Rules.mak

   1 # Rules.mak for uClibc-ng
   2 #
   3 # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
   4 # Copyright (C) 2015-2022 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      := 42
 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 := $(call qstrip,$(TARGET_LDSO_NAME))
 146 ARCH_NATIVE_BIT := $(call qstrip,$(TARGET_ARCH_BITS))
 147
 148 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
 149 NONSHARED_LIBNAME := uclibc_nonshared.a
 150 NONSHARED_LIBPTHREAD := libpthread_nonshared.a
 151
 152 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
 153 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
 154 interp := $(top_builddir)lib/interp.os
 155 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 156 headers_dep := $(top_builddir)include/bits/sysnum.h \
 157         $(top_builddir)include/bits/uClibc_config.h
 158 sub_headers := $(headers_dep)
 159
 160 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
 161
 162 # Make sure DESTDIR and PREFIX can be used to install
 163 # PREFIX is a uClibcism while DESTDIR is a common GNUism
 164 ifndef PREFIX
 165 PREFIX = $(DESTDIR)
 166 endif
 167
 168 ifneq ($(HAVE_SHARED),y)
 169 libc :=
 170 interp :=
 171 ldso :=
 172 endif
 173
 174 comma:=,
 175 space:= #
 176
 177 ifeq ($(CROSS_COMPILE),)
 178 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 179 endif
 180
 181 # A nifty macro to make testing gcc features easier
 182 check_gcc=$(shell \
 183         tf="/tmp/cgccucl$$$$.o"; \
 184         if $(CC) $(1) -S -o $$tf -xc /dev/null > /dev/null 2>&1; \
 185         then echo "$(1)"; else echo "$(2)"; fi; rm -f $$tf )
 186 check_as=$(shell \
 187         tf="/tmp/casucl$$$$.o"; \
 188         if $(CC) -Wa,$(1) -Wa,-Z -c -o $$tf -xassembler /dev/null > /dev/null 2>&1; \
 189         then echo "-Wa,$(1)"; fi; rm -f $$tf )
 190 check_ld=$(shell \
 191         tf="/tmp/clducl$$$$.c"; echo "int _start(){return 0;}int main(){return 0;}" >$$tf; \
 192         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null $$tf > /dev/null 2>&1; \
 193         then echo "$(1)"; fi; rm -f $$tf )
 194
 195 # Use variable indirection here so that we can have variable
 196 # names with fun chars in them like equal signs
 197 define check-tool-var
 198 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 199 _v = $(2)_$(3)
 200 ifndef $$(_v)
 201 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 202 export $$(_v)
 203 endif
 204 endif
 205 endef
 206
 207 # Usage: check-gcc-var,<flag>
 208 # Check the C compiler to see if it supports <flag>.
 209 # Export the variable CFLAG_<flag> if it does.
 210 define check-gcc-var
 211 $(call check-tool-var,check_gcc,CFLAG,$(1))
 212 endef
 213 # Usage: check-as-var,<flag>
 214 # Check the assembler to see if it supports <flag>.  Export the
 215 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 216 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 217 define check-as-var
 218 $(call check-tool-var,check_as,ASFLAG,$(1))
 219 _v = CFLAG_-Wa$(1)
 220 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 221 endef
 222 # Usage: check-ld-var,<flag>
 223 # Check the linker to see if it supports <flag>.  Export the
 224 # variable LDFLAG_<flag> if it does (for invoking the linker),
 225 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 226 define check-ld-var
 227 $(call check-tool-var,check_ld,LDFLAG,$(1))
 228 _v = CFLAG_-Wl$(1)
 229 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 230 endef
 231 # Usage: cache-output-var,<variable>,<shell command>
 232 # Execute <shell command> and cache the output in <variable>.
 233 define cache-output-var
 234 ifndef $(1)
 235 $(1) := $$(shell $(2))
 236 export $(1)
 237 endif
 238 endef
 239
 240
 241 ARFLAGS:=cr
 242
 243 # Note: The check for -nostdlib has to be before all calls to check_ld
 244 $(eval $(call check-gcc-var,-nostdlib))
 245 $(eval $(call check-gcc-var,-nostartfiles))
 246 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 247 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 248 # failed to merge target specific data of file /dev/null
 249 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 250 $(eval $(call check-ld-var,--no-warn-mismatch))
 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 # Flags in OPTIMIZATION are used only for non-debug builds
 258
 259 OPTIMIZATION:=
 260 OPTIMIZATION-$(GCC_MAJOR_VER):=
 261 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 262
 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-3.4 += $(CFLAG_-funit-at-a-time)
 274 $(eval $(call check-gcc-var,-fstrict-aliasing))
 275 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 276
 277 # CPU_CFLAGS-y contain options which are not warnings,
 278 # not include or library paths, and not optimizations.
 279
 280 # Why -funsigned-char: I hunted a bug related to incorrect
 281 # sign extension of 'char' type for 10 hours straight. Not fun.
 282 CPU_CFLAGS-y := -funsigned-char -fno-builtin -fcommon
 283
 284 $(eval $(call check-gcc-var,-fno-asm))
 285 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 286 $(eval $(call check-gcc-var,-fmerge-all-constants))
 287 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 288
 289 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 290 ifneq ($(TARGET_ARCH),bfin)
 291 ifneq ($(TARGET_ARCH),lm32)
 292 ifneq ($(TARGET_ARCH),nios2)
 293 ifneq ($(TARGET_ARCH),nds32)
 294 ifneq ($(TARGET_ARCH),sh)
 295 ifneq ($(TARGET_ARCH),c6x)
 296 ifneq ($(TARGET_ARCH),h8300)
 297 ifneq ($(TARGET_ARCH),arc)
 298 ifneq ($(TARGET_ARCH),aarch64)
 299 CPU_CFLAGS-y += -msoft-float
 300 endif
 301 endif
 302 endif
 303 endif
 304 endif
 305 endif
 306 endif
 307 endif
 308 endif
 309 endif
 310
 311 ifeq ($(TARGET_ARCH),aarch64)
 312 CPU_CFLAGS-y += -ftls-model=initial-exec
 313 endif
 314
 315 $(eval $(call check-gcc-var,-std=gnu99))
 316 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 317
 318 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 319 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 320
 321 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 322 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 323
 324 PICFLAG-y := -fPIC
 325 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 326 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 327 PICFLAG := $(PICFLAG-y)
 328 PIEFLAG_NAME:=-fPIE
 329
 330 $(eval $(call check-gcc-var,-fdata-sections))
 331 $(eval $(call check-gcc-var,-ffunction-sections))
 332
 333 # Some nice CPU specific optimizations
 334 ifeq ($(TARGET_ARCH),i386)
 335 $(eval $(call check-gcc-var,-fomit-frame-pointer))
 336         OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
 337
 338 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 339         # TODO: Change this to a gcc version check.  This bug
 340         # should be fixed with at least gcc-4.3.
 341         # Non-SSE capable processor.
 342         # NB: this may make SSE insns segfault!
 343         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 344         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 345         # -m32 is needed if host is 64-bit
 346         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 347 else
 348 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 349         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 350 endif
 351
 352         # Choice of alignment (please document why!)
 353         #  -falign-labels: in-line labels
 354         #  (reachable by normal code flow, aligning will insert nops
 355         #  which will be executed - may even make things slower)
 356         #  -falign-jumps: reachable only by a jump
 357         # Generic: no alignment at all (smallest code)
 358         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 359         OPTIMIZATION+=$(GCC_FALIGN)
 360
 361         # Putting each function and data object into its own section
 362         # allows for kbytes of less text if users link against static uclibc
 363         # using ld --gc-sections.
 364         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 365         # do not use --gc-sections at shared lib link time.
 366         # However, in combination with sections being sorted by alignment
 367         # it does result in much reduced padding:
 368         #   text    data     bss     dec     hex
 369         # 235319    1472    5992  242783   3b45f old.so
 370         # 234104    1472    5980  241556   3af94 new.so
 371         # Without -ffunction-sections, all functions will get aligned
 372         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 373         # It specifies 4 byte align for .text even if not told to do so:
 374         # Idx Name          Size      VMA       LMA       File off  Algn
 375         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 376         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 377         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 378 $(eval $(call check-ld-var,--sort-section=alignment))
 379         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 380
 381         CPU_LDFLAGS-y+=-m32
 382         CPU_CFLAGS-y+=-m32
 383 endif
 384
 385 ifeq ($(TARGET_ARCH),sparc)
 386         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 387         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 388         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 389         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 390 endif
 391
 392 ifeq ($(TARGET_ARCH),arm)
 393         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 394         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 395 endif
 396
 397 ifeq ($(TARGET_ARCH),metag)
 398         SYMBOL_PREFIX=_
 399         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 400         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 401 endif
 402
 403 ifeq ($(TARGET_ARCH),mips)
 404         OPTIMIZATION+=-mno-split-addresses
 405         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 406         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 407         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 408         CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
 409         CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
 410         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 411 endif
 412
 413 ifeq ($(TARGET_ARCH),nds32)
 414         CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
 415         CFLAGS-.os+= -DPIC
 416         CFLAGS-.oS+= -DPIC
 417 endif
 418
 419 ifeq ($(TARGET_ARCH),sh)
 420 $(eval $(call check-gcc-var,-mprefergot))
 421         OPTIMIZATION += $(CFLAG_-mprefergot)
 422         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 423         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 424         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 425         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 426 ifeq ($(UCLIBC_HAS_FPU),y)
 427         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 428         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 429         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
 430 else
 431         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 432         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 433         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
 434 endif
 435 endif
 436
 437 ifeq ($(TARGET_ARCH),h8300)
 438         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 439         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 440 endif
 441
 442 ifeq ($(TARGET_ARCH),cris)
 443         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 444         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 445         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 446         PICFLAG:=-fpic
 447         PIEFLAG_NAME:=-fpie
 448 endif
 449
 450 ifeq ($(TARGET_ARCH),csky)
 451         # In csky gas implement, we use $t and $d to detect .text or literal pool.
 452         # So we couldn't strip them for objdump.
 453         STRIP_FLAGS += -K "$$"t -K "$$"d
 454
 455         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)        += -mlittle-endian
 456         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)           += -mbig-endian
 457 endif
 458
 459 ifeq ($(TARGET_ARCH),kvx)
 460         CPU_CFLAGS-$(CONFIG_KVX) += -march=kvx
 461 endif
 462
 463 ifeq ($(TARGET_ARCH),m68k)
 464         # -fPIC is only supported for 68020 and above.  It is not supported
 465         # for 68000, 68010, or Coldfire.
 466         PICFLAG:=-fpic
 467         PIEFLAG_NAME:=-fpie
 468 endif
 469
 470 ifeq ($(TARGET_ARCH),powerpc)
 471 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 472 # enough. Therefore use -fpic which will reduce code size and generates
 473 # faster code.
 474         PICFLAG:=-fpic
 475         PIEFLAG_NAME:=-fpie
 476         PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 477         PPC_HAS_SECUREPLT:=$(shell $(CC) --verbose 2>&1 | grep -- --enable-secureplt > /dev/null && echo -n y || echo -n n)
 478         CPU_CFLAGS-$(PPC_HAS_SECUREPLT) += -DPPC_HAS_SECUREPLT
 479         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 480         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 481 endif
 482
 483 ifeq ($(TARGET_ARCH),bfin)
 484         SYMBOL_PREFIX=_
 485 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 486         CPU_CFLAGS-y:=-mfdpic
 487         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 488         PICFLAG:=-fpic
 489         PIEFLAG_NAME:=-fpie
 490 endif
 491 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 492         PICFLAG := -mleaf-id-shared-library
 493 endif
 494 endif
 495
 496 ifeq ($(TARGET_ARCH),frv)
 497         # Using -pie causes the program to have an interpreter, which is
 498         # forbidden, so we must make do with -shared.  Unfortunately,
 499         # -shared by itself would get us global function descriptors
 500         # and calls through PLTs, dynamic resolution of symbols, etc,
 501         # which would break as well, but -Bsymbolic comes to the rescue.
 502         CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
 503 endif
 504
 505 ifeq ($(strip $(TARGET_ARCH)),avr32)
 506        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 507        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 508        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 509 endif
 510
 511 ifeq ($(TARGET_ARCH),c6x)
 512         PIEFLAG:=
 513         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 514         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 515         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 516         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 517         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 518 endif
 519
 520 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 521 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 522 ifeq ($(PIEFLAG),)
 523 PIEFLAG := $(PICFLAG)
 524 endif
 525 # We need to keep track of both the CC PIE flag (above) as
 526 # well as the LD PIE flag (below) because we can't rely on
 527 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 528 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 529 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 530
 531 # Check for --as-needed support in linker
 532 ifndef LD_FLAG_ASNEEDED
 533 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 534 ifneq ($(_LD_FLAG_ASNEEDED),)
 535 export LD_FLAG_ASNEEDED:=--as-needed
 536 endif
 537 endif
 538 ifndef LD_FLAG_NO_ASNEEDED
 539 ifdef LD_FLAG_ASNEEDED
 540 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 541 endif
 542 endif
 543 ifndef CC_FLAG_ASNEEDED
 544 ifdef LD_FLAG_ASNEEDED
 545 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 546 endif
 547 endif
 548 ifndef CC_FLAG_NO_ASNEEDED
 549 ifdef LD_FLAG_NO_ASNEEDED
 550 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 551 endif
 552 endif
 553 link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
 554
 555 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 556 ifndef ASNEEDED
 557 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 558 endif
 559
 560 # Add a bunch of extra pedantic annoyingly strict checks
 561 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing -Wno-nonnull-compare
 562 ifeq ($(EXTRA_WARNINGS),y)
 563 WARNING_FLAGS += \
 564         -Wnonnull-compare \
 565         -Wnodeclaration-after-statement \
 566         -Wformat=2 \
 567         -Wmissing-noreturn \
 568         -Wmissing-format-attribute \
 569         -Wmissing-prototypes \
 570         -Wmissing-declarations \
 571         -Wnested-externs \
 572         -Wnonnull \
 573         -Wold-style-declaration \
 574         -Wold-style-definition \
 575         -Wshadow \
 576         -Wundef
 577 endif
 578 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 579 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 580 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 581
 582 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 583
 584 # Save the tested flag in a single variable and force it to be
 585 # evaluated just once.  Then use that computed value.
 586 $(eval $(call check-gcc-var,-fno-stack-protector))
 587 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 588 ifeq ($(UCLIBC_BUILD_SSP),y)
 589 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 590 $(eval $(call check-gcc-var,-fstack-protector))
 591 $(eval $(call check-gcc-var,-fstack-protector-all))
 592 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 593 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 594 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 595 else
 596 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 597 endif
 598
 599 # Collect all CFLAGS components
 600 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 601         -nostdinc -I$(top_builddir)include \
 602         -I$(top_srcdir)include -include libc-symbols.h \
 603         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 604         -I$(top_srcdir)libc/sysdeps/linux \
 605         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 606         -I$(top_srcdir)ldso/include -I.
 607
 608 # We need this to be checked within libc-symbols.h
 609 ifneq ($(HAVE_SHARED),y)
 610 CFLAGS += -DSTATIC
 611 endif
 612
 613 $(eval $(call check-ld-var,--warn-once))
 614 $(eval $(call check-ld-var,--sort-common))
 615 $(eval $(call check-ld-var,--discard-all))
 616 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 617         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 618
 619 ifeq ($(UCLIBC_BUILD_RELRO),y)
 620 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 621 endif
 622
 623 ifeq ($(UCLIBC_BUILD_NOW),y)
 624 LDFLAGS_NOSTRIP+=-Wl,-z,now
 625 endif
 626
 627 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 628 # Be sure that binutils support it
 629 $(eval $(call check-ld-var,--hash-style=gnu))
 630 ifeq ($(LDFLAG_--hash-style=gnu),)
 631 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 632 $(error Your binutils do not support --hash-style option, while you want to use it)
 633 endif
 634 else
 635 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 636 endif
 637 endif
 638
 639 ifeq ($(DODEBUG),y)
 640 CFLAGS += -O0 -g3 -DDEBUG
 641 else
 642 CFLAGS += $(OPTIMIZATION)
 643 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 644 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 645 $(eval $(call check-ld-var,-O2))
 646 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 647 endif
 648
 649 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 650
 651 ifeq ($(DOSTRIP),y)
 652 LDFLAGS += -Wl,-s
 653 else
 654 STRIPTOOL := true -Stripping_disabled
 655 endif
 656
 657 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 658 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 659 endif
 660 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 661 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 662 endif
 663
 664 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 665 CFLAGS += -D__USE_STDIO_FUTEXES__
 666 endif
 667
 668 ifeq ($(UCLIBC_HAS_THREADS),y)
 669 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 670         PTNAME := nptl
 671         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 672 else
 673 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
 674         PTNAME := linuxthreads
 675 endif
 676 endif
 677 PTDIR := libpthread/$(PTNAME)
 678 # set up system dependencies include dirs (NOTE: order matters!)
 679 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 680 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 681         -I$(top_srcdir)$(PTDIR)                                         \
 682         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 683         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 684         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 685         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 686         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 687         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 688         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 689         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 690         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 691 #
 692 # Test for TLS if NPTL support was selected.
 693 #
 694 GCC_HAS_TLS=$(shell \
 695         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 696 ifneq ($(GCC_HAS_TLS),)
 697 gcc_tls_test_fail:
 698         @echo "####";
 699         @echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
 700         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 701         @echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
 702         @echo "#### about this problem.";
 703         @echo "####";
 704         @echo "#### Exiting...";
 705         @echo "####";
 706         @exit 1;
 707 endif
 708 else
 709 PTINC := \
 710         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 711         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 712         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 713         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 714         -I$(top_srcdir)$(PTDIR) \
 715         -I$(top_srcdir)libpthread
 716 endif
 717 CFLAGS+=$(PTINC)
 718 else
 719         PTNAME :=
 720         PTINC  :=
 721 endif
 722 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 723
 724 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 725 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 726 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 727 CFLAGS += $(CC_INC)
 728
 729 CFLAGS += -I$(KERNEL_HEADERS)
 730
 731 ifneq ($(DOASSERTS),y)
 732 CFLAGS+=-DNDEBUG
 733 endif
 734
 735 ifeq ($(SYMBOL_PREFIX),_)
 736 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 737 endif
 738
 739 # Keep the check_as from being needlessly executed
 740 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 741 $(eval $(call check-as-var,--noexecstack))
 742 endif
 743 ASFLAGS += $(ASFLAG_--noexecstack)
 744
 745 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 746 $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 747 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 748 # with -O0 we (e.g. lockf) might end up with references to
 749 # _Unwind_Resume, so pull in gcc_eh in this case..
 750 # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
 751 # in libgcc.a, so check if the printed file exist, before adding to the commandline
 752 LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
 753 LIBGCC_DIR := $(dir $(LIBGCC_A))
 754 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
 755
 756 # moved from libpthread/linuxthreads
 757 ifeq ($(UCLIBC_CTOR_DTOR),y)
 758 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 759 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 760 endif
 761
 762 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 763
 764 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"