Rules.mak

   1 # Rules.mak for uClibc-ng
   2 #
   3 # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
   4 # Copyright (C) 2015-2024 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      := 48
 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 endif
 171 ifneq ($(HAVE_LDSO),y)
 172 interp :=
 173 ldso :=
 174 endif
 175
 176 comma:=,
 177 space:= #
 178
 179 ifeq ($(CROSS_COMPILE),)
 180 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 181 endif
 182
 183 # A nifty macro to make testing gcc features easier
 184 check_gcc=$(shell \
 185         tf="/tmp/cgccucl$$$$.o"; \
 186         if $(CC) $(1) -S -o $$tf -xc /dev/null > /dev/null 2>&1; \
 187         then echo "$(1)"; else echo "$(2)"; fi; rm -f $$tf )
 188 check_as=$(shell \
 189         tf="/tmp/casucl$$$$.o"; \
 190         if $(CC) -Wa,$(1) -Wa,-Z -c -o $$tf -xassembler /dev/null > /dev/null 2>&1; \
 191         then echo "-Wa,$(1)"; fi; rm -f $$tf )
 192 check_ld=$(shell \
 193         tf="/tmp/clducl$$$$.c"; echo "int _start(){return 0;}int main(){return 0;}" >$$tf; \
 194         if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null $$tf > /dev/null 2>&1; \
 195         then echo "$(1)"; fi; rm -f $$tf )
 196
 197 # Use variable indirection here so that we can have variable
 198 # names with fun chars in them like equal signs
 199 define check-tool-var
 200 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
 201 _v = $(2)_$(3)
 202 ifndef $$(_v)
 203 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
 204 export $$(_v)
 205 endif
 206 endif
 207 endef
 208
 209 # Usage: check-gcc-var,<flag>
 210 # Check the C compiler to see if it supports <flag>.
 211 # Export the variable CFLAG_<flag> if it does.
 212 define check-gcc-var
 213 $(call check-tool-var,check_gcc,CFLAG,$(1))
 214 endef
 215 # Usage: check-as-var,<flag>
 216 # Check the assembler to see if it supports <flag>.  Export the
 217 # variable ASFLAG_<flag> if it does (for invoking the assembler),
 218 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
 219 define check-as-var
 220 $(call check-tool-var,check_as,ASFLAG,$(1))
 221 _v = CFLAG_-Wa$(1)
 222 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
 223 endef
 224 # Usage: check-ld-var,<flag>
 225 # Check the linker to see if it supports <flag>.  Export the
 226 # variable LDFLAG_<flag> if it does (for invoking the linker),
 227 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
 228 define check-ld-var
 229 $(call check-tool-var,check_ld,LDFLAG,$(1))
 230 _v = CFLAG_-Wl$(1)
 231 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
 232 endef
 233 # Usage: cache-output-var,<variable>,<shell command>
 234 # Execute <shell command> and cache the output in <variable>.
 235 define cache-output-var
 236 ifndef $(1)
 237 $(1) := $$(shell $(2))
 238 export $(1)
 239 endif
 240 endef
 241
 242
 243 ARFLAGS:=cr
 244
 245 # Note: The check for -nostdlib has to be before all calls to check_ld
 246 $(eval $(call check-gcc-var,-nostdlib))
 247 $(eval $(call check-gcc-var,-nostartfiles))
 248 # deliberately not named CFLAG-fuse-ld since unchecked and from user
 249 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
 250 # failed to merge target specific data of file /dev/null
 251 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
 252 $(eval $(call check-ld-var,--no-warn-mismatch))
 253
 254 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
 255 GCC_VER := $(subst ., ,$(GCC_VER))
 256 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
 257 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
 258
 259 # Flags in OPTIMIZATION are used only for non-debug builds
 260
 261 OPTIMIZATION:=
 262 OPTIMIZATION-$(GCC_MAJOR_VER):=
 263 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
 264
 265 # Use '-Os' optimization if available, else use -O2, allow Config to override
 266 $(eval $(call check-gcc-var,-Os))
 267 ifneq ($(CFLAG_-Os),)
 268 OPTIMIZATION += $(CFLAG_-Os)
 269 else
 270 $(eval $(call check-gcc-var,-O2))
 271 OPTIMIZATION += $(CFLAG_-O2)
 272 endif
 273 # Use the gcc 3.4 -funit-at-a-time optimization when available
 274 $(eval $(call check-gcc-var,-funit-at-a-time))
 275 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
 276 $(eval $(call check-gcc-var,-fstrict-aliasing))
 277 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
 278
 279 # CPU_CFLAGS-y contain options which are not warnings,
 280 # not include or library paths, and not optimizations.
 281
 282 # Why -funsigned-char: I hunted a bug related to incorrect
 283 # sign extension of 'char' type for 10 hours straight. Not fun.
 284 CPU_CFLAGS-y := -funsigned-char -fno-builtin -fcommon
 285
 286 $(eval $(call check-gcc-var,-fno-asm))
 287 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
 288 $(eval $(call check-gcc-var,-fmerge-all-constants))
 289 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
 290
 291 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 292 ifneq ($(TARGET_ARCH),bfin)
 293 ifneq ($(TARGET_ARCH),lm32)
 294 ifneq ($(TARGET_ARCH),nios2)
 295 ifneq ($(TARGET_ARCH),nds32)
 296 ifneq ($(TARGET_ARCH),sh)
 297 ifneq ($(TARGET_ARCH),c6x)
 298 ifneq ($(TARGET_ARCH),h8300)
 299 ifneq ($(TARGET_ARCH),arc)
 300 ifneq ($(TARGET_ARCH),aarch64)
 301 ifneq ($(TARGET_ARCH),riscv32)
 302 CPU_CFLAGS-y += -msoft-float
 303 endif
 304 endif
 305 endif
 306 endif
 307 endif
 308 endif
 309 endif
 310 endif
 311 endif
 312 endif
 313 endif
 314
 315 ifeq ($(TARGET_ARCH),aarch64)
 316 CPU_CFLAGS-y += -ftls-model=initial-exec
 317 endif
 318
 319 $(eval $(call check-gcc-var,-std=gnu99))
 320 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
 321
 322 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
 323 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
 324
 325 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
 326 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB
 327
 328 PICFLAG-y := -fPIC
 329 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
 330 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
 331 PICFLAG := $(PICFLAG-y)
 332 PIEFLAG_NAME:=-fPIE
 333
 334 $(eval $(call check-gcc-var,-fdata-sections))
 335 $(eval $(call check-gcc-var,-ffunction-sections))
 336
 337 # Some nice CPU specific optimizations
 338 ifeq ($(TARGET_ARCH),i386)
 339
 340 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
 341         # TODO: Change this to a gcc version check.  This bug
 342         # should be fixed with at least gcc-4.3.
 343         # Non-SSE capable processor.
 344         # NB: this may make SSE insns segfault!
 345         # -O1 -march=pentium3, -Os -msse etc are known to be affected.
 346         # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
 347         # -m32 is needed if host is 64-bit
 348         OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 349 else
 350 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
 351         OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
 352 endif
 353
 354         # Choice of alignment (please document why!)
 355         #  -falign-labels: in-line labels
 356         #  (reachable by normal code flow, aligning will insert nops
 357         #  which will be executed - may even make things slower)
 358         #  -falign-jumps: reachable only by a jump
 359         # Generic: no alignment at all (smallest code)
 360         GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
 361         OPTIMIZATION+=$(GCC_FALIGN)
 362
 363         # Putting each function and data object into its own section
 364         # allows for kbytes of less text if users link against static uclibc
 365         # using ld --gc-sections.
 366         # ld 2.18 can't do that (yet?) for shared libraries, so we itself
 367         # do not use --gc-sections at shared lib link time.
 368         # However, in combination with sections being sorted by alignment
 369         # it does result in much reduced padding:
 370         #   text    data     bss     dec     hex
 371         # 235319    1472    5992  242783   3b45f old.so
 372         # 234104    1472    5980  241556   3af94 new.so
 373         # Without -ffunction-sections, all functions will get aligned
 374         # to 4 byte boundary by as/ld. This is arguably a bug in as.
 375         # It specifies 4 byte align for .text even if not told to do so:
 376         # Idx Name          Size      VMA       LMA       File off  Algn
 377         #   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 378         CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
 379         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
 380 $(eval $(call check-ld-var,--sort-section=alignment))
 381         CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
 382
 383         CPU_LDFLAGS-y+=-m32
 384         CPU_CFLAGS-y+=-m32
 385 endif
 386
 387 ifeq ($(TARGET_ARCH),sparc)
 388         CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
 389         CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
 390         CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
 391         CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
 392 endif
 393
 394 ifeq ($(TARGET_ARCH),arm)
 395         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 396         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 397 endif
 398
 399 ifeq ($(TARGET_ARCH),metag)
 400         SYMBOL_PREFIX=_
 401         CPU_CFLAGS-$(CONFIG_META_1_2)+=
 402         CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
 403 endif
 404
 405 ifeq ($(TARGET_ARCH),mips)
 406         OPTIMIZATION+=-mno-split-addresses
 407         CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 408         CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 409         CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
 410         CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
 411         CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
 412         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 413 endif
 414
 415 ifeq ($(TARGET_ARCH),nds32)
 416         CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
 417         CFLAGS-.os+= -DPIC
 418         CFLAGS-.oS+= -DPIC
 419 endif
 420
 421 ifeq ($(TARGET_ARCH),sh)
 422 $(eval $(call check-gcc-var,-mprefergot))
 423         OPTIMIZATION += $(CFLAG_-mprefergot)
 424         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
 425         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
 426         CPU_CFLAGS-$(CONFIG_SH2)+=-m2
 427         CPU_CFLAGS-$(CONFIG_SH3)+=-m3
 428 ifeq ($(UCLIBC_HAS_FPU),y)
 429         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
 430         CPU_CFLAGS-$(CONFIG_SH4)+=-m4
 431         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
 432 else
 433         CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
 434         CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
 435         CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
 436 endif
 437 endif
 438
 439 ifeq ($(TARGET_ARCH),h8300)
 440         CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
 441         CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
 442 endif
 443
 444 ifeq ($(TARGET_ARCH),cris)
 445         CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
 446         CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
 447         CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
 448         PICFLAG:=-fpic
 449         PIEFLAG_NAME:=-fpie
 450 endif
 451
 452 ifeq ($(TARGET_ARCH),csky)
 453         # In csky gas implement, we use $t and $d to detect .text or literal pool.
 454         # So we couldn't strip them for objdump.
 455         STRIP_FLAGS += -K "$$"t -K "$$"d
 456
 457         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)        += -mlittle-endian
 458         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)           += -mbig-endian
 459 endif
 460
 461 ifeq ($(TARGET_ARCH),kvx)
 462         CPU_CFLAGS-y += -march=$(call qstrip,$(TARGET_MARCH))
 463         CPU_LDFLAGS-y += -march=$(call qstrip,$(TARGET_MARCH))
 464 endif
 465
 466 ifeq ($(TARGET_ARCH),m68k)
 467         # -fPIC is only supported for 68020 and above.  It is not supported
 468         # for 68000, 68010, or Coldfire.
 469         PICFLAG:=-fpic
 470         PIEFLAG_NAME:=-fpie
 471 endif
 472
 473 ifeq ($(TARGET_ARCH),powerpc)
 474 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
 475 # enough. Therefore use -fpic which will reduce code size and generates
 476 # faster code.
 477         PICFLAG:=-fpic
 478         PIEFLAG_NAME:=-fpie
 479         PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
 480         PPC_HAS_SECUREPLT:=$(shell $(CC) --verbose 2>&1 | grep -- --enable-secureplt > /dev/null && echo -n y || echo -n n)
 481         CPU_CFLAGS-$(PPC_HAS_SECUREPLT) += -DPPC_HAS_SECUREPLT
 482         CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
 483         CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
 484 endif
 485
 486 ifeq ($(TARGET_ARCH),bfin)
 487         SYMBOL_PREFIX=_
 488 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
 489         CPU_CFLAGS-y:=-mfdpic
 490         CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 491         PICFLAG:=-fpic
 492         PIEFLAG_NAME:=-fpie
 493 endif
 494 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
 495         PICFLAG := -mleaf-id-shared-library
 496 endif
 497 endif
 498
 499 ifeq ($(TARGET_ARCH),frv)
 500         # Using -pie causes the program to have an interpreter, which is
 501         # forbidden, so we must make do with -shared.  Unfortunately,
 502         # -shared by itself would get us global function descriptors
 503         # and calls through PLTs, dynamic resolution of symbols, etc,
 504         # which would break as well, but -Bsymbolic comes to the rescue.
 505         CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
 506 endif
 507
 508 ifeq ($(strip $(TARGET_ARCH)),avr32)
 509        CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
 510        CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
 511        CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
 512 endif
 513
 514 ifeq ($(TARGET_ARCH),c6x)
 515         PIEFLAG:=
 516         CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
 517         CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
 518         CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
 519         CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
 520         CPU_LDFLAGS-y += $(CPU_CFLAGS)
 521 endif
 522
 523 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
 524 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
 525 ifeq ($(PIEFLAG),)
 526 PIEFLAG := $(PICFLAG)
 527 endif
 528 # We need to keep track of both the CC PIE flag (above) as
 529 # well as the LD PIE flag (below) because we can't rely on
 530 # gcc passing -pie if we used -fPIE. We need to directly use -pie
 531 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
 532 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
 533
 534 # Check for --as-needed support in linker
 535 ifndef LD_FLAG_ASNEEDED
 536 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
 537 ifneq ($(_LD_FLAG_ASNEEDED),)
 538 export LD_FLAG_ASNEEDED:=--as-needed
 539 endif
 540 endif
 541 ifndef LD_FLAG_NO_ASNEEDED
 542 ifdef LD_FLAG_ASNEEDED
 543 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
 544 endif
 545 endif
 546 ifndef CC_FLAG_ASNEEDED
 547 ifdef LD_FLAG_ASNEEDED
 548 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
 549 endif
 550 endif
 551 ifndef CC_FLAG_NO_ASNEEDED
 552 ifdef LD_FLAG_NO_ASNEEDED
 553 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
 554 endif
 555 endif
 556 link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
 557
 558 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
 559 ifndef ASNEEDED
 560 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
 561 endif
 562
 563 # Add a bunch of extra pedantic annoyingly strict checks
 564 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing -Wno-nonnull-compare
 565 ifeq ($(EXTRA_WARNINGS),y)
 566 WARNING_FLAGS += \
 567         -Wnonnull-compare \
 568         -Wnodeclaration-after-statement \
 569         -Wformat=2 \
 570         -Wmissing-noreturn \
 571         -Wmissing-format-attribute \
 572         -Wmissing-prototypes \
 573         -Wmissing-declarations \
 574         -Wnested-externs \
 575         -Wnonnull \
 576         -Wold-style-declaration \
 577         -Wold-style-definition \
 578         -Wshadow \
 579         -Wundef
 580 endif
 581 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
 582 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
 583 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
 584
 585 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
 586
 587 # Save the tested flag in a single variable and force it to be
 588 # evaluated just once.  Then use that computed value.
 589 $(eval $(call check-gcc-var,-fno-stack-protector))
 590 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
 591 ifeq ($(UCLIBC_BUILD_SSP),y)
 592 $(eval $(call check-gcc-var,-fno-stack-protector-all))
 593 $(eval $(call check-gcc-var,-fstack-protector))
 594 $(eval $(call check-gcc-var,-fstack-protector-all))
 595 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
 596 SSP_CFLAGS += $(CFLAG_-fstack-protector)
 597 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
 598 else
 599 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
 600 endif
 601
 602 # Collect all CFLAGS components
 603 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 604         -nostdinc -I$(top_builddir)include \
 605         -I$(top_srcdir)include -include libc-symbols.h \
 606         -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
 607         -I$(top_builddir)libc/sysdeps/linux/$(TARGET_ARCH) \
 608         -I$(top_srcdir)libc/sysdeps/linux \
 609         -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
 610         -I$(top_srcdir)ldso/include -I.
 611
 612 # We need this to be checked within libc-symbols.h
 613 ifneq ($(HAVE_SHARED),y)
 614 CFLAGS += -DSTATIC
 615 endif
 616
 617 $(eval $(call check-ld-var,--warn-once))
 618 $(eval $(call check-ld-var,--sort-common))
 619 $(eval $(call check-ld-var,--discard-all))
 620 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
 621         -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
 622
 623 ifeq ($(UCLIBC_BUILD_RELRO),y)
 624 LDFLAGS_NOSTRIP+=-Wl,-z,relro
 625 endif
 626
 627 ifeq ($(UCLIBC_BUILD_NOW),y)
 628 LDFLAGS_NOSTRIP+=-Wl,-z,now
 629 endif
 630
 631 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 632 # Be sure that binutils support it
 633 $(eval $(call check-ld-var,--hash-style=gnu))
 634 ifeq ($(LDFLAG_--hash-style=gnu),)
 635 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
 636 $(error Your binutils do not support --hash-style option, while you want to use it)
 637 endif
 638 else
 639 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
 640 endif
 641 endif
 642
 643 ifeq ($(DODEBUG),y)
 644 CFLAGS += -O0 -g3 -DDEBUG
 645 else
 646 CFLAGS += $(OPTIMIZATION)
 647 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
 648 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
 649 $(eval $(call check-ld-var,-O2))
 650 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
 651 endif
 652
 653 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
 654
 655 ifeq ($(DOSTRIP),y)
 656 LDFLAGS += -Wl,-s
 657 else
 658 STRIPTOOL := true -Stripping_disabled
 659 endif
 660
 661 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 662 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
 663 endif
 664 ifeq ($(TARGET_ARCH),i386)
 665 CFLAGS += -fno-omit-frame-pointer
 666 endif
 667 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
 668 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
 669 endif
 670
 671 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 672 CFLAGS += -D__USE_STDIO_FUTEXES__
 673 endif
 674
 675 ifeq ($(UCLIBC_USE_TIME64),y)
 676 CFLAGS += -D__UCLIBC_HAVE_STATX__
 677 endif
 678
 679 ifeq ($(UCLIBC_HAS_THREADS),y)
 680 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 681         PTNAME := nptl
 682         CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
 683 else
 684 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
 685         PTNAME := linuxthreads
 686 endif
 687 endif
 688 PTDIR := libpthread/$(PTNAME)
 689 # set up system dependencies include dirs (NOTE: order matters!)
 690 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 691 PTINC:= -I$(top_builddir)$(PTDIR)                                       \
 692         -I$(top_srcdir)$(PTDIR)                                         \
 693         $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
 694         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)  \
 695         -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                \
 696         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)                  \
 697         -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux               \
 698         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux                 \
 699         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread                         \
 700         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits                    \
 701         -I$(top_srcdir)$(PTDIR)/sysdeps/generic
 702 #
 703 # Test for TLS if NPTL support was selected.
 704 #
 705 GCC_HAS_TLS=$(shell \
 706         echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
 707 ifneq ($(GCC_HAS_TLS),)
 708 gcc_tls_test_fail:
 709         @echo "####";
 710         @echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
 711         @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
 712         @echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
 713         @echo "#### about this problem.";
 714         @echo "####";
 715         @echo "#### Exiting...";
 716         @echo "####";
 717         @exit 1;
 718 endif
 719 else
 720 PTINC := \
 721         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
 722         -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
 723         -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
 724         -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
 725         -I$(top_srcdir)$(PTDIR) \
 726         -I$(top_srcdir)libpthread
 727 endif
 728 CFLAGS+=$(PTINC)
 729 else
 730         PTNAME :=
 731         PTINC  :=
 732 endif
 733 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
 734
 735 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
 736 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
 737 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
 738 CFLAGS += $(CC_INC)
 739
 740 CFLAGS += -I$(KERNEL_HEADERS)
 741
 742 ifneq ($(DOASSERTS),y)
 743 CFLAGS+=-DNDEBUG
 744 endif
 745
 746 ifeq ($(SYMBOL_PREFIX),_)
 747 CFLAGS+=-D__UCLIBC_UNDERSCORES__
 748 endif
 749
 750 # Keep the check_as from being needlessly executed
 751 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
 752 $(eval $(call check-as-var,--noexecstack))
 753 endif
 754 ASFLAGS += $(ASFLAG_--noexecstack)
 755
 756 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
 757 $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
 758 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
 759 # with -O0 we (e.g. lockf) might end up with references to
 760 # _Unwind_Resume, so pull in gcc_eh in this case..
 761 # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
 762 # in libgcc.a, so check if the printed file exist, before adding to the commandline
 763 LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
 764 LIBGCC_DIR := $(dir $(LIBGCC_A))
 765 LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
 766
 767 # moved from libpthread/linuxthreads
 768 ifeq ($(UCLIBC_CTOR_DTOR),y)
 769 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
 770 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
 771 endif
 772
 773 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
 774
 775 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"