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 OBJDUMP = $(CROSS)objdump
50 STRIPTOOL = $(CROSS)strip
59 STRIP_FLAGS ?= -x -R .note -R .comment
61 ## unused? if yes, remove after 0.9.31
62 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
64 # Select the compiler needed to build binaries for your development system
66 BUILD_CFLAGS = -Os -Wall
68 #---------------------------------------------------------
69 # Nothing beyond this point should ever be touched by mere
70 # mortals. Unless you hang out with the gods, you should
71 # probably leave all this stuff alone.
74 qstrip = $(strip $(subst ",,$(1)))
77 # Pull in the user's uClibc configuration
78 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
79 -include $(top_builddir).config
81 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
82 ifeq ($(TARGET_ARCH),)
83 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
84 -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
85 -e s/arm.*/arm/ -e s/sa110/arm/ \
87 -e s/s390x/s390/ -e s/parisc.*/hppa/ \
88 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
89 -e s/xtensa.*/xtensa/ )
95 # Make certain these contain a final "/", but no "//"s.
96 TARGET_SUBARCH:=$(call qstrip,$(shell grep -s '^TARGET_SUBARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_SUBARCH=//'))
97 TARGET_SUBARCH:=$(call qstrip,$(TARGET_SUBARCH))
98 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(RUNTIME_PREFIX)))))
99 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(DEVEL_PREFIX)))))
100 MULTILIB_DIR:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(MULTILIB_DIR)))))
101 KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(KERNEL_HEADERS)))))
102 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
105 # Now config hard core
109 EXTRAVERSION :=-rc1-git
110 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
111 ifneq ($(EXTRAVERSION),)
112 VERSION := $(VERSION)$(EXTRAVERSION)
114 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
116 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
119 SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
120 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
121 UCLIBC_LDSO_NAME := ld64-uClibc
122 ARCH_NATIVE_BIT := 64
124 UCLIBC_LDSO_NAME := ld-uClibc
125 ARCH_NATIVE_BIT := 32
127 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
128 NONSHARED_LIBNAME := uclibc_nonshared.a
129 libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
130 libc.depend := $(top_builddir)lib/$(SHARED_MAJORNAME:.$(MAJOR_VERSION)=)
131 interp := $(top_builddir)lib/interp.os
132 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
133 headers_dep := $(top_builddir)include/bits/sysnum.h
134 sub_headers := $(headers_dep)
136 #LIBS :=$(interp) -L$(top_builddir)lib -lc
137 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
139 # Make sure DESTDIR and PREFIX can be used to install
140 # PREFIX is a uClibcism while DESTDIR is a common GNUism
145 ifneq ($(HAVE_SHARED),y)
155 CROSS=$(call qstrip,$(CROSS_COMPILER_PREFIX))
158 # A nifty macro to make testing gcc features easier
160 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
161 then echo "$(1)"; else echo "$(2)"; fi)
163 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
164 then echo "-Wa,$(1)"; fi)
166 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
167 then echo "$(1)"; fi)
172 # Flags in OPTIMIZATION are used only for non-debug builds
175 # Use '-Os' optimization if available, else use -O2, allow Config to override
176 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
177 # Use the gcc 3.4 -funit-at-a-time optimization when available
178 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
179 # shrinks code by about 0.1%
180 OPTIMIZATION+=$(call check_gcc,-fmerge-all-constants)
182 GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
183 #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
185 ifeq ($(GCC_MAJOR_VER),4)
186 # shrinks code, results are from 4.0.2
188 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
190 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
192 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
196 # CPU_CFLAGS-y contain options which are not warnings,
197 # not include or library paths, and not optimizations.
199 # Why -funsigned-char: I hunted a bug related to incorrect
200 # sign extension of 'char' type for 10 hours straight. Not fun.
201 CPU_CFLAGS-y := -funsigned-char -fno-builtin
203 CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
206 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
207 # If -msoft-float isn't supported, we want an error anyway.
208 # Hmm... might need to revisit this for arm since it has 2 different
209 # soft float encodings.
210 ifneq ($(TARGET_ARCH),nios)
211 ifneq ($(TARGET_ARCH),nios2)
212 ifneq ($(TARGET_ARCH),sh)
213 CPU_CFLAGS-y += -msoft-float
217 ifeq ($(TARGET_ARCH),arm)
218 # No longer needed with current toolchains, but leave it here for now.
219 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
220 # LDADD_LIBFLOAT=-lfloat
224 CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
226 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
227 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
229 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
230 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
233 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
234 PICFLAG := $(PICFLAG-y)
237 # Some nice CPU specific optimizations
238 ifeq ($(TARGET_ARCH),i386)
239 OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
241 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
242 # Non-SSE capable processor.
243 # NB: this may make SSE insns segfault!
244 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
245 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
246 # -m32 is needed if host is 64-bit
247 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
249 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
252 # Choice of alignment (please document why!)
253 # -falign-labels: in-line labels
254 # (reachable by normal code flow, aligning will insert nops
255 # which will be executed - may even make things slower)
256 # -falign-jumps: reachable only by a jump
257 # Generic: no alignment at all (smallest code)
258 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
259 ifeq ($(CONFIG_K7),y)
260 # Align functions to four bytes, use default for jumps and loops (why?)
261 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
263 ifeq ($(CONFIG_CRUSOE),y)
264 # Use compiler's default for functions, jumps and loops (why?)
265 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
267 ifeq ($(CONFIG_CYRIXIII),y)
268 # Use compiler's default for functions, jumps and loops (why?)
269 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
271 OPTIMIZATION+=$(GCC_FALIGN)
273 # Putting each function and data object into its own section
274 # allows for kbytes of less text if users link against static uclibc
275 # using ld --gc-sections.
276 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
277 # do not use --gc-sections at shared lib link time.
278 # However, in combination with sections being sorted by alignment
279 # it does result in much reduced padding:
280 # text data bss dec hex
281 # 235319 1472 5992 242783 3b45f old.so
282 # 234104 1472 5980 241556 3af94 new.so
283 # Without -ffunction-sections, all functions will get aligned
284 # to 4 byte boundary by as/ld. This is arguably a bug in as.
285 # It specifies 4 byte align for .text even if not told to do so:
286 # Idx Name Size VMA LMA File off Algn
287 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
288 CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
289 ifneq ($(call check_ld,--sort-common),)
290 CPU_LDFLAGS-y += -Wl,--sort-common
292 ifneq ($(call check_ld,--sort-section alignment),)
293 CPU_LDFLAGS-y += -Wl,--sort-section,alignment
298 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
299 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
300 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
301 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
302 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
303 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
304 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
305 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
306 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
307 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
308 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
309 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
310 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
311 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
312 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
313 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
316 ifeq ($(TARGET_ARCH),sparc)
317 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
318 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
319 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
320 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
323 ifeq ($(TARGET_ARCH),arm)
324 OPTIMIZATION+=-fstrict-aliasing
325 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
326 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
327 CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
328 CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
329 CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
330 CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
331 CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
332 CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
333 CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
334 CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
335 CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
336 CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
337 CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
338 CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
339 CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
340 CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
341 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
342 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
343 CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
344 CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
345 CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
348 ifeq ($(TARGET_ARCH),mips)
349 OPTIMIZATIONS+=-mno-split-addresses
350 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
351 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
352 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
353 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
354 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
355 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
356 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
357 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
358 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
359 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
361 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
362 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
363 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
365 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
366 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
367 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
370 ifeq ($(TARGET_ARCH),nios)
371 OPTIMIZATIONS+=-funaligned-struct-hack
372 CPU_LDFLAGS-y+=-Wl,-m32
373 CPU_CFLAGS-y+=-Wl,-m32
376 ifeq ($(TARGET_ARCH),sh)
377 OPTIMIZATION+=-fstrict-aliasing
378 OPTIMIZATION+= $(call check_gcc,-mprefergot,)
379 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
380 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
381 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
382 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
383 ifeq ($(UCLIBC_HAS_FPU),y)
384 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
385 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
387 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
388 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
392 ifeq ($(TARGET_ARCH),sh64)
393 OPTIMIZATION+=-fstrict-aliasing
394 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
395 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
396 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
399 ifeq ($(TARGET_ARCH),h8300)
401 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
402 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
403 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
404 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
407 ifeq ($(TARGET_ARCH),i960)
408 OPTIMIZATIONS+=-mh -mint32 #-fsigned-char
411 ifeq ($(TARGET_ARCH),e1)
412 OPTIMIZATIONS+=-mgnu-param
415 ifeq ($(TARGET_ARCH),cris)
416 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
417 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
418 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
423 ifeq ($(TARGET_ARCH),m68k)
424 # -fPIC is only supported for 68020 and above. It is not supported
425 # for 68000, 68010, or Coldfire.
430 ifeq ($(TARGET_ARCH),powerpc)
431 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
432 # enough. Therefore use -fpic which will reduce code size and generates
436 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
437 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
438 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
442 ifeq ($(TARGET_ARCH),bfin)
444 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
445 CPU_CFLAGS-y:=-mfdpic
446 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
450 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
451 PICFLAG := -mleaf-id-shared-library
455 ifeq ($(TARGET_ARCH),frv)
456 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
457 # Using -pie causes the program to have an interpreter, which is
458 # forbidden, so we must make do with -shared. Unfortunately,
459 # -shared by itself would get us global function descriptors
460 # and calls through PLTs, dynamic resolution of symbols, etc,
461 # which would break as well, but -Bsymbolic comes to the rescue.
462 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
466 ifeq ($(strip $(TARGET_ARCH)),avr32)
467 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
468 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
469 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
472 ifeq ($(TARGET_ARCH),i960)
476 ifeq ($(TARGET_ARCH),microblaze)
480 ifeq ($(TARGET_ARCH),v850)
484 # Keep the check_gcc from being needlessly executed
486 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
488 # We need to keep track of both the CC PIE flag (above) as
489 # well as the LD PIE flag (below) because we can't rely on
490 # gcc passing -pie if we used -fPIE. We need to directly use -pie
491 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
493 export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
496 # Check for --as-needed support in linker
497 ifndef LD_FLAG_ASNEEDED
498 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
499 ifneq ($(_LD_FLAG_ASNEEDED),)
500 export LD_FLAG_ASNEEDED:=--as-needed
503 ifndef LD_FLAG_NO_ASNEEDED
504 ifdef LD_FLAG_ASNEEDED
505 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
508 ifndef CC_FLAG_ASNEEDED
509 ifdef LD_FLAG_ASNEEDED
510 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
513 ifndef CC_FLAG_NO_ASNEEDED
514 ifdef LD_FLAG_NO_ASNEEDED
515 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
518 link.asneeded = $(if $(and $(CC_FLAG_ASNEEDED),$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
520 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
522 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
525 # Add a bunch of extra pedantic annoyingly strict checks
526 XWARNINGS=$(call qstrip,$(WARNINGS)) -Wstrict-prototypes -fno-strict-aliasing
527 ifeq ($(EXTRA_WARNINGS),y)
528 XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
529 XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
530 XWARNINGS+=-Wnonnull -Wundef
531 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
532 #XWARNINGS+=-Wdeclaration-after-statement
534 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
536 SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
537 ifeq ($(UCLIBC_BUILD_SSP),y)
538 SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
539 SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
540 SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
542 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
545 NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
547 # Collect all CFLAGS components
548 CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
549 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
550 -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
551 -I$(top_srcdir)libc/sysdeps/linux \
552 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
553 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
554 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
557 # We need this to be checked within libc-symbols.h
558 ifneq ($(HAVE_SHARED),y)
562 LDFLAG_WARN_ONCE:=$(if $(call check_ld,--warn-once),-Wl$(comma)--warn-once)
563 LDFLAG_SORT_COMMON:=$(if $(call check_ld,--sort-common),-Wl$(comma)--sort-common)
564 LDFLAG_DISCARD_ALL:=$(if $(call check_ld,--discard-all),-Wl$(comma)--discard-all)
565 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
566 -Wl,--warn-common $(LDFLAG_WARN_ONCE) -Wl,-z,combreloc
567 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
568 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
570 ifeq ($(UCLIBC_BUILD_RELRO),y)
571 LDFLAGS_NOSTRIP+=-Wl,-z,relro
574 ifeq ($(UCLIBC_BUILD_NOW),y)
575 LDFLAGS_NOSTRIP+=-Wl,-z,now
578 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
579 # Be sure that binutils support it
580 LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
581 ifeq ($(LDFLAGS_GNUHASH),)
582 ifneq ($(filter-out install_headers headers-y,$(MAKECMDGOALS)),)
583 $(error Your binutils do not support --hash-style option, while you want to use it)
586 LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
590 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
594 CFLAGS += $(OPTIMIZATION)
599 STRIPTOOL := true -Stripping_disabled
603 # we try to compile all sources at once into an object (IMA), but
604 # gcc-3.3.x does not support it
605 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
606 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
607 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
608 ifeq ($(GCC_MAJOR_VER),3)
611 CFLAGS+=$(call check_gcc,--combine,)
617 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
618 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
621 ifeq ($(UCLIBC_HAS_THREADS),y)
622 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
625 ifeq ($(LINUXTHREADS_OLD),y)
626 PTNAME := linuxthreads.old
628 PTNAME := linuxthreads
631 PTDIR := libpthread/$(PTNAME)
632 # set up system dependencies include dirs (NOTE: order matters!)
633 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
634 PTINC:= -I$(top_srcdir)$(PTDIR) \
635 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
636 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
637 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
638 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
639 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
640 -I$(top_srcdir)$(PTDIR)/sysdeps/generic \
641 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
642 -I$(top_srcdir)ldso/include
644 # Test for TLS if NPTL support was selected.
646 GCC_HAS_TLS=$(shell \
647 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
648 ifneq ($(GCC_HAS_TLS),)
651 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
652 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
653 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
654 @echo "#### about this problem.";
656 @echo "#### Exiting...";
662 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
663 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
664 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
665 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
666 -I$(top_srcdir)$(PTDIR) \
667 -I$(top_srcdir)libpthread
674 CFLAGS += -I$(KERNEL_HEADERS)
676 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
677 CC_IPREFIX := $(shell $(CC) --print-file-name=include)
678 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
681 ifneq ($(DOASSERTS),y)
685 ifeq ($(SYMBOL_PREFIX),_)
686 CFLAGS+=-D__UCLIBC_UNDERSCORES__
689 # Keep the check_as from being needlessly executed
690 ifndef ASFLAGS_NOEXEC
691 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
692 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
694 export ASFLAGS_NOEXEC :=
697 ASFLAGS = $(ASFLAGS_NOEXEC)
699 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
700 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
701 LIBGCC_DIR:=$(dir $(LIBGCC))
703 # moved from libpthread/linuxthreads
704 ifeq ($(UCLIBC_CTOR_DTOR),y)
705 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
706 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
709 LOCAL_INSTALL_PATH := install_dir