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_COMPILE' 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_COMPILE=arm-linux-
40 # will build uClibc for 'arm'.
41 # CROSS is still supported for backward compatibily only
43 CROSS_COMPILE ?= $(CROSS)
45 CC = $(CROSS_COMPILE)gcc
46 AR = $(CROSS_COMPILE)ar
47 LD = $(CROSS_COMPILE)ld
48 NM = $(CROSS_COMPILE)nm
49 OBJDUMP = $(CROSS_COMPILE)objdump
50 STRIPTOOL = $(CROSS_COMPILE)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,$(TARGET_SUBARCH))
97 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(RUNTIME_PREFIX)))))
98 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(DEVEL_PREFIX)))))
99 MULTILIB_DIR:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(MULTILIB_DIR)))))
100 KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(KERNEL_HEADERS)))))
101 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
104 # Now config hard core
108 EXTRAVERSION :=-rc1-git
109 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
110 ABI_VERSION := $(MAJOR_VERSION)
111 ifneq ($(EXTRAVERSION),)
112 VERSION := $(VERSION)$(EXTRAVERSION)
114 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
116 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
119 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
120 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
121 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
122 UCLIBC_LDSO_NAME := ld64-uClibc
123 ARCH_NATIVE_BIT := 64
125 UCLIBC_LDSO_NAME := ld-uClibc
126 ARCH_NATIVE_BIT := 32
128 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
129 NONSHARED_LIBNAME := uclibc_nonshared.a
130 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
131 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
132 ifneq ($(ARCH_HAS_NO_SHARED),y)
133 libdl.depend := $(top_builddir)lib/libdl.so
135 ifneq ($(HAS_NO_THREADS),y)
136 libpthread.depend := $(top_builddir)lib/libpthread.so
138 interp := $(top_builddir)lib/interp.os
139 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
140 headers_dep := $(top_builddir)include/bits/sysnum.h
141 sub_headers := $(headers_dep)
143 #LIBS :=$(interp) -L$(top_builddir)lib -lc
144 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
146 # Make sure DESTDIR and PREFIX can be used to install
147 # PREFIX is a uClibcism while DESTDIR is a common GNUism
152 ifneq ($(HAVE_SHARED),y)
162 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
165 # A nifty macro to make testing gcc features easier
167 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
168 then echo "$(1)"; else echo "$(2)"; fi)
170 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
171 then echo "-Wa,$(1)"; fi)
173 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
174 then echo "$(1)"; fi)
179 # Flags in OPTIMIZATION are used only for non-debug builds
182 # Use '-Os' optimization if available, else use -O2, allow Config to override
183 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
184 # Use the gcc 3.4 -funit-at-a-time optimization when available
185 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
186 # shrinks code by about 0.1%
187 OPTIMIZATION+=$(call check_gcc,-fmerge-all-constants)
188 OPTIMIZATION+=$(call check_gcc,-fstrict-aliasing)
190 GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
191 #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
193 ifeq ($(GCC_MAJOR_VER),4)
194 # shrinks code, results are from 4.0.2
196 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
198 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
200 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
204 # CPU_CFLAGS-y contain options which are not warnings,
205 # not include or library paths, and not optimizations.
207 # Why -funsigned-char: I hunted a bug related to incorrect
208 # sign extension of 'char' type for 10 hours straight. Not fun.
209 CPU_CFLAGS-y := -funsigned-char -fno-builtin
211 CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
214 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
215 # If -msoft-float isn't supported, we want an error anyway.
216 # Hmm... might need to revisit this for arm since it has 2 different
217 # soft float encodings.
218 ifneq ($(TARGET_ARCH),nios)
219 ifneq ($(TARGET_ARCH),nios2)
220 ifneq ($(TARGET_ARCH),sh)
221 ifneq ($(TARGET_ARCH),c6x)
222 CPU_CFLAGS-y += -msoft-float
227 ifeq ($(TARGET_ARCH),arm)
228 # No longer needed with current toolchains, but leave it here for now.
229 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
230 # LDADD_LIBFLOAT=-lfloat
234 CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
236 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
237 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
239 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
240 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
243 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
244 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
245 PICFLAG := $(PICFLAG-y)
248 # Some nice CPU specific optimizations
249 ifeq ($(TARGET_ARCH),i386)
250 OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
252 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
253 # Non-SSE capable processor.
254 # NB: this may make SSE insns segfault!
255 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
256 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
257 # -m32 is needed if host is 64-bit
258 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
260 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
263 # Choice of alignment (please document why!)
264 # -falign-labels: in-line labels
265 # (reachable by normal code flow, aligning will insert nops
266 # which will be executed - may even make things slower)
267 # -falign-jumps: reachable only by a jump
268 # Generic: no alignment at all (smallest code)
269 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
270 ifeq ($(CONFIG_K7),y)
271 # Align functions to four bytes, use default for jumps and loops (why?)
272 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
274 ifeq ($(CONFIG_CRUSOE),y)
275 # Use compiler's default for functions, jumps and loops (why?)
276 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
278 ifeq ($(CONFIG_CYRIXIII),y)
279 # Use compiler's default for functions, jumps and loops (why?)
280 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
282 OPTIMIZATION+=$(GCC_FALIGN)
284 # Putting each function and data object into its own section
285 # allows for kbytes of less text if users link against static uclibc
286 # using ld --gc-sections.
287 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
288 # do not use --gc-sections at shared lib link time.
289 # However, in combination with sections being sorted by alignment
290 # it does result in much reduced padding:
291 # text data bss dec hex
292 # 235319 1472 5992 242783 3b45f old.so
293 # 234104 1472 5980 241556 3af94 new.so
294 # Without -ffunction-sections, all functions will get aligned
295 # to 4 byte boundary by as/ld. This is arguably a bug in as.
296 # It specifies 4 byte align for .text even if not told to do so:
297 # Idx Name Size VMA LMA File off Algn
298 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
299 CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
300 ifneq ($(call check_ld,--sort-common),)
301 CPU_LDFLAGS-y += -Wl,--sort-common
303 ifneq ($(call check_ld,--sort-section alignment),)
304 CPU_LDFLAGS-y += -Wl,--sort-section,alignment
309 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
310 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
311 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
312 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
313 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
314 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
315 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
316 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
317 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
318 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
319 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
320 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
321 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
322 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
323 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
324 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
327 ifeq ($(TARGET_ARCH),sparc)
328 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
329 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
330 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
331 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
334 ifeq ($(TARGET_ARCH),arm)
335 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
336 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
337 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
340 ifeq ($(TARGET_ARCH),mips)
341 OPTIMIZATION+=-mno-split-addresses
342 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
343 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
344 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
345 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
346 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
347 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
348 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
349 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
350 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
351 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
353 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
354 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
355 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
357 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
358 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
359 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
362 ifeq ($(TARGET_ARCH),nios)
363 OPTIMIZATION+=-funaligned-struct-hack
364 CPU_LDFLAGS-y+=-Wl,-m32
365 CPU_CFLAGS-y+=-Wl,-m32
368 ifeq ($(TARGET_ARCH),sh)
369 OPTIMIZATION+= $(call check_gcc,-mprefergot,)
370 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
371 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
372 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
373 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
374 ifeq ($(UCLIBC_HAS_FPU),y)
375 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
376 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
378 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
379 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
383 ifeq ($(TARGET_ARCH),sh64)
384 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
385 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
386 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
389 ifeq ($(TARGET_ARCH),h8300)
391 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
392 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
393 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
394 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
397 ifeq ($(TARGET_ARCH),i960)
398 OPTIMIZATION+=-mh -mint32 #-fsigned-char
401 ifeq ($(TARGET_ARCH),e1)
402 OPTIMIZATION+=-mgnu-param
405 ifeq ($(TARGET_ARCH),cris)
406 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
407 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
408 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
413 ifeq ($(TARGET_ARCH),m68k)
414 # -fPIC is only supported for 68020 and above. It is not supported
415 # for 68000, 68010, or Coldfire.
420 ifeq ($(TARGET_ARCH),powerpc)
421 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
422 # enough. Therefore use -fpic which will reduce code size and generates
426 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
427 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
428 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
432 ifeq ($(TARGET_ARCH),bfin)
434 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
435 CPU_CFLAGS-y:=-mfdpic
436 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
440 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
441 PICFLAG := -mleaf-id-shared-library
445 ifeq ($(TARGET_ARCH),frv)
446 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
447 # Using -pie causes the program to have an interpreter, which is
448 # forbidden, so we must make do with -shared. Unfortunately,
449 # -shared by itself would get us global function descriptors
450 # and calls through PLTs, dynamic resolution of symbols, etc,
451 # which would break as well, but -Bsymbolic comes to the rescue.
452 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
456 ifeq ($(strip $(TARGET_ARCH)),avr32)
457 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
458 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
459 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
462 ifeq ($(TARGET_ARCH),i960)
466 ifeq ($(TARGET_ARCH),v850)
470 ifeq ($(TARGET_ARCH),c6x)
472 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
473 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
474 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
475 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
476 CPU_LDFLAGS-y += $(CPU_CFLAGS)
479 # Keep the check_gcc from being needlessly executed
481 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
483 # We need to keep track of both the CC PIE flag (above) as
484 # well as the LD PIE flag (below) because we can't rely on
485 # gcc passing -pie if we used -fPIE. We need to directly use -pie
486 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
488 export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
491 # Check for --as-needed support in linker
492 ifndef LD_FLAG_ASNEEDED
493 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
494 ifneq ($(_LD_FLAG_ASNEEDED),)
495 export LD_FLAG_ASNEEDED:=--as-needed
498 ifndef LD_FLAG_NO_ASNEEDED
499 ifdef LD_FLAG_ASNEEDED
500 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
503 ifndef CC_FLAG_ASNEEDED
504 ifdef LD_FLAG_ASNEEDED
505 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
508 ifndef CC_FLAG_NO_ASNEEDED
509 ifdef LD_FLAG_NO_ASNEEDED
510 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
513 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
515 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
517 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
518 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
519 # Only used in installed libc.so linker script
520 UBACKTRACE_FULL_NAME := $(RUNTIME_PREFIX)lib/$(UBACKTRACE_DSO)
521 export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UBACKTRACE_FULL_NAME) )" || echo "$(UBACKTRACE_FULL_NAME)")
523 export UBACKTRACE_ASNEEDED:=""
527 # Add a bunch of extra pedantic annoyingly strict checks
528 XWARNINGS=$(call qstrip,$(WARNINGS))
529 XWARNINGS+=$(foreach w,\
530 -Wstrict-prototypes \
532 , $(call check_gcc,$(w),))
533 ifeq ($(EXTRA_WARNINGS),y)
534 XWARNINGS+=$(foreach w,\
537 -Wmissing-format-attribute \
538 -Wmissing-prototypes \
539 -Wmissing-declarations \
542 -Wold-style-declaration \
543 -Wold-style-definition \
546 , $(call check_gcc,$(w),))
547 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
548 #XWARNINGS+=-Wdeclaration-after-statement
550 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
552 SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
553 ifeq ($(UCLIBC_BUILD_SSP),y)
554 SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
555 SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
556 SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
558 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
561 NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
563 # Collect all CFLAGS components
564 CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
565 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
566 -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
567 -I$(top_srcdir)libc/sysdeps/linux \
568 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
570 # We need this to be checked within libc-symbols.h
571 ifneq ($(HAVE_SHARED),y)
575 LDFLAG_WARN_ONCE:=$(if $(call check_ld,--warn-once),-Wl$(comma)--warn-once)
576 LDFLAG_SORT_COMMON:=$(if $(call check_ld,--sort-common),-Wl$(comma)--sort-common)
577 LDFLAG_DISCARD_ALL:=$(if $(call check_ld,--discard-all),-Wl$(comma)--discard-all)
578 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
579 -Wl,--warn-common $(LDFLAG_WARN_ONCE) -Wl,-z,combreloc
580 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
581 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
583 ifeq ($(UCLIBC_BUILD_RELRO),y)
584 LDFLAGS_NOSTRIP+=-Wl,-z,relro
587 ifeq ($(UCLIBC_BUILD_NOW),y)
588 LDFLAGS_NOSTRIP+=-Wl,-z,now
591 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
592 # Be sure that binutils support it
593 LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
594 ifeq ($(LDFLAGS_GNUHASH),)
595 ifneq ($(filter-out $(clean_targets) install_headers headers-y,$(MAKECMDGOALS)),)
596 $(error Your binutils do not support --hash-style option, while you want to use it)
599 LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
603 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
605 CFLAGS += -O0 -g3 -DDEBUG
607 CFLAGS += $(OPTIMIZATION)
612 STRIPTOOL := true -Stripping_disabled
614 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
615 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
619 # we try to compile all sources at once into an object (IMA), but
620 # gcc-3.3.x does not support it
621 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
622 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
623 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
624 ifeq ($(GCC_MAJOR_VER),3)
627 CFLAGS+=$(call check_gcc,--combine,)
633 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
634 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
637 ifeq ($(UCLIBC_HAS_THREADS),y)
638 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
640 CFLAGS += -DHAVE_FORCED_UNWIND
642 ifeq ($(LINUXTHREADS_OLD),y)
643 PTNAME := linuxthreads.old
645 PTNAME := linuxthreads
648 PTDIR := libpthread/$(PTNAME)
649 # set up system dependencies include dirs (NOTE: order matters!)
650 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
651 PTINC:= -I$(top_builddir)$(PTDIR) \
652 -I$(top_srcdir)$(PTDIR) \
653 $(if $(TARGET_ARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
654 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
655 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
656 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
657 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
658 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
659 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
660 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
661 -I$(top_srcdir)$(PTDIR)/sysdeps/generic \
662 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
663 -I$(top_srcdir)ldso/include
665 # Test for TLS if NPTL support was selected.
667 GCC_HAS_TLS=$(shell \
668 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
669 ifneq ($(GCC_HAS_TLS),)
672 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
673 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
674 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
675 @echo "#### about this problem.";
677 @echo "#### Exiting...";
683 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
684 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
685 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
686 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
687 -I$(top_srcdir)$(PTDIR) \
688 -I$(top_srcdir)libpthread
695 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
696 CFLAGS += -I$(KERNEL_HEADERS)
698 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
699 CC_IPREFIX := $(shell $(CC) --print-file-name=include)
700 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
703 ifneq ($(DOASSERTS),y)
707 ifeq ($(SYMBOL_PREFIX),_)
708 CFLAGS+=-D__UCLIBC_UNDERSCORES__
711 # Keep the check_as from being needlessly executed
712 ifndef ASFLAGS_NOEXEC
713 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
714 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
716 export ASFLAGS_NOEXEC :=
719 ASFLAGS = $(ASFLAGS_NOEXEC)
721 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
722 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
723 LIBGCC_DIR:=$(dir $(LIBGCC))
725 # moved from libpthread/linuxthreads
726 ifeq ($(UCLIBC_CTOR_DTOR),y)
727 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
728 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
731 LOCAL_INSTALL_PATH := install_dir