1 # Rules.make for uClibc
3 # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
5 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
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 :=).
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)
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.
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.
38 # Most people will set this stuff on the command line, i.e.
39 # make CROSS=arm-linux-
40 # will build uClibc for 'arm'.
49 STRIPTOOL = $(CROSS)strip
58 STRIP_FLAGS ?= -x -R .note -R .comment
60 ## unused? if yes, remove after 0.9.31
61 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef -UUCLIBC_INTERNAL
63 # Select the compiler needed to build binaries for your development system
65 BUILD_CFLAGS = -Os -Wall
66 export ARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \
67 -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
68 -e s/arm.*/arm/ -e s/sa110/arm/ \
70 -e s/s390x/s390/ -e s/parisc.*/hppa/ \
71 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
72 -e s/xtensa.*/xtensa/ )
75 #---------------------------------------------------------
76 # Nothing beyond this point should ever be touched by mere
77 # mortals. Unless you hang out with the gods, you should
78 # probably leave all this stuff alone.
81 # Pull in the user's uClibc configuration
82 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
83 -include $(top_builddir).config
86 # Make certain these contain a final "/", but no "//"s.
87 TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_ARCH=//' -e 's/"//g')
88 TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
89 TARGET_SUBARCH:=$(shell grep -s '^TARGET_SUBARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_SUBARCH=//' -e 's/"//g')
90 TARGET_SUBARCH:=$(strip $(subst ",, $(strip $(TARGET_SUBARCH))))
91 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
92 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
93 KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_HEADERS))))))
94 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS
97 # Now config hard core
102 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
103 ifneq ($(EXTRAVERSION),)
104 VERSION := $(VERSION)$(EXTRAVERSION)
106 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
108 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
111 SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
112 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
113 UCLIBC_LDSO_NAME := ld64-uClibc
114 ARCH_NATIVE_BIT := 64
116 UCLIBC_LDSO_NAME := ld-uClibc
117 ARCH_NATIVE_BIT := 32
119 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
120 NONSHARED_LIBNAME := uclibc_nonshared.a
121 libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
122 libc.depend := $(top_builddir)lib/$(SHARED_MAJORNAME:.$(MAJOR_VERSION)=)
123 interp := $(top_builddir)lib/interp.os
124 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
125 headers_dep := $(top_builddir)include/bits/sysnum.h
126 sub_headers := $(headers_dep)
128 #LIBS :=$(interp) -L$(top_builddir)lib -lc
129 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
131 # Make sure DESTDIR and PREFIX can be used to install
132 # PREFIX is a uClibcism while DESTDIR is a common GNUism
137 ifneq ($(HAVE_SHARED),y)
147 CROSS=$(strip $(subst ",, $(CROSS_COMPILER_PREFIX)))
150 # A nifty macro to make testing gcc features easier
152 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
153 then echo "$(1)"; else echo "$(2)"; fi)
155 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
156 then echo "-Wa,$(1)"; fi)
158 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
159 then echo "$(1)"; fi)
164 # Flags in OPTIMIZATION are used only for non-debug builds
167 # Use '-Os' optimization if available, else use -O2, allow Config to override
168 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
169 # Use the gcc 3.4 -funit-at-a-time optimization when available
170 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
172 GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
173 #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
175 ifeq ($(GCC_MAJOR_VER),4)
176 # shrinks code, results are from 4.0.2
178 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
180 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
182 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
186 # CPU_CFLAGS-y contain options which are not warnings,
187 # not include or library paths, and not optimizations.
189 # Why -funsigned-char: I hunted a bug related to incorrect
190 # sign extension of 'char' type for 10 hours straight. Not fun.
191 CPU_CFLAGS-y := -funsigned-char -fno-builtin
193 CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
196 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
197 # If -msoft-float isn't supported, we want an error anyway.
198 # Hmm... might need to revisit this for arm since it has 2 different
199 # soft float encodings.
200 ifneq ($(TARGET_ARCH),nios)
201 ifneq ($(TARGET_ARCH),nios2)
202 ifneq ($(TARGET_ARCH),sh)
203 CPU_CFLAGS-y += -msoft-float
207 ifeq ($(TARGET_ARCH),arm)
208 # No longer needed with current toolchains, but leave it here for now.
209 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
210 # LDADD_LIBFLOAT=-lfloat
214 CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
216 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
217 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
219 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
220 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
223 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
224 PICFLAG := $(PICFLAG-y)
227 # Some nice CPU specific optimizations
228 ifeq ($(TARGET_ARCH),i386)
229 OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
231 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
232 # Non-SSE capable processor.
233 # NB: this may make SSE insns segfault!
234 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
235 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
236 # -m32 is needed if host is 64-bit
237 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
239 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
242 # Choice of alignment (please document why!)
243 # -falign-labels: in-line labels
244 # (reachable by normal code flow, aligning will insert nops
245 # which will be executed - may even make things slower)
246 # -falign-jumps: reachable only by a jump
247 # Generic: no alignment at all (smallest code)
248 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
249 ifeq ($(CONFIG_K7),y)
250 # Align functions to four bytes, use default for jumps and loops (why?)
251 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
253 ifeq ($(CONFIG_CRUSOE),y)
254 # Use compiler's default for functions, jumps and loops (why?)
255 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
257 ifeq ($(CONFIG_CYRIXIII),y)
258 # Use compiler's default for functions, jumps and loops (why?)
259 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
261 OPTIMIZATION+=$(GCC_FALIGN)
263 # Putting each function and data object into its own section
264 # allows for kbytes of less text if users link against static uclibc
265 # using ld --gc-sections.
266 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
267 # do not use --gc-sections at shared lib link time.
268 # However, in combination with sections being sorted by alignment
269 # it does result in much reduced padding:
270 # text data bss dec hex
271 # 235319 1472 5992 242783 3b45f old.so
272 # 234104 1472 5980 241556 3af94 new.so
273 # Without -ffunction-sections, all functions will get aligned
274 # to 4 byte boundary by as/ld. This is arguably a bug in as.
275 # It specifies 4 byte align for .text even if not told to do so:
276 # Idx Name Size VMA LMA File off Algn
277 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
278 CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
279 ifneq ($(call check_ld,--sort-common,),)
280 CPU_LDFLAGS-y += -Wl,--sort-common
282 ifneq ($(call check_ld,--sort-section alignment),)
283 CPU_LDFLAGS-y += -Wl,--sort-section,alignment
288 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
289 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
290 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
291 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
292 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
293 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
294 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
295 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
296 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
297 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
298 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
299 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
300 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
301 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
302 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
303 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
306 ifeq ($(TARGET_ARCH),sparc)
307 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
308 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
309 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
310 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
313 ifeq ($(TARGET_ARCH),arm)
314 OPTIMIZATION+=-fstrict-aliasing
315 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
316 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
317 CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
318 CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
319 CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
320 CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
321 CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
322 CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
323 CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
324 CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
325 CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
326 CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
327 CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
328 CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
329 CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
330 CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
331 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
332 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
333 CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
334 CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
335 CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
338 ifeq ($(TARGET_ARCH),mips)
339 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
340 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
341 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
342 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
343 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
344 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
345 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
346 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
347 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
348 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
350 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
351 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
352 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
354 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
355 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
356 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
359 ifeq ($(TARGET_ARCH),nios)
360 CPU_LDFLAGS-y+=-Wl,-m32
361 CPU_CFLAGS-y+=-Wl,-m32
364 ifeq ($(TARGET_ARCH),sh)
365 OPTIMIZATION+=-fstrict-aliasing
366 OPTIMIZATION+= $(call check_gcc,-mprefergot,)
367 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
368 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
369 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
370 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
371 ifeq ($(UCLIBC_HAS_FPU),y)
372 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
373 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
375 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
376 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
380 ifeq ($(TARGET_ARCH),sh64)
381 OPTIMIZATION+=-fstrict-aliasing
382 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
383 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
384 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
387 ifeq ($(TARGET_ARCH),h8300)
389 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
390 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
391 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
392 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
395 ifeq ($(TARGET_ARCH),cris)
396 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
397 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
398 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
403 ifeq ($(TARGET_ARCH),m68k)
404 # -fPIC is only supported for 68020 and above. It is not supported
405 # for 68000, 68010, or Coldfire.
410 ifeq ($(TARGET_ARCH),powerpc)
411 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
412 # enough. Therefore use -fpic which will reduce code size and generates
416 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
417 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
418 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
422 ifeq ($(TARGET_ARCH),bfin)
424 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
425 CPU_CFLAGS-y:=-mfdpic
426 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
430 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
431 PICFLAG := -mleaf-id-shared-library
435 ifeq ($(TARGET_ARCH),frv)
436 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
437 # Using -pie causes the program to have an interpreter, which is
438 # forbidden, so we must make do with -shared. Unfortunately,
439 # -shared by itself would get us global function descriptors
440 # and calls through PLTs, dynamic resolution of symbols, etc,
441 # which would break as well, but -Bsymbolic comes to the rescue.
442 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
446 ifeq ($(strip $(TARGET_ARCH)),avr32)
447 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
448 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
449 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
452 ifeq ($(TARGET_ARCH),i960)
456 ifeq ($(TARGET_ARCH),microblaze)
460 ifeq ($(TARGET_ARCH),v850)
464 # Keep the check_gcc from being needlessly executed
466 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
468 # We need to keep track of both the CC PIE flag (above) as
469 # well as the LD PIE flag (below) because we can't rely on
470 # gcc passing -pie if we used -fPIE. We need to directly use -pie
471 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
473 export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
476 # Check for --as-needed support in linker
477 ifndef LD_FLAG_ASNEEDED
478 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
479 ifneq ($(_LD_FLAG_ASNEEDED),)
480 export LD_FLAG_ASNEEDED:=--as-needed
483 ifndef LD_FLAG_NO_ASNEEDED
484 ifdef LD_FLAG_ASNEEDED
485 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
488 ifndef CC_FLAG_ASNEEDED
489 ifdef LD_FLAG_ASNEEDED
490 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
493 ifndef CC_FLAG_NO_ASNEEDED
494 ifdef LD_FLAG_NO_ASNEEDED
495 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
498 link.asneeded = $(if $(and $(CC_FLAG_ASNEEDED),$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
500 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
502 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
505 # Add a bunch of extra pedantic annoyingly strict checks
506 XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
507 ifeq ($(EXTRA_WARNINGS),y)
508 XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
509 XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
510 XWARNINGS+=-Wnonnull -Wundef
511 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
512 #XWARNINGS+=-Wdeclaration-after-statement
514 # Seems to be unused (no ARCH_CFLAGS anywhere), delete?
515 # if yes, remove after 0.9.31
516 XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
517 CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
519 SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
520 ifeq ($(UCLIBC_BUILD_SSP),y)
521 SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
522 SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
523 SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
525 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
528 NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
530 # Collect all CFLAGS components
531 CFLAGS := -include $(top_builddir)include/libc-symbols.h \
532 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
533 -nostdinc -I$(top_builddir)include -I. \
534 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
535 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
536 CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
539 # Please let us see private headers' parts
540 # Deprecated: _LIBC serves the same purpose
541 CFLAGS += -DUCLIBC_INTERNAL
543 # We need this to be checked within libc-symbols.h
544 ifneq ($(HAVE_SHARED),y)
548 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
549 -Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
550 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
551 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
553 ifeq ($(UCLIBC_BUILD_RELRO),y)
554 LDFLAGS_NOSTRIP+=-Wl,-z,relro
557 ifeq ($(UCLIBC_BUILD_NOW),y)
558 LDFLAGS_NOSTRIP+=-Wl,-z,now
561 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
562 # Be sure that binutils support it
563 LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
564 ifeq ($(LDFLAGS_GNUHASH),)
565 ifneq ($(filter-out install_headers headers-y,$(MAKECMDGOALS)),)
566 $(error Your binutils don't support --hash-style option, while you want to use it)
569 LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
573 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
577 CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
582 STRIPTOOL := true -Stripping_disabled
586 # we try to compile all sources at once into an object (IMA), but
587 # gcc-3.3.x does not support it
588 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
589 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
590 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
591 ifeq ($(GCC_MAJOR_VER),3)
594 CFLAGS+=$(call check_gcc,--combine,)
600 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
601 LDFLAGS += $(subst ",, $(UCLIBC_EXTRA_LDFLAGS))
604 ifeq ($(UCLIBC_HAS_THREADS),y)
605 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
608 ifeq ($(LINUXTHREADS_OLD),y)
609 PTNAME := linuxthreads.old
611 PTNAME := linuxthreads
614 PTDIR := $(top_builddir)libpthread/$(PTNAME)
615 # set up system dependencies include dirs (NOTE: order matters!)
616 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
618 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
619 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
620 -I$(PTDIR)/sysdeps/unix/sysv/linux \
621 -I$(PTDIR)/sysdeps/pthread \
622 -I$(PTDIR)/sysdeps/pthread/bits \
623 -I$(PTDIR)/sysdeps/generic \
624 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
625 -I$(top_srcdir)ldso/include
627 # Test for TLS if NPTL support was selected.
629 GCC_HAS_TLS=$(shell \
630 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
631 ifneq ($(GCC_HAS_TLS),)
634 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
635 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
636 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
637 @echo "#### about this problem.";
639 @echo "#### Exiting...";
645 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
646 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
647 -I$(PTDIR)/sysdeps/unix/sysv/linux \
648 -I$(PTDIR)/sysdeps/pthread \
650 -I$(top_builddir)libpthread
657 CFLAGS += -I$(KERNEL_HEADERS)
659 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
660 CC_IPREFIX := $(shell $(CC) --print-file-name=include)
661 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
664 ifneq ($(DOASSERTS),y)
668 ifeq ($(SYMBOL_PREFIX),_)
669 CFLAGS+=-D__UCLIBC_UNDERSCORES__
672 # Keep the check_as from being needlessly executed
673 ifndef ASFLAGS_NOEXEC
674 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
675 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
677 export ASFLAGS_NOEXEC :=
680 ASFLAGS = $(ASFLAGS_NOEXEC)
682 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
683 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
684 LIBGCC_DIR:=$(dir $(LIBGCC))
686 # moved from libpthread/linuxthreads
687 ifeq ($(UCLIBC_CTOR_DTOR),y)
688 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
689 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
692 LOCAL_INSTALL_PATH := install_dir