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 sub_headers := $(headers_dep)
171 #LIBS :=$(interp) -L$(top_builddir)lib -lc
172 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
174 # Make sure DESTDIR and PREFIX can be used to install
175 # PREFIX is a uClibcism while DESTDIR is a common GNUism
180 ifneq ($(HAVE_SHARED),y)
189 ifeq ($(CROSS_COMPILE),)
190 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
193 # A nifty macro to make testing gcc features easier
195 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
196 then echo "$(1)"; else echo "$(2)"; fi)
198 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
199 then echo "-Wa,$(1)"; fi)
201 if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
202 then echo "$(1)"; fi)
204 # Use variable indirection here so that we can have variable
205 # names with fun chars in them like equal signs
206 define check-tool-var
207 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
210 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
216 # Usage: check-gcc-var,<flag>
217 # Check the C compiler to see if it supports <flag>.
218 # Export the variable CFLAG_<flag> if it does.
220 $(call check-tool-var,check_gcc,CFLAG,$(1))
222 # Usage: check-as-var,<flag>
223 # Check the assembler to see if it supports <flag>. Export the
224 # variable ASFLAG_<flag> if it does (for invoking the assembler),
225 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
227 $(call check-tool-var,check_as,ASFLAG,$(1))
229 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
231 # Usage: check-ld-var,<flag>
232 # Check the linker to see if it supports <flag>. Export the
233 # variable LDFLAG_<flag> if it does (for invoking the linker),
234 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
236 $(call check-tool-var,check_ld,LDFLAG,$(1))
238 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
240 # Usage: cache-output-var,<variable>,<shell command>
241 # Execute <shell command> and cache the output in <variable>.
242 define cache-output-var
244 $(1) := $$(shell $(2))
252 # Note: The check for -nostdlib has to be before all calls to check_ld
253 $(eval $(call check-gcc-var,-nostdlib))
254 # deliberately not named CFLAG-fuse-ld since unchecked and from user
255 LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
256 # failed to merge target specific data of file /dev/null
257 # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
258 $(eval $(call check-ld-var,--no-warn-mismatch))
260 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
261 GCC_VER := $(subst ., ,$(GCC_VER))
262 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
263 GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
265 # Flags in OPTIMIZATION are used only for non-debug builds
268 OPTIMIZATION-$(GCC_MAJOR_VER):=
269 OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
271 # Use '-Os' optimization if available, else use -O2, allow Config to override
272 $(eval $(call check-gcc-var,-Os))
273 ifneq ($(CFLAG_-Os),)
274 OPTIMIZATION += $(CFLAG_-Os)
276 $(eval $(call check-gcc-var,-O2))
277 OPTIMIZATION += $(CFLAG_-O2)
279 # Use the gcc 3.4 -funit-at-a-time optimization when available
280 $(eval $(call check-gcc-var,-funit-at-a-time))
281 OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
282 $(eval $(call check-gcc-var,-fstrict-aliasing))
283 OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
285 # CPU_CFLAGS-y contain options which are not warnings,
286 # not include or library paths, and not optimizations.
288 # Why -funsigned-char: I hunted a bug related to incorrect
289 # sign extension of 'char' type for 10 hours straight. Not fun.
290 CPU_CFLAGS-y := -funsigned-char -fno-builtin
292 $(eval $(call check-gcc-var,-fno-asm))
293 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
296 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
297 ifneq ($(TARGET_ARCH),bfin)
298 ifneq ($(TARGET_ARCH),nios2)
299 ifneq ($(TARGET_ARCH),sh)
300 ifneq ($(TARGET_ARCH),c6x)
301 CPU_CFLAGS-y += -msoft-float
308 $(eval $(call check-gcc-var,-std=gnu99))
309 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
311 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
312 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
314 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
315 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
318 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
319 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
320 PICFLAG := $(PICFLAG-y)
323 # Some nice CPU specific optimizations
324 ifeq ($(TARGET_ARCH),i386)
325 $(eval $(call check-gcc-var,-fomit-frame-pointer))
326 OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
328 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
329 # TODO: Change this to a gcc version check. This bug
330 # should be fixed with at least gcc-4.3.
331 # Non-SSE capable processor.
332 # NB: this may make SSE insns segfault!
333 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
334 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
335 # -m32 is needed if host is 64-bit
336 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
338 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
339 OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
342 # Choice of alignment (please document why!)
343 # -falign-labels: in-line labels
344 # (reachable by normal code flow, aligning will insert nops
345 # which will be executed - may even make things slower)
346 # -falign-jumps: reachable only by a jump
347 # Generic: no alignment at all (smallest code)
348 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
349 OPTIMIZATION+=$(GCC_FALIGN)
351 # Putting each function and data object into its own section
352 # allows for kbytes of less text if users link against static uclibc
353 # using ld --gc-sections.
354 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
355 # do not use --gc-sections at shared lib link time.
356 # However, in combination with sections being sorted by alignment
357 # it does result in much reduced padding:
358 # text data bss dec hex
359 # 235319 1472 5992 242783 3b45f old.so
360 # 234104 1472 5980 241556 3af94 new.so
361 # Without -ffunction-sections, all functions will get aligned
362 # to 4 byte boundary by as/ld. This is arguably a bug in as.
363 # It specifies 4 byte align for .text even if not told to do so:
364 # Idx Name Size VMA LMA File off Algn
365 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
366 CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
367 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
368 $(eval $(call check-ld-var,--sort-section=alignment))
369 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
375 ifeq ($(TARGET_ARCH),sparc)
376 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
377 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
378 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
379 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
382 ifeq ($(TARGET_ARCH),arm)
383 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
384 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
385 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
388 ifeq ($(TARGET_ARCH),metag)
390 CPU_CFLAGS-$(CONFIG_META_1_2)+=
391 CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
394 ifeq ($(TARGET_ARCH),mips)
395 OPTIMIZATION+=-mno-split-addresses
396 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
397 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
398 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
399 CPU_LDFLAGS-y += $(CPU_CFLAGS)
402 ifeq ($(TARGET_ARCH),sh)
403 $(eval $(call check-gcc-var,-mprefergot))
404 OPTIMIZATION += $(CFLAG_-mprefergot)
405 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
406 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
407 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
408 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
409 ifeq ($(UCLIBC_HAS_FPU),y)
410 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
411 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
413 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
414 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
418 ifeq ($(TARGET_ARCH),h8300)
419 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-mh8300h_linux
420 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-mh8300s_linux
421 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
422 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
425 ifeq ($(TARGET_ARCH),i960)
426 OPTIMIZATION+=-mh -mint32 #-fsigned-char
429 ifeq ($(TARGET_ARCH),cris)
430 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
431 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
432 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
437 ifeq ($(TARGET_ARCH),m68k)
438 # -fPIC is only supported for 68020 and above. It is not supported
439 # for 68000, 68010, or Coldfire.
444 ifeq ($(TARGET_ARCH),powerpc)
445 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
446 # enough. Therefore use -fpic which will reduce code size and generates
450 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
451 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
452 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
456 ifeq ($(TARGET_ARCH),bfin)
458 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
459 CPU_CFLAGS-y:=-mfdpic
460 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
464 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
465 PICFLAG := -mleaf-id-shared-library
469 ifeq ($(TARGET_ARCH),frv)
470 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
471 # Using -pie causes the program to have an interpreter, which is
472 # forbidden, so we must make do with -shared. Unfortunately,
473 # -shared by itself would get us global function descriptors
474 # and calls through PLTs, dynamic resolution of symbols, etc,
475 # which would break as well, but -Bsymbolic comes to the rescue.
476 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
480 ifeq ($(strip $(TARGET_ARCH)),avr32)
481 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
482 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
483 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
486 ifeq ($(TARGET_ARCH),i960)
490 ifeq ($(TARGET_ARCH),v850)
494 ifeq ($(TARGET_ARCH),c6x)
496 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
497 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
498 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
499 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
500 CPU_LDFLAGS-y += $(CPU_CFLAGS)
503 ifeq ($(TARGET_ARCH),arc)
504 CPU_CFLAGS-y += -mlock -mswape
505 CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
506 CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
507 CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
510 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
511 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
513 PIEFLAG := $(PICFLAG)
515 # We need to keep track of both the CC PIE flag (above) as
516 # well as the LD PIE flag (below) because we can't rely on
517 # gcc passing -pie if we used -fPIE. We need to directly use -pie
518 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
519 $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
521 # Check for --as-needed support in linker
522 ifndef LD_FLAG_ASNEEDED
523 _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
524 ifneq ($(_LD_FLAG_ASNEEDED),)
525 export LD_FLAG_ASNEEDED:=--as-needed
528 ifndef LD_FLAG_NO_ASNEEDED
529 ifdef LD_FLAG_ASNEEDED
530 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
533 ifndef CC_FLAG_ASNEEDED
534 ifdef LD_FLAG_ASNEEDED
535 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
538 ifndef CC_FLAG_NO_ASNEEDED
539 ifdef LD_FLAG_NO_ASNEEDED
540 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
543 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
545 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
547 export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
549 # Only used in installed libc.so linker script
550 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
551 ifeq ($(HARDWIRED_ABSPATH),y)
552 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
554 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
556 export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
557 echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
558 echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
560 export UBACKTRACE_ASNEEDED:=""
564 # Add a bunch of extra pedantic annoyingly strict checks
565 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
566 ifeq ($(EXTRA_WARNINGS),y)
570 -Wmissing-format-attribute \
571 -Wmissing-prototypes \
572 -Wmissing-declarations \
575 -Wold-style-declaration \
576 -Wold-style-definition \
579 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
580 #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
582 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
583 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
584 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
586 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
588 # Save the tested flag in a single variable and force it to be
589 # evaluated just once. Then use that computed value.
590 $(eval $(call check-gcc-var,-fno-stack-protector))
591 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
592 ifeq ($(UCLIBC_BUILD_SSP),y)
593 $(eval $(call check-gcc-var,-fno-stack-protector-all))
594 $(eval $(call check-gcc-var,-fstack-protector))
595 $(eval $(call check-gcc-var,-fstack-protector-all))
596 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
597 SSP_CFLAGS += $(CFLAG_-fstack-protector)
598 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
600 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
603 # Collect all CFLAGS components
604 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
605 -nostdinc -I$(top_builddir)include \
606 -I$(top_srcdir)include -include libc-symbols.h \
607 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
608 -I$(top_srcdir)libc/sysdeps/linux \
609 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
610 -I$(top_srcdir)ldso/include -I.
612 # We need this to be checked within libc-symbols.h
613 ifneq ($(HAVE_SHARED),y)
617 $(eval $(call check-ld-var,--warn-once))
618 $(eval $(call check-ld-var,--sort-common))
619 $(eval $(call check-ld-var,--discard-all))
620 LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
621 -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
622 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
623 #$(eval $(call check-ld-var,--gc-sections))
624 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
626 $(eval $(call check-gcc-var,-fdata-sections))
627 $(eval $(call check-gcc-var,-ffunction-sections))
629 ifeq ($(UCLIBC_BUILD_RELRO),y)
630 LDFLAGS_NOSTRIP+=-Wl,-z,relro
633 ifeq ($(UCLIBC_BUILD_NOW),y)
634 LDFLAGS_NOSTRIP+=-Wl,-z,now
637 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
638 # Be sure that binutils support it
639 $(eval $(call check-ld-var,--hash-style=gnu))
640 ifeq ($(LDFLAG_--hash-style=gnu),)
641 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
642 $(error Your binutils do not support --hash-style option, while you want to use it)
645 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
649 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
651 CFLAGS += -O0 -g3 -DDEBUG
653 CFLAGS += $(OPTIMIZATION)
654 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
655 CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
660 STRIPTOOL := true -Stripping_disabled
664 # we try to compile all sources at once into an object (IMA), but
665 # gcc-3.3.x does not support it
666 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
667 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
668 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
669 ifeq ($(GCC_MAJOR_VER),3)
672 $(eval $(call check-gcc-var,--combine))
673 CFLAGS += $(CFLAG_--combine)
679 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
680 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
682 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
683 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
686 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
687 CFLAGS += -D__USE_STDIO_FUTEXES__
690 ifeq ($(UCLIBC_HAS_THREADS),y)
691 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
693 CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
695 ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
696 PTNAME := linuxthreads
699 PTDIR := libpthread/$(PTNAME)
700 # set up system dependencies include dirs (NOTE: order matters!)
701 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
702 PTINC:= -I$(top_builddir)$(PTDIR) \
703 -I$(top_srcdir)$(PTDIR) \
704 $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
705 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
706 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
707 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
708 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
709 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
710 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
711 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
712 -I$(top_srcdir)$(PTDIR)/sysdeps/generic
714 # Test for TLS if NPTL support was selected.
716 GCC_HAS_TLS=$(shell \
717 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
718 ifneq ($(GCC_HAS_TLS),)
721 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
722 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
723 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
724 @echo "#### about this problem.";
726 @echo "#### Exiting...";
732 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
733 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
734 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
735 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
736 -I$(top_srcdir)$(PTDIR) \
737 -I$(top_srcdir)libpthread
744 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
746 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
747 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
748 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
751 CFLAGS += -I$(KERNEL_HEADERS)
753 ifneq ($(DOASSERTS),y)
757 ifeq ($(SYMBOL_PREFIX),_)
758 CFLAGS+=-D__UCLIBC_UNDERSCORES__
761 # Keep the check_as from being needlessly executed
762 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
763 $(eval $(call check-as-var,--noexecstack))
765 ASFLAGS += $(ASFLAG_--noexecstack)
767 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
768 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
769 LIBGCC_DIR:=$(dir $(LIBGCC))
771 # moved from libpthread/linuxthreads
772 ifeq ($(UCLIBC_CTOR_DTOR),y)
773 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
774 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
777 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
779 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"