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' 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=arm-linux-
  40 # will build uClibc for 'arm'.
  41
  42 ifndef CROSS
  43 CROSS=
  44 endif
  45 CC         = $(CROSS)gcc
  46 AR         = $(CROSS)ar
  47 LD         = $(CROSS)ld
  48 NM         = $(CROSS)nm
  49 STRIPTOOL  = $(CROSS)strip
  50
  51 INSTALL    = install
  52 LN         = ln
  53 RM         = rm -f
  54 TAR        = tar
  55 SED        = sed
  56 AWK        = awk
  57
  58 STRIP_FLAGS ?= -x -R .note -R .comment
  59
  60 ## unused? if yes, remove after 0.9.31
  61 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  62
  63 # Select the compiler needed to build binaries for your development system
  64 HOSTCC     = gcc
  65 BUILD_CFLAGS = -Os -Wall
  66 SUBARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \
  67                                   -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  68                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
  69                                   -e s/sh.*/sh/ \
  70                                   -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  71                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  72                                   -e s/xtensa.*/xtensa/ )
  73 ARCH ?= $(SUBARCH)
  74 export ARCH
  75
  76 #---------------------------------------------------------
  77 # Nothing beyond this point should ever be touched by mere
  78 # mortals.  Unless you hang out with the gods, you should
  79 # probably leave all this stuff alone.
  80
  81
  82 # Pull in the user's uClibc configuration
  83 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  84 -include $(top_builddir).config
  85 endif
  86
  87 # Make certain these contain a final "/", but no "//"s.
  88 TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_ARCH=//' -e 's/"//g')
  89 TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
  90 TARGET_SUBARCH:=$(shell grep -s '^TARGET_SUBARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_SUBARCH=//' -e 's/"//g')
  91 TARGET_SUBARCH:=$(strip $(subst ",, $(strip $(TARGET_SUBARCH))))
  92 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
  93 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
  94 KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_HEADERS))))))
  95 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS
  96
  97
  98 # Now config hard core
  99 MAJOR_VERSION := 0
 100 MINOR_VERSION := 9
 101 SUBLEVEL      := 30
 102 EXTRAVERSION  :=-git
 103 VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
 104 ifneq ($(EXTRAVERSION),)
 105 VERSION       := $(VERSION)$(EXTRAVERSION)
 106 endif
 107 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 108 LC_ALL := C
 109 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
 110
 111 LIBC := libc
 112 SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
 113 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
 114 UCLIBC_LDSO_NAME := ld64-uClibc
 115 ARCH_NATIVE_BIT := 64
 116 else
 117 UCLIBC_LDSO_NAME := ld-uClibc
 118 ARCH_NATIVE_BIT := 32
 119 endif
 120 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
 121 NONSHARED_LIBNAME := uclibc_nonshared.a
 122 libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
 123 libc.depend := $(top_builddir)lib/$(SHARED_MAJORNAME:.$(MAJOR_VERSION)=)
 124 interp := $(top_builddir)lib/interp.os
 125 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 126 headers_dep := $(top_builddir)include/bits/sysnum.h
 127 sub_headers := $(headers_dep)
 128
 129 #LIBS :=$(interp) -L$(top_builddir)lib -lc
 130 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
 131
 132 # Make sure DESTDIR and PREFIX can be used to install
 133 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 134 ifndef PREFIX
 135 PREFIX = $(DESTDIR)
 136 endif
 137
 138 ifneq ($(HAVE_SHARED),y)
 139 libc :=
 140 interp :=
 141 ldso :=
 142 endif
 143
 144 comma:=,
 145 space:= #
 146
 147 ifndef CROSS
 148 CROSS=$(strip $(subst ",, $(CROSS_COMPILER_PREFIX)))
 149 endif
 150
 151 # A nifty macro to make testing gcc features easier
 152 check_gcc=$(shell \
 153         if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 154         then echo "$(1)"; else echo "$(2)"; fi)
 155 check_as=$(shell \
 156         if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
 157         then echo "-Wa,$(1)"; fi)
 158 check_ld=$(shell \
 159         if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
 160         then echo "$(1)"; fi)
 161
 162 ARFLAGS:=cr
 163
 164
 165 # Flags in OPTIMIZATION are used only for non-debug builds
 166
 167 OPTIMIZATION:=
 168 # Use '-Os' optimization if available, else use -O2, allow Config to override
 169 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
 170 # Use the gcc 3.4 -funit-at-a-time optimization when available
 171 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
 172
 173 GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
 174 #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
 175
 176 ifeq ($(GCC_MAJOR_VER),4)
 177 # shrinks code, results are from 4.0.2
 178 # 0.36%
 179 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
 180 # 0.34%
 181 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
 182 # 0.1%
 183 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
 184 endif
 185
 186
 187 # CPU_CFLAGS-y contain options which are not warnings,
 188 # not include or library paths, and not optimizations.
 189
 190 # Why -funsigned-char: I hunted a bug related to incorrect
 191 # sign extension of 'char' type for 10 hours straight. Not fun.
 192 CPU_CFLAGS-y := -funsigned-char -fno-builtin
 193
 194 CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
 195
 196 LDADD_LIBFLOAT=
 197 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 198 # If -msoft-float isn't supported, we want an error anyway.
 199 # Hmm... might need to revisit this for arm since it has 2 different
 200 # soft float encodings.
 201 ifneq ($(TARGET_ARCH),nios)
 202 ifneq ($(TARGET_ARCH),nios2)
 203 ifneq ($(TARGET_ARCH),sh)
 204 CPU_CFLAGS-y += -msoft-float
 205 endif
 206 endif
 207 endif
 208 ifeq ($(TARGET_ARCH),arm)
 209 # No longer needed with current toolchains, but leave it here for now.
 210 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
 211 #    LDADD_LIBFLOAT=-lfloat
 212 endif
 213 endif
 214
 215 CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
 216
 217 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 218 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 219
 220 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 221 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 222
 223 PICFLAG-y := -fPIC
 224 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 225 PICFLAG := $(PICFLAG-y)
 226 PIEFLAG_NAME:=-fPIE
 227
 228 # Some nice CPU specific optimizations
 229 ifeq ($(TARGET_ARCH),i386)
 230         OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
 231
 232 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
 233         # Non-SSE capable processor.
 234         # NB: this may make SSE insns segfault!
 235         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 236         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 237         # -m32 is needed if host is 64-bit
 238         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 239 else
 240         OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
 241 endif
 242
 243         # Choice of alignment (please document why!)
 244         #  -falign-labels: in-line labels
 245         #  (reachable by normal code flow, aligning will insert nops
 246         #  which will be executed - may even make things slower)
 247         #  -falign-jumps: reachable only by a jump
 248         # Generic: no alignment at all (smallest code)
 249         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 250 ifeq ($(CONFIG_K7),y)
 251         # Align functions to four bytes, use default for jumps and loops (why?)
 252         GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
 253 endif
 254 ifeq ($(CONFIG_CRUSOE),y)
 255         # Use compiler's default for functions, jumps and loops (why?)
 256         GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
 257 endif
 258 ifeq ($(CONFIG_CYRIXIII),y)
 259         # Use compiler's default for functions, jumps and loops (why?)
 260         GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
 261 endif
 262         OPTIMIZATION+=$(GCC_FALIGN)
 263
 264         # Putting each function and data object into its own section
 265         # allows for kbytes of less text if users link against static uclibc
 266         # using ld --gc-sections.
 267         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 268         # do not use --gc-sections at shared lib link time.
 269         # However, in combination with sections being sorted by alignment
 270         # it does result in much reduced padding:
 271         #   text    data     bss     dec     hex
 272         # 235319    1472    5992  242783   3b45f old.so
 273         # 234104    1472    5980  241556   3af94 new.so
 274         # Without -ffunction-sections, all functions will get aligned
 275         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 276         # It specifies 4 byte align for .text even if not told to do so:
 277         # Idx Name          Size      VMA       LMA       File off  Algn
 278         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 279         CPU_CFLAGS-y  += $(call check_gcc,-ffunction-sections -fdata-sections,)
 280 ifneq ($(call check_ld,--sort-common,),)
 281         CPU_LDFLAGS-y += -Wl,--sort-common
 282 endif
 283 ifneq ($(call check_ld,--sort-section alignment),)
 284         CPU_LDFLAGS-y += -Wl,--sort-section,alignment
 285 endif
 286
 287         CPU_LDFLAGS-y+=-m32
 288         CPU_CFLAGS-y+=-m32
 289         CPU_CFLAGS-$(CONFIG_386)+=-march=i386
 290         CPU_CFLAGS-$(CONFIG_486)+=-march=i486
 291         CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
 292         CPU_CFLAGS-$(CONFIG_586)+=-march=i586
 293         CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
 294         CPU_CFLAGS-$(CONFIG_686)+=-march=i686
 295         CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
 296         CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
 297         CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
 298         CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
 299         CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
 300         CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
 301         CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
 302         CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
 303         CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
 304         CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
 305 endif
 306
 307 ifeq ($(TARGET_ARCH),sparc)
 308         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 309         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 310         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 311         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 312 endif
 313
 314 ifeq ($(TARGET_ARCH),arm)
 315         OPTIMIZATION+=-fstrict-aliasing
 316         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 317         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 318         CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
 319         CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
 320         CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
 321         CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
 322         CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
 323         CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
 324         CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
 325         CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
 326         CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
 327         CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
 328         CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
 329         CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
 330         CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
 331         CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
 332         CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
 333         CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
 334         CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
 335         CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
 336         CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
 337 endif
 338
 339 ifeq ($(TARGET_ARCH),mips)
 340         CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
 341         CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
 342         CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
 343         CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
 344         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
 345         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
 346         CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
 347         ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
 348                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
 349                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
 350         endif
 351         ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
 352                 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
 353                 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
 354         endif
 355         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 356         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 357         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 358 endif
 359
 360 ifeq ($(TARGET_ARCH),nios)
 361         CPU_LDFLAGS-y+=-Wl,-m32
 362         CPU_CFLAGS-y+=-Wl,-m32
 363 endif
 364
 365 ifeq ($(TARGET_ARCH),sh)
 366         OPTIMIZATION+=-fstrict-aliasing
 367         OPTIMIZATION+= $(call check_gcc,-mprefergot,)
 368         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 369         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 370         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 371         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 372 ifeq ($(UCLIBC_HAS_FPU),y)
 373         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 374         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 375 else
 376         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 377         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 378 endif
 379 endif
 380
 381 ifeq ($(TARGET_ARCH),sh64)
 382         OPTIMIZATION+=-fstrict-aliasing
 383         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
 384         CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
 385         CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
 386 endif
 387
 388 ifeq ($(TARGET_ARCH),h8300)
 389         SYMBOL_PREFIX=_
 390         CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
 391         CPU_LDFLAGS-$(CONFIG_H8S)   += -Wl,-ms8300s
 392         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 393         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 394 endif
 395
 396 ifeq ($(TARGET_ARCH),cris)
 397         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 398         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 399         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 400         PICFLAG:=-fpic
 401         PIEFLAG_NAME:=-fpie
 402 endif
 403
 404 ifeq ($(TARGET_ARCH),m68k)
 405         # -fPIC is only supported for 68020 and above.  It is not supported
 406         # for 68000, 68010, or Coldfire.
 407         PICFLAG:=-fpic
 408         PIEFLAG_NAME:=-fpie
 409 endif
 410
 411 ifeq ($(TARGET_ARCH),powerpc)
 412 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 413 # enough. Therefore use -fpic which will reduce code size and generates
 414 # faster code.
 415         PICFLAG:=-fpic
 416         PIEFLAG_NAME:=-fpie
 417         PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 418         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 419         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 420
 421 endif
 422
 423 ifeq ($(TARGET_ARCH),bfin)
 424         SYMBOL_PREFIX=_
 425 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 426         CPU_CFLAGS-y:=-mfdpic
 427         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 428         PICFLAG:=-fpic
 429         PIEFLAG_NAME:=-fpie
 430 endif
 431 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 432         PICFLAG := -mleaf-id-shared-library
 433 endif
 434 endif
 435
 436 ifeq ($(TARGET_ARCH),frv)
 437         CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
 438         # Using -pie causes the program to have an interpreter, which is
 439         # forbidden, so we must make do with -shared.  Unfortunately,
 440         # -shared by itself would get us global function descriptors
 441         # and calls through PLTs, dynamic resolution of symbols, etc,
 442         # which would break as well, but -Bsymbolic comes to the rescue.
 443         export LDPIEFLAG:=-shared -Wl,-Bsymbolic
 444         UCLIBC_LDSO=ld.so.1
 445 endif
 446
 447 ifeq ($(strip $(TARGET_ARCH)),avr32)
 448        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 449        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 450        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 451 endif
 452
 453 ifeq ($(TARGET_ARCH),i960)
 454       SYMBOL_PREFIX=_
 455 endif
 456
 457 ifeq ($(TARGET_ARCH),microblaze)
 458       SYMBOL_PREFIX=_
 459 endif
 460
 461 ifeq ($(TARGET_ARCH),v850)
 462       SYMBOL_PREFIX=_
 463 endif
 464
 465 # Keep the check_gcc from being needlessly executed
 466 ifndef PIEFLAG
 467 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
 468 endif
 469 # We need to keep track of both the CC PIE flag (above) as
 470 # well as the LD PIE flag (below) because we can't rely on
 471 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 472 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 473 ifndef LDPIEFLAG
 474 export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
 475 endif
 476
 477 # Check for --as-needed support in linker
 478 ifndef LD_FLAG_ASNEEDED
 479 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
 480 ifneq ($(_LD_FLAG_ASNEEDED),)
 481 export LD_FLAG_ASNEEDED:=--as-needed
 482 endif
 483 endif
 484 ifndef LD_FLAG_NO_ASNEEDED
 485 ifdef LD_FLAG_ASNEEDED
 486 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 487 endif
 488 endif
 489 ifndef CC_FLAG_ASNEEDED
 490 ifdef LD_FLAG_ASNEEDED
 491 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 492 endif
 493 endif
 494 ifndef CC_FLAG_NO_ASNEEDED
 495 ifdef LD_FLAG_NO_ASNEEDED
 496 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 497 endif
 498 endif
 499 link.asneeded = $(if $(and $(CC_FLAG_ASNEEDED),$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
 500
 501 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 502 ifndef ASNEEDED
 503 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 504 endif
 505
 506 # Add a bunch of extra pedantic annoyingly strict checks
 507 XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
 508 ifeq ($(EXTRA_WARNINGS),y)
 509 XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
 510 XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
 511 XWARNINGS+=-Wnonnull -Wundef
 512 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
 513 #XWARNINGS+=-Wdeclaration-after-statement
 514 endif
 515 # Seems to be unused (no ARCH_CFLAGS anywhere), delete?
 516 # if yes, remove after 0.9.31
 517 XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
 518 CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
 519
 520 SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
 521 ifeq ($(UCLIBC_BUILD_SSP),y)
 522 SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
 523 SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
 524 SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
 525 else
 526 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 527 endif
 528
 529 NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
 530
 531 # Collect all CFLAGS components
 532 CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
 533         $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 534         -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
 535         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
 536 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 537 CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
 538 endif
 539
 540 # We need this to be checked within libc-symbols.h
 541 ifneq ($(HAVE_SHARED),y)
 542 CFLAGS += -DSTATIC
 543 endif
 544
 545 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
 546         -Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
 547 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 548 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
 549
 550 ifeq ($(UCLIBC_BUILD_RELRO),y)
 551 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 552 endif
 553
 554 ifeq ($(UCLIBC_BUILD_NOW),y)
 555 LDFLAGS_NOSTRIP+=-Wl,-z,now
 556 endif
 557
 558 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 559 # Be sure that binutils support it
 560 LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
 561 ifeq ($(LDFLAGS_GNUHASH),)
 562 ifneq ($(filter-out install_headers headers-y,$(MAKECMDGOALS)),)
 563 $(error Your binutils don't support --hash-style option, while you want to use it)
 564 endif
 565 else
 566 LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
 567 endif
 568 endif
 569
 570 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 571 ifeq ($(DODEBUG),y)
 572 CFLAGS += -O0 -g3
 573 else
 574 CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
 575 endif
 576 ifeq ($(DOSTRIP),y)
 577 LDFLAGS += -Wl,-s
 578 else
 579 STRIPTOOL := true -Stripping_disabled
 580 endif
 581
 582 ifeq ($(DOMULTI),y)
 583 # we try to compile all sources at once into an object (IMA), but
 584 # gcc-3.3.x does not support it
 585 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
 586 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
 587 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
 588 ifeq ($(GCC_MAJOR_VER),3)
 589 DOMULTI:=n
 590 else
 591 CFLAGS+=$(call check_gcc,--combine,)
 592 endif
 593 else
 594 DOMULTI:=n
 595 endif
 596
 597 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 598 LDFLAGS += $(subst ",, $(UCLIBC_EXTRA_LDFLAGS))
 599 endif
 600
 601 ifeq ($(UCLIBC_HAS_THREADS),y)
 602 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 603         PTNAME := nptl
 604 else
 605 ifeq ($(LINUXTHREADS_OLD),y)
 606         PTNAME := linuxthreads.old
 607 else
 608         PTNAME := linuxthreads
 609 endif
 610 endif
 611 PTDIR := libpthread/$(PTNAME)
 612 # set up system dependencies include dirs (NOTE: order matters!)
 613 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 614 PTINC:= -I$(top_srcdir)$(PTDIR)                                         \
 615         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 616         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 617         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 618         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 619         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                            \
 620         -I$(top_srcdir)$(PTDIR)/sysdeps/generic                         \
 621         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH)                 \
 622         -I$(top_srcdir)ldso/include
 623 #
 624 # Test for TLS if NPTL support was selected.
 625 #
 626 GCC_HAS_TLS=$(shell \
 627         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 628 ifneq ($(GCC_HAS_TLS),)
 629 gcc_tls_test_fail:
 630         @echo "####";
 631         @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
 632         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 633         @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
 634         @echo "#### about this problem.";
 635         @echo "####";
 636         @echo "#### Exiting...";
 637         @echo "####";
 638         @exit 1;
 639 endif
 640 else
 641 PTINC := \
 642         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 643         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 644         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 645         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 646         -I$(top_srcdir)$(PTDIR) \
 647         -I$(top_srcdir)libpthread
 648 endif
 649 CFLAGS+=$(PTINC)
 650 else
 651         PTNAME :=
 652         PTINC  :=
 653 endif
 654 CFLAGS += -I$(KERNEL_HEADERS)
 655
 656 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 657 CC_IPREFIX := $(shell $(CC) --print-file-name=include)
 658 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 659 CFLAGS += $(CC_INC)
 660
 661 ifneq ($(DOASSERTS),y)
 662 CFLAGS+=-DNDEBUG
 663 endif
 664
 665 ifeq ($(SYMBOL_PREFIX),_)
 666 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 667 endif
 668
 669 # Keep the check_as from being needlessly executed
 670 ifndef ASFLAGS_NOEXEC
 671 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 672 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
 673 else
 674 export ASFLAGS_NOEXEC :=
 675 endif
 676 endif
 677 ASFLAGS = $(ASFLAGS_NOEXEC)
 678
 679 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 680 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
 681 LIBGCC_DIR:=$(dir $(LIBGCC))
 682
 683 # moved from libpthread/linuxthreads
 684 ifeq ($(UCLIBC_CTOR_DTOR),y)
 685 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 686 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 687 endif
 688
 689 LOCAL_INSTALL_PATH := install_dir