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 oldconfig silentoldconfig randconfig \
33 defconfig allyesconfig allnoconfig \
34 xconfig gconfig update-po-config mconf qconf gconf conf \
35 release dist tags help
38 #-----------------------------------------------------------
39 # If you are running a cross compiler, you will want to set
40 # 'CROSS_COMPILE' to something more interesting ... Target
41 # architecture is determined by asking the CC compiler what
42 # arch it compiles things for, so unless your compiler is
43 # broken, you should not need to specify TARGET_ARCH.
45 # Most people will set this stuff on the command line, i.e.
46 # make CROSS_COMPILE=arm-linux-
47 # will build uClibc for 'arm'.
48 # CROSS is still supported for backward compatibily only
50 CROSS_COMPILE ?= $(CROSS)
52 CC = $(CROSS_COMPILE)gcc
53 AR = $(CROSS_COMPILE)ar
54 LD = $(CROSS_COMPILE)ld
55 NM = $(CROSS_COMPILE)nm
56 OBJDUMP = $(CROSS_COMPILE)objdump
57 STRIPTOOL = $(CROSS_COMPILE)strip
66 STRIP_FLAGS ?= -x -R .note -R .comment
68 ## unused? if yes, remove after 0.9.31
69 ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
71 # Select the compiler needed to build binaries for your development system
73 BUILD_CFLAGS = -Os -Wall
75 #---------------------------------------------------------
76 # Nothing beyond this point should ever be touched by mere
77 # mortals. Unless you hang out with the gods, you should
78 # probably leave all this stuff alone.
81 qstrip = $(strip $(subst ",,$(1)))
85 KCONFIG_CONFIG := $(top_builddir).config
88 # Pull in the user's uClibc configuration
89 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
90 # Prevent make from searching
91 __ABS_KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
92 -include $(__ABS_KCONFIG_CONFIG)
94 # else we have to tell config where to write .config
97 ifeq ($(HAVE_DOT_CONFIG),y)
98 # tell config where our .config lives
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.$(ABI_VERSION)
143 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
144 UCLIBC_LDSO_NAME := ld64-uClibc
145 ARCH_NATIVE_BIT := 64
147 UCLIBC_LDSO_NAME := ld-uClibc
148 ARCH_NATIVE_BIT := 32
150 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
151 NONSHARED_LIBNAME := uclibc_nonshared.a
152 libc := $(top_builddir)lib/$(SHARED_LIBNAME)
153 libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
154 ifneq ($(ARCH_HAS_NO_SHARED),y)
155 libdl.depend := $(top_builddir)lib/libdl.so
157 ifneq ($(HAS_NO_THREADS),y)
158 libpthread.depend := $(top_builddir)lib/libpthread.so
160 interp := $(top_builddir)lib/interp.os
161 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
162 headers_dep := $(top_builddir)include/bits/sysnum.h
163 sub_headers := $(headers_dep)
165 #LIBS :=$(interp) -L$(top_builddir)lib -lc
166 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
168 # Make sure DESTDIR and PREFIX can be used to install
169 # PREFIX is a uClibcism while DESTDIR is a common GNUism
174 ifneq ($(HAVE_SHARED),y)
183 ifeq ($(CROSS_COMPILE),)
184 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
187 # A nifty macro to make testing gcc features easier
189 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
190 then echo "$(1)"; else echo "$(2)"; fi)
192 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
193 then echo "-Wa,$(1)"; fi)
195 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
196 then echo "$(1)"; fi)
198 # Use variable indirection here so that we can have variable
199 # names with fun chars in them like equal signs
200 define check-tool-var
201 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
204 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
210 # Usage: check-gcc-var,<flag>
211 # Check the C compiler to see if it supports <flag>.
212 # Export the variable CFLAG_<flag> if it does.
214 $(call check-tool-var,check_gcc,CFLAG,$(1))
216 # Usage: check-as-var,<flag>
217 # Check the assembler to see if it supports <flag>. Export the
218 # variable ASFLAG_<flag> if it does (for invoking the assembler),
219 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
221 $(call check-tool-var,check_as,ASFLAG,$(1))
223 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
225 # Usage: check-ld-var,<flag>
226 # Check the linker to see if it supports <flag>. Export the
227 # variable LDFLAG_<flag> if it does (for invoking the linker),
228 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
230 $(call check-tool-var,check_ld,LDFLAG,$(1))
232 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
234 # Usage: cache-output-var,<variable>,<shell command>
235 # Execute <shell command> and cache the output in <variable>.
236 define cache-output-var
238 $(1) := $$(shell $(2))
247 # Flags in OPTIMIZATION are used only for non-debug builds
250 # Use '-Os' optimization if available, else use -O2, allow Config to override
251 $(eval $(call check-gcc-var,-Os))
252 ifneq ($(CFLAG_-Os),)
253 OPTIMIZATION += $(CFLAG_-Os)
255 $(eval $(call check-gcc-var,-O2))
256 OPTIMIZATION += $(CFLAG_-O2)
258 # Use the gcc 3.4 -funit-at-a-time optimization when available
259 $(eval $(call check-gcc-var,-funit-at-a-time))
260 OPTIMIZATION += $(CFLAG_-funit-at-a-time)
261 # shrinks code by about 0.1%
262 $(eval $(call check-gcc-var,-fmerge-all-constants))
263 $(eval $(call check-gcc-var,-fstrict-aliasing))
264 OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
266 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
267 GCC_VER := $(subst ., ,$(GCC_VER))
268 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
269 #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
271 ifeq ($(GCC_MAJOR_VER),4)
272 # shrinks code, results are from 4.0.2
274 $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
275 OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
277 $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
278 OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
280 $(eval $(call check-gcc-var,-fno-strength-reduce))
281 OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
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 # If -msoft-float isn't supported, we want an error anyway.
298 # Hmm... might need to revisit this for arm since it has 2 different
299 # soft float encodings.
300 ifneq ($(TARGET_ARCH),nios)
301 ifneq ($(TARGET_ARCH),nios2)
302 ifneq ($(TARGET_ARCH),sh)
303 ifneq ($(TARGET_ARCH),c6x)
304 CPU_CFLAGS-y += -msoft-float
309 ifeq ($(TARGET_ARCH),arm)
310 # No longer needed with current toolchains, but leave it here for now.
311 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
312 # LDADD_LIBFLOAT=-lfloat
316 $(eval $(call check-gcc-var,-std=gnu99))
317 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
319 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
320 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
322 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
323 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
326 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
327 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
328 PICFLAG := $(PICFLAG-y)
331 # Some nice CPU specific optimizations
332 ifeq ($(TARGET_ARCH),i386)
333 $(eval $(call check-gcc-var,-fomit-frame-pointer))
334 OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
336 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
337 # Non-SSE capable processor.
338 # NB: this may make SSE insns segfault!
339 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
340 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
341 # -m32 is needed if host is 64-bit
342 OPTIMIZATION+=$(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 ifeq ($(CONFIG_K7),y)
356 # Align functions to four bytes, use default for jumps and loops (why?)
357 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
359 ifeq ($(CONFIG_CRUSOE),y)
360 # Use compiler's default for functions, jumps and loops (why?)
361 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
363 ifeq ($(CONFIG_CYRIXIII),y)
364 # Use compiler's default for functions, jumps and loops (why?)
365 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
367 OPTIMIZATION+=$(GCC_FALIGN)
369 # Putting each function and data object into its own section
370 # allows for kbytes of less text if users link against static uclibc
371 # using ld --gc-sections.
372 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
373 # do not use --gc-sections at shared lib link time.
374 # However, in combination with sections being sorted by alignment
375 # it does result in much reduced padding:
376 # text data bss dec hex
377 # 235319 1472 5992 242783 3b45f old.so
378 # 234104 1472 5980 241556 3af94 new.so
379 # Without -ffunction-sections, all functions will get aligned
380 # to 4 byte boundary by as/ld. This is arguably a bug in as.
381 # It specifies 4 byte align for .text even if not told to do so:
382 # Idx Name Size VMA LMA File off Algn
383 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
384 CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
385 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
386 $(eval $(call check-ld-var,--sort-section=alignment))
387 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
391 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
392 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
393 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
394 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
395 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
396 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
397 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
398 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
399 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
400 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
401 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
402 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
403 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
404 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
405 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
406 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
409 ifeq ($(TARGET_ARCH),sparc)
410 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
411 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
412 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
413 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
416 ifeq ($(TARGET_ARCH),arm)
417 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
418 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
419 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
422 ifeq ($(TARGET_ARCH),metag)
424 CPU_CFLAGS-$(CONFIG_META_1_2)+=
425 CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
428 ifeq ($(TARGET_ARCH),mips)
429 OPTIMIZATION+=-mno-split-addresses
430 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
431 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
432 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
433 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
434 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
435 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
436 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
437 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
438 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
439 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
441 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
442 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
443 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
445 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
446 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
447 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
450 ifeq ($(TARGET_ARCH),nios)
451 OPTIMIZATION+=-funaligned-struct-hack
452 CPU_LDFLAGS-y+=-Wl,-m32
453 CPU_CFLAGS-y+=-Wl,-m32
456 ifeq ($(TARGET_ARCH),sh)
457 $(eval $(call check-gcc-var,-mprefergot))
458 OPTIMIZATION += $(CFLAG_-mprefergot)
459 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
460 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
461 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
462 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
463 ifeq ($(UCLIBC_HAS_FPU),y)
464 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
465 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
467 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
468 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
472 ifeq ($(TARGET_ARCH),sh64)
473 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
474 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
475 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
478 ifeq ($(TARGET_ARCH),h8300)
480 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
481 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
482 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
483 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
486 ifeq ($(TARGET_ARCH),i960)
487 OPTIMIZATION+=-mh -mint32 #-fsigned-char
490 ifeq ($(TARGET_ARCH),e1)
491 OPTIMIZATION+=-mgnu-param
494 ifeq ($(TARGET_ARCH),cris)
495 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
496 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
497 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
502 ifeq ($(TARGET_ARCH),m68k)
503 # -fPIC is only supported for 68020 and above. It is not supported
504 # for 68000, 68010, or Coldfire.
509 ifeq ($(TARGET_ARCH),powerpc)
510 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
511 # enough. Therefore use -fpic which will reduce code size and generates
515 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
516 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
517 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
521 ifeq ($(TARGET_ARCH),bfin)
523 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
524 CPU_CFLAGS-y:=-mfdpic
525 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
529 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
530 PICFLAG := -mleaf-id-shared-library
534 ifeq ($(TARGET_ARCH),frv)
535 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
536 # Using -pie causes the program to have an interpreter, which is
537 # forbidden, so we must make do with -shared. Unfortunately,
538 # -shared by itself would get us global function descriptors
539 # and calls through PLTs, dynamic resolution of symbols, etc,
540 # which would break as well, but -Bsymbolic comes to the rescue.
541 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
545 ifeq ($(strip $(TARGET_ARCH)),avr32)
546 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
547 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
548 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
551 ifeq ($(TARGET_ARCH),i960)
555 ifeq ($(TARGET_ARCH),v850)
559 ifeq ($(TARGET_ARCH),c6x)
561 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
562 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
563 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
564 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
565 CPU_LDFLAGS-y += $(CPU_CFLAGS)
568 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
569 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
571 PIEFLAG := $(PICFLAG)
573 # We need to keep track of both the CC PIE flag (above) as
574 # well as the LD PIE flag (below) because we can't rely on
575 # gcc passing -pie if we used -fPIE. We need to directly use -pie
576 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
577 $(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
579 # Check for --as-needed support in linker
580 ifndef LD_FLAG_ASNEEDED
581 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
582 ifneq ($(_LD_FLAG_ASNEEDED),)
583 export LD_FLAG_ASNEEDED:=--as-needed
586 ifndef LD_FLAG_NO_ASNEEDED
587 ifdef LD_FLAG_ASNEEDED
588 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
591 ifndef CC_FLAG_ASNEEDED
592 ifdef LD_FLAG_ASNEEDED
593 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
596 ifndef CC_FLAG_NO_ASNEEDED
597 ifdef LD_FLAG_NO_ASNEEDED
598 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
601 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
603 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
605 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
607 # Only used in installed libc.so linker script
608 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
609 ifeq ($(HARDWIRED_ABSPATH),y)
610 UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
612 UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
614 export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && \
615 echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
616 echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
618 export UBACKTRACE_ASNEEDED:=""
622 # Add a bunch of extra pedantic annoyingly strict checks
623 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
624 ifeq ($(EXTRA_WARNINGS),y)
628 -Wmissing-format-attribute \
629 -Wmissing-prototypes \
630 -Wmissing-declarations \
633 -Wold-style-declaration \
634 -Wold-style-definition \
637 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
638 WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
640 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
641 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
642 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
644 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
646 # Save the tested flag in a single variable and force it to be
647 # evaluated just once. Then use that computed value.
648 $(eval $(call check-gcc-var,-fno-stack-protector))
649 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
650 ifeq ($(UCLIBC_BUILD_SSP),y)
651 $(eval $(call check-gcc-var,-fno-stack-protector-all))
652 $(eval $(call check-gcc-var,-fstack-protector))
653 $(eval $(call check-gcc-var,-fstack-protector-all))
654 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
655 SSP_CFLAGS += $(CFLAG_-fstack-protector)
656 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
658 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
661 $(eval $(call check-gcc-var,-nostdlib))
663 # Collect all CFLAGS components
664 CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
665 -nostdinc -I$(top_builddir)include \
666 -I$(top_srcdir)include -include libc-symbols.h \
667 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
668 -I$(top_srcdir)libc/sysdeps/linux \
669 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
670 -I$(top_srcdir)ldso/include -I.
671 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
672 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
675 # We need this to be checked within libc-symbols.h
676 ifneq ($(HAVE_SHARED),y)
680 $(eval $(call check-ld-var,--warn-once))
681 $(eval $(call check-ld-var,--sort-common))
682 $(eval $(call check-ld-var,--discard-all))
683 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
684 -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
685 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
686 #$(eval $(call check-ld-var,--gc-sections))
687 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
689 $(eval $(call check-gcc-var,-fdata-sections))
690 $(eval $(call check-gcc-var,-ffunction-sections))
692 ifeq ($(UCLIBC_BUILD_RELRO),y)
693 LDFLAGS_NOSTRIP+=-Wl,-z,relro
696 ifeq ($(UCLIBC_BUILD_NOW),y)
697 LDFLAGS_NOSTRIP+=-Wl,-z,now
700 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
701 # Be sure that binutils support it
702 $(eval $(call check-ld-var,--hash-style=gnu))
703 ifeq ($(LDFLAG_--hash-style=gnu),)
704 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
705 $(error Your binutils do not support --hash-style option, while you want to use it)
708 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
712 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
714 CFLAGS += -O0 -g3 -DDEBUG
716 CFLAGS += $(OPTIMIZATION)
721 STRIPTOOL := true -Stripping_disabled
723 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
724 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
728 # we try to compile all sources at once into an object (IMA), but
729 # gcc-3.3.x does not support it
730 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
731 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
732 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
733 ifeq ($(GCC_MAJOR_VER),3)
736 $(eval $(call check-gcc-var,--combine))
737 CFLAGS += $(CFLAG_--combine)
743 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
744 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
747 ifeq ($(UCLIBC_HAS_THREADS),y)
748 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
750 CFLAGS += -DHAVE_FORCED_UNWIND
752 ifeq ($(LINUXTHREADS_OLD),y)
753 PTNAME := linuxthreads.old
755 PTNAME := linuxthreads
758 PTDIR := libpthread/$(PTNAME)
759 # set up system dependencies include dirs (NOTE: order matters!)
760 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
761 PTINC:= -I$(top_builddir)$(PTDIR) \
762 -I$(top_srcdir)$(PTDIR) \
763 $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
764 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
765 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
766 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
767 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
768 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
769 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
770 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
771 -I$(top_srcdir)$(PTDIR)/sysdeps/generic
773 # Test for TLS if NPTL support was selected.
775 GCC_HAS_TLS=$(shell \
776 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
777 ifneq ($(GCC_HAS_TLS),)
780 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
781 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
782 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
783 @echo "#### about this problem.";
785 @echo "#### Exiting...";
791 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
792 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
793 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
794 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
795 -I$(top_srcdir)$(PTDIR) \
796 -I$(top_srcdir)libpthread
803 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
805 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
806 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
807 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
810 CFLAGS += -I$(KERNEL_HEADERS)
812 ifneq ($(DOASSERTS),y)
816 ifeq ($(SYMBOL_PREFIX),_)
817 CFLAGS+=-D__UCLIBC_UNDERSCORES__
820 # Keep the check_as from being needlessly executed
821 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
822 $(eval $(call check-as-var,--noexecstack))
824 ASFLAGS = $(ASFLAG_--noexecstack)
826 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
827 $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
828 $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
829 # with -O0 we (e.g. lockf) might end up with references to
830 # _Unwind_Resume, so pull in gcc_eh in this case..
831 LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
832 LIBGCC_DIR:=$(dir $(LIBGCC))
834 # moved from libpthread/linuxthreads
835 ifeq ($(UCLIBC_CTOR_DTOR),y)
836 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
837 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
840 LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
842 PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"