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