dirs (NOTE: order matters!)
 670 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 671 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 672         -I$(top_srcdir)$(PTDIR)                                         \
 673         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 674         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 675         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 676         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 677         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 678         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 679         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 680         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 681         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 682 #
 683 # Test for TLS if NPTL support was selected.
 684 #
 685 GCC_HAS_TLS=$(shell \
 686         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 687 ifneq ($(GCC_HAS_TLS),)
 688 gcc_tls_test_fail:
 689         @echo "####";
 690         @echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
 691         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 692         @echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
 693         @echo "#### about this problem.";
 694         @echo "####";
 695         @echo "#### Exiting...";
 696         @echo "####";
 697         @exit 1;
 698 endif
 699 else
 700 PTINC := \
 701         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 702         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 703         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 704         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 705         -I$(top_srcdir)$(PTDIR) \
 706         -I$(top_srcdir)libpthread
 707 endif
 708 CFLAGS+=$(PTINC)
 709 else
 710         PTNAME :=
 711         PTINC  :=
 712 endif
 713 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 714
 715 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 716 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 717 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 718 CFLAGS += $(CC_INC)
 719
 720 CFLAGS += -I$(KERNEL_HEADERS)
 721
 722 ifneq ($(DOASSERTS),y)
 723 CFLAGS+=-DNDEBUG
 724 endif
 725
 726 ifeq ($(SYMBOL_PREFIX),_)
 727 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 728 endif
 729
 730 # Keep the check_as from being needlessly executed
 731 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 732 $(eval $(call check-as-var,--noexecstack))
 733 endif
 734 ASFLAGS += $(ASFLAG_--noexecstack)
 735
 736 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 737 $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 738 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 739 # with -O0 we (e.g. lockf) might end up with references to
 740 # _Unwind_Resume, so pull in gcc_eh in this case..
 741 # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
 742 # in libgcc.a, so check if the printed file exist, before adding to the commandline
 743 LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
 744 LIBGCC_DIR := $(dir $(LIBGCC_A))
 745 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
 746
 747 # moved from libpthread/linuxthreads
 748 ifeq ($(UCLIBC_CTOR_DTOR),y)
 749 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 750 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 751 endif
 752
 753 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 754
 755 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"