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.
30 clean_targets := clean realclean distclean \
31 objclean-y headers_clean-y CLEAN_utils
32 noconfig_targets := menuconfig config nconfig \
33 oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
34 alldefconfig randconfig defconfig savedefconfig listnewconfig \
36 xconfig gconfig update-po-config mconf qconf gconf nconf conf \
37 release dist tags help
40 #-----------------------------------------------------------
41 # If you are running a cross compiler, you will want to set
42 # 'CROSS_COMPILE' to something more interesting ... Target
43 # architecture is determined by asking the CC compiler what
44 # arch it compiles things for, so unless your compiler is
45 # broken, you should not need to specify TARGET_ARCH.
47 # Most people will set this stuff on the command line, i.e.
48 # make CROSS_COMPILE=arm-linux-
49 # will build uClibc for 'arm'.
50 # CROSS is still supported for backward compatibily only
52 CROSS_COMPILE ?= $(CROSS)
54 CC = $(CROSS_COMPILE)gcc
55 AR = $(CROSS_COMPILE)ar
56 LD = $(CROSS_COMPILE)ld
57 NM = $(CROSS_COMPILE)nm
58 OBJDUMP = $(CROSS_COMPILE)objdump
59 STRIPTOOL = $(CROSS_COMPILE)strip
68 STRIP_FLAGS ?= -x -R .note -R .comment
70 # Select the compiler needed to build binaries for your development system
74 #---------------------------------------------------------
75 # Nothing beyond this point should ever be touched by mere
76 # mortals. Unless you hang out with the gods, you should
77 # probably leave all this stuff alone.
80 qstrip = $(strip $(subst ",,$(1)))
84 KCONFIG_CONFIG ?= $(top_builddir).config
85 KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
87 KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
88 export KCONFIG_AUTOCONFIG
89 KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
90 export KCONFIG_TRISTATE
91 srctree := $(abspath $(top_srcdir))
93 KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
94 export KCONFIG_AUTOHEADER
95 Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
97 # Pull in the user's uClibc configuration
98 ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
99 -include $(KCONFIG_CONFIG)
102 TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
103 ifeq ($(TARGET_ARCH),)
104 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
105 -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
106 -e s/arm.*/arm/ -e s/sa110/arm/ \
108 -e s/s390x/s390/ -e s/parisc.*/hppa/ \
109 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
110 -e s/xtensa.*/xtensa/ )
112 ARCH = $(TARGET_ARCH)
116 # Make certain these contain a final "/", but no "//"s.
117 scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
118 TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
119 RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
120 DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
121 MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
122 KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
123 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
126 # Now config hard core
131 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
132 ABI_VERSION := $(MAJOR_VERSION)
133 ifneq ($(EXTRAVERSION),)
134 VERSION := $(VERSION)$(EXTRAVERSION)
136 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
138 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
141 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
142 UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
144 UCLIBC_LDSO_NAME := ld-uClibc
145 ARCH_NATIVE_BIT := 32
146 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
147 UCLIBC_LDSO_NAME := ld64-uClibc
148 ARCH_NATIVE_BIT := 64
150 ifeq ($(CONFIG_MIPS_N64_ABI),y)
151 UCLIBC_LDSO_NAME := ld64-uClibc
152 ARCH_NATIVE_BIT := 64
156 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
157 NONSHARED_LIBNAME := uclibc_nonshared.a
158 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
159 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
160 ifneq ($(ARCH_HAS_NO_SHARED),y)
161 libdl.depend := $(top_builddir)lib/libdl.so
163 ifneq ($(HAS_NO_THREADS),y)
164 libpthread.depend := $(top_builddir)lib/libpthread.so
166 interp := $(top_builddir)lib/interp.os
167 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
168 headers_dep := $(top_builddir)include/bits/sysnum.h \
169 $(top_builddir)include/bits/uClibc_config.h
170 sub_headers := $(headers_dep)
172 #LIBS :=$(interp) -L$(top_builddir)lib -lc
173 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
175 # Make sure DESTDIR and PREFIX can be used to install
176 # PREFIX is a uClibcism while DESTDIR is a common GNUism
181 ifneq ($(HAVE_SHARED),y)
190 ifeq ($(CROSS_COMPILE),)
191 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
194 # A nifty macro to make testing gcc features easier
196 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
197 then echo "$(1)"; else echo "$(2)"; fi)
199 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
200 then echo "-Wa,$(1)"; fi)
202 if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
203 then echo "$(1)"; fi)
205 # Use variable indirection here so that we can have variable
206 # names with fun chars in them like equal signs
207 define check-tool-var
208 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
211 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
217 # Usage: check-gcc-var,<flag>
218 # Check the C compiler to see if it supports <flag>.
219 # Export the variable CFLAG_<flag> if it does.
221 $(call check-tool-var,check_gcc,CFLAG,$(1))
223 # Usage: check-as-var,<flag>
224 # Check the assembler to see if it supports <flag>. Export the
225 # variable ASFLAG_<flag> if it does (for invoking the assembler),
226 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
228 $(call check-tool-var,check_as,ASFLAG,$(1))
230 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
232 # Usage: check-ld-var,<flag>
233 # Check the linker to see if it supports <flag>. Export the
234 # variable LDFLAG_<flag> if it does (for invoking the linker),
235 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
237 $(call check-tool-var,check_ld,LDFLAG,$(1))
239 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
241 # Usage: cache-output-var,<variable>,<shell command>
242 # Execute <shell command> and cache the output in <variable>.
243 define cache-output-var
245 $(1) := $$(shell $(2))
253 # Note: The check for -nostdlib has to be before all calls to check_ld
254 $(eval $(call check-gcc-var,-nostdlib))
255 $(eval $(call check-gcc-var,-nostartfiles))
256 # deliberately not named CFLAG-fuse-ld since unchecked and from user
257 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
258 # failed to merge target specific data of file /dev/null
259 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
260 $(eval $(call check-ld-var,--no-warn-mismatch))
262 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
263 GCC_VER := $(subst ., ,$(GCC_VER))
264 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
265 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
267 # Flags in OPTIMIZATION are used only for non-debug builds
270 OPTIMIZATION-$(GCC_MAJOR_VER):=
271 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
273 # Use '-Os' optimization if available, else use -O2, allow Config to override
274 $(eval $(call check-gcc-var,-Os))
275 ifneq ($(CFLAG_-Os),)
276 OPTIMIZATION += $(CFLAG_-Os)
278 $(eval $(call check-gcc-var,-O2))
279 OPTIMIZATION += $(CFLAG_-O2)
281 # Use the gcc 3.4 -funit-at-a-time optimization when available
282 $(eval $(call check-gcc-var,-funit-at-a-time))
283 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
284 $(eval $(call check-gcc-var,-fstrict-aliasing))
285 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
287 # CPU_CFLAGS-y contain options which are not warnings,
288 # not include or library paths, and not optimizations.
290 # Why -funsigned-char: I hunted a bug related to incorrect
291 # sign extension of 'char' type for 10 hours straight. Not fun.
292 CPU_CFLAGS-y := -funsigned-char -fno-builtin
294 $(eval $(call check-gcc-var,-fno-asm))
295 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
296 $(eval $(call check-gcc-var,-fmerge-all-constants))
297 CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
300 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
301 ifneq ($(TARGET_ARCH),bfin)
302 ifneq ($(TARGET_ARCH),nios2)
303 ifneq ($(TARGET_ARCH),sh)
304 ifneq ($(TARGET_ARCH),c6x)
305 ifneq ($(TARGET_ARCH),h8300)
306 CPU_CFLAGS-y += -msoft-float
314 $(eval $(call check-gcc-var,-std=gnu99))
315 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
317 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
318 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
320 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
321 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
324 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
325 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
326 PICFLAG := $(PICFLAG-y)
329 # Some nice CPU specific optimizations
330 ifeq ($(TARGET_ARCH),i386)
331 $(eval $(call check-gcc-var,-fomit-frame-pointer))
332 OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
334 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
335 # TODO: Change this to a gcc version check. This bug
336 # should be fixed with at least gcc-4.3.
337 # Non-SSE capable processor.
338 # NB: this may make SSE insns segfault!
339 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
340 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
341 # -m32 is needed if host is 64-bit
342 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
344 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
345 OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
348 # Choice of alignment (please document why!)
349 # -falign-labels: in-line labels
350 # (reachable by normal code flow, aligning will insert nops
351 # which will be executed - may even make things slower)
352 # -falign-jumps: reachable only by a jump
353 # Generic: no alignment at all (smallest code)
354 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
355 OPTIMIZATION+=$(GCC_FALIGN)
357 # Putting each function and data object into its own section
358 # allows for kbytes of less text if users link against static uclibc
359 # using ld --gc-sections.
360 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
361 # do not use --gc-sections at shared lib link time.
362 # However, in combination with sections being sorted by alignment
363 # it does result in much reduced padding:
364 # text data bss dec hex
365 # 235319 1472 5992 242783 3b45f old.so
366 # 234104 1472 5980 241556 3af94 new.so
367 # Without -ffunction-sections, all functions will get aligned
368 # to 4 byte boundary by as/ld. This is arguably a bug in as.
369 # It specifies 4 byte align for .text even if not told to do so:
370 # Idx Name Size VMA LMA File off Algn
371 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
372 CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
373 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
374 $(eval $(call check-ld-var,--sort-section=alignment))
375 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
381 ifeq ($(TARGET_ARCH),sparc)
382 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
383 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
384 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
385 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
388 ifeq ($(TARGET_ARCH),arm)
389 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
390 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
391 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
394 ifeq ($(TARGET_ARCH),metag)
396 CPU_CFLAGS-$(CONFIG_META_1_2)+=
397 CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
400 ifeq ($(TARGET_ARCH),mips)
401 OPTIMIZATION+=-mno-split-addresses
402 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
403 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
404 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
405 CPU_LDFLAGS-y += $(CPU_CFLAGS)
408 ifeq ($(TARGET_ARCH),sh)
409 $(eval $(call check-gcc-var,-mprefergot))
410 OPTIMIZATION += $(CFLAG_-mprefergot)
411 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
412 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
413 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
414 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
415 ifeq ($(UCLIBC_HAS_FPU),y)
416 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
417 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
419 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
420 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
424 ifeq ($(TARGET_ARCH),h8300)
425 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-mh8300h_linux
426 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-mh8300s_linux
427 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
428 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
431 ifeq ($(TARGET_ARCH),i960)
432 OPTIMIZATION+=-mh -mint32 #-fsigned-char
435 ifeq ($(TARGET_ARCH),cris)
436 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
437 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
438 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
443 ifeq ($(TARGET_ARCH),m68k)
444 # -fPIC is only supported for 68020 and above. It is not supported
445 # for 68000, 68010, or Coldfire.
450 ifeq ($(TARGET_ARCH),powerpc)
451 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
452 # enough. Therefore use -fpic which will reduce code size and generates
456 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
457 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
458 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
462 ifeq ($(TARGET_ARCH),bfin)
464 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
465 CPU_CFLAGS-y:=-mfdpic
466 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
470 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
471 PICFLAG := -mleaf-id-shared-library
475 ifeq ($(TARGET_ARCH),frv)
476 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
477 # Using -pie causes the program to have an interpreter, which is
478 # forbidden, so we must make do with -shared. Unfortunately,
479 # -shared by itself would get us global function descriptors
480 # and calls through PLTs, dynamic resolution of symbols, etc,
481 # which would break as well, but -Bsymbolic comes to the rescue.
482 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
486 ifeq ($(strip $(TARGET_ARCH)),avr32)
487 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
488 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
489 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
492 ifeq ($(TARGET_ARCH),i960)
496 ifeq ($(TARGET_ARCH),v850)
500 ifeq ($(TARGET_ARCH),c6x)
502 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
503 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
504 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
505 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
506 CPU_LDFLAGS-y += $(CPU_CFLAGS)
509 ifeq ($(TARGET_ARCH),arc)
510 CPU_CFLAGS-y += -mlock -mswape
511 CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
512 CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
513 CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
516 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
517 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
519 PIEFLAG := $(PICFLAG)
521 # We need to keep track of both the CC PIE flag (above) as
522 # well as the LD PIE flag (below) because we can't rely on
523 # gcc passing -pie if we used -fPIE. We need to directly use -pie
524 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
525 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
527 # Check for --as-needed support in linker
528 ifndef LD_FLAG_ASNEEDED
529 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
530 ifneq ($(_LD_FLAG_ASNEEDED),)
531 export LD_FLAG_ASNEEDED:=--as-needed
534 ifndef LD_FLAG_NO_ASNEEDED
535 ifdef LD_FLAG_ASNEEDED
536 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
539 ifndef CC_FLAG_ASNEEDED
540 ifdef LD_FLAG_ASNEEDED
541 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
544 ifndef CC_FLAG_NO_ASNEEDED
545 ifdef LD_FLAG_NO_ASNEEDED
546 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
549 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
551 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
553 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
555 # Only used in installed libc.so linker script
556 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
557 ifeq ($(HARDWIRED_ABSPATH),y)
558 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
560 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
562 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
563 echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
564 echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
566 export UBACKTRACE_ASNEEDED:=""
570 # Add a bunch of extra pedantic annoyingly strict checks
571 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
572 ifeq ($(EXTRA_WARNINGS),y)
576 -Wmissing-format-attribute \
577 -Wmissing-prototypes \
578 -Wmissing-declarations \
581 -Wold-style-declaration \
582 -Wold-style-definition \
585 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
586 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
588 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
589 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
590 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
592 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
594 # Save the tested flag in a single variable and force it to be
595 # evaluated just once. Then use that computed value.
596 $(eval $(call check-gcc-var,-fno-stack-protector))
597 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
598 ifeq ($(UCLIBC_BUILD_SSP),y)
599 $(eval $(call check-gcc-var,-fno-stack-protector-all))
600 $(eval $(call check-gcc-var,-fstack-protector))
601 $(eval $(call check-gcc-var,-fstack-protector-all))
602 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
603 SSP_CFLAGS += $(CFLAG_-fstack-protector)
604 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
606 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
609 # Collect all CFLAGS components
610 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
611 -nostdinc -I$(top_builddir)include \
612 -I$(top_srcdir)include -include libc-symbols.h \
613 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
614 -I$(top_srcdir)libc/sysdeps/linux \
615 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
616 -I$(top_srcdir)ldso/include -I.
618 # We need this to be checked within libc-symbols.h
619 ifneq ($(HAVE_SHARED),y)
623 $(eval $(call check-ld-var,--warn-once))
624 $(eval $(call check-ld-var,--sort-common))
625 $(eval $(call check-ld-var,--discard-all))
626 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
627 -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
628 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
629 #$(eval $(call check-ld-var,--gc-sections))
630 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
632 $(eval $(call check-gcc-var,-fdata-sections))
633 $(eval $(call check-gcc-var,-ffunction-sections))
635 ifeq ($(UCLIBC_BUILD_RELRO),y)
636 LDFLAGS_NOSTRIP+=-Wl,-z,relro
639 ifeq ($(UCLIBC_BUILD_NOW),y)
640 LDFLAGS_NOSTRIP+=-Wl,-z,now
643 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
644 # Be sure that binutils support it
645 $(eval $(call check-ld-var,--hash-style=gnu))
646 ifeq ($(LDFLAG_--hash-style=gnu),)
647 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
648 $(error Your binutils do not support --hash-style option, while you want to use it)
651 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
656 CFLAGS += -O0 -g3 -DDEBUG
658 CFLAGS += $(OPTIMIZATION)
659 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
660 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
661 $(eval $(call check-ld-var,-O2))
662 LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
665 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
670 STRIPTOOL := true -Stripping_disabled
674 # we try to compile all sources at once into an object (IMA), but
675 # gcc-3.3.x does not support it
676 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
677 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
678 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
679 ifeq ($(GCC_MAJOR_VER),3)
682 $(eval $(call check-gcc-var,--combine))
683 CFLAGS += $(CFLAG_--combine)
689 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
690 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
692 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
693 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
696 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
697 CFLAGS += -D__USE_STDIO_FUTEXES__
700 ifeq ($(UCLIBC_HAS_THREADS),y)
701 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
703 CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
705 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
706 PTNAME := linuxthreads
709 PTDIR := libpthread/$(PTNAME)
710 # set up system dependencies include dirs (NOTE: order matters!)
711 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
712 PTINC:= -I$(top_builddir)$(PTDIR) \
713 -I$(top_srcdir)$(PTDIR) \
714 $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
715 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
716 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
717 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
718 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
719 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
720 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
721 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
722 -I$(top_srcdir)$(PTDIR)/sysdeps/generic
724 # Test for TLS if NPTL support was selected.
726 GCC_HAS_TLS=$(shell \
727 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
728 ifneq ($(GCC_HAS_TLS),)
731 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
732 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
733 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
734 @echo "#### about this problem.";
736 @echo "#### Exiting...";
742 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
743 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
744 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
745 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
746 -I$(top_srcdir)$(PTDIR) \
747 -I$(top_srcdir)libpthread
754 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
756 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
757 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
758 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
761 CFLAGS += -I$(KERNEL_HEADERS)
763 ifneq ($(DOASSERTS),y)
767 ifeq ($(SYMBOL_PREFIX),_)
768 CFLAGS+=-D__UCLIBC_UNDERSCORES__
771 # Keep the check_as from being needlessly executed
772 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
773 $(eval $(call check-as-var,--noexecstack))
775 ASFLAGS += $(ASFLAG_--noexecstack)
777 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
778 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
779 LIBGCC_DIR:=$(dir $(LIBGCC))
781 # moved from libpthread/linuxthreads
782 ifeq ($(UCLIBC_CTOR_DTOR),y)
783 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
784 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
787 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
789 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"