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
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 ($(HAVE_SHARED),y)
161 ifeq ($(CROSS_COMPILE),)
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)
176 # Use variable indirection here so that we can have variable
177 # names with fun chars in them like equal signs
178 define check-tool-var
179 ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
182 $$(_v) := $$(call $(1),$(subst %, ,$(3)))
188 # Usage: check-gcc-var,<flag>
189 # Check the C compiler to see if it supports <flag>.
190 # Export the variable CFLAG_<flag> if it does.
192 $(call check-tool-var,check_gcc,CFLAG,$(1))
194 # Usage: check-as-var,<flag>
195 # Check the assembler to see if it supports <flag>. Export the
196 # variable ASFLAG_<flag> if it does (for invoking the assembler),
197 # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
199 $(call check-tool-var,check_as,ASFLAG,$(1))
201 export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
203 # Usage: check-ld-var,<flag>
204 # Check the linker to see if it supports <flag>. Export the
205 # variable LDFLAG_<flag> if it does (for invoking the linker),
206 # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
208 $(call check-tool-var,check_ld,LDFLAG,$(1))
210 export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
212 # Usage: cache-output-var,<variable>,<shell command>
213 # Execute <shell command> and cache the output in <variable>.
214 define cache-output-var
216 $(1) := $$(shell $(2))
225 # Flags in OPTIMIZATION are used only for non-debug builds
229 # Use '-Os' optimization if available, else use -O2, allow Config to override
230 $(eval $(call check-gcc-var,-Os))
231 ifneq ($(CFLAG_-Os),)
232 OPTIMIZATION += $(CFLAG_-Os)
234 $(eval $(call check-gcc-var,-O2))
235 OPTIMIZATION += $(CFLAG_-O2)
237 # Use the gcc 3.4 -funit-at-a-time optimization when available
238 $(eval $(call check-gcc-var,-funit-at-a-time))
239 OPTIMIZATION += $(CFLAG_-funit-at-a-time)
240 # shrinks code by about 0.1%
241 $(eval $(call check-gcc-var,-fmerge-all-constants))
242 $(eval $(call check-gcc-var,-fstrict-aliasing))
243 OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
245 $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
246 GCC_VER := $(subst ., ,$(GCC_VER))
247 GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
248 #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
250 ifeq ($(GCC_MAJOR_VER),4)
251 # shrinks code, results are from 4.0.2
253 $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
254 OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
256 $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
257 OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
259 $(eval $(call check-gcc-var,-fno-strength-reduce))
260 OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
265 # CPU_CFLAGS-y contain options which are not warnings,
266 # not include or library paths, and not optimizations.
268 # Why -funsigned-char: I hunted a bug related to incorrect
269 # sign extension of 'char' type for 10 hours straight. Not fun.
270 CPU_CFLAGS-y := -funsigned-char -fno-builtin
272 $(eval $(call check-gcc-var,-fno-asm))
273 CPU_CFLAGS-y += $(CFLAG_-fno-asm)
276 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
277 # If -msoft-float isn't supported, we want an error anyway.
278 # Hmm... might need to revisit this for arm since it has 2 different
279 # soft float encodings.
280 ifneq ($(TARGET_ARCH),nios)
281 ifneq ($(TARGET_ARCH),nios2)
282 ifneq ($(TARGET_ARCH),sh)
283 ifneq ($(TARGET_ARCH),c6x)
284 CPU_CFLAGS-y += -msoft-float
289 ifeq ($(TARGET_ARCH),arm)
290 # No longer needed with current toolchains, but leave it here for now.
291 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
292 # LDADD_LIBFLOAT=-lfloat
293 CPU_LDFLAGS-y += -msoft-float
297 $(eval $(call check-gcc-var,-std=gnu99))
298 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
300 CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
301 CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
303 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -mlittle-endian
304 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -mbig-endian
307 PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
308 PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
309 PICFLAG := $(PICFLAG-y)
312 # Some nice CPU specific optimizations
313 ifeq ($(TARGET_ARCH),i386)
314 $(eval $(call check-gcc-var,-fomit-frame-pointer))
315 OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
317 ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
318 # Non-SSE capable processor.
319 # NB: this may make SSE insns segfault!
320 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
321 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
322 # -m32 is needed if host is 64-bit
323 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
325 $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
326 OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
329 # Choice of alignment (please document why!)
330 # -falign-labels: in-line labels
331 # (reachable by normal code flow, aligning will insert nops
332 # which will be executed - may even make things slower)
333 # -falign-jumps: reachable only by a jump
334 # Generic: no alignment at all (smallest code)
335 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
336 ifeq ($(CONFIG_K7),y)
337 # Align functions to four bytes, use default for jumps and loops (why?)
338 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
340 ifeq ($(CONFIG_CRUSOE),y)
341 # Use compiler's default for functions, jumps and loops (why?)
342 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
344 ifeq ($(CONFIG_CYRIXIII),y)
345 # Use compiler's default for functions, jumps and loops (why?)
346 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
348 OPTIMIZATION+=$(GCC_FALIGN)
350 # Putting each function and data object into its own section
351 # allows for kbytes of less text if users link against static uclibc
352 # using ld --gc-sections.
353 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
354 # do not use --gc-sections at shared lib link time.
355 # However, in combination with sections being sorted by alignment
356 # it does result in much reduced padding:
357 # text data bss dec hex
358 # 235319 1472 5992 242783 3b45f old.so
359 # 234104 1472 5980 241556 3af94 new.so
360 # Without -ffunction-sections, all functions will get aligned
361 # to 4 byte boundary by as/ld. This is arguably a bug in as.
362 # It specifies 4 byte align for .text even if not told to do so:
363 # Idx Name Size VMA LMA File off Algn
364 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
365 CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
366 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
367 $(eval $(call check-ld-var,--sort-section=alignment))
368 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
372 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
373 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
374 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
375 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
376 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
377 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
378 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
379 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
380 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
381 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
382 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
383 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
384 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
385 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
386 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
387 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
390 ifeq ($(TARGET_ARCH),sparc)
391 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
392 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
393 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
394 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
397 ifeq ($(TARGET_ARCH),arm)
398 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
399 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
400 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
403 ifeq ($(TARGET_ARCH),mips)
404 OPTIMIZATION+=-mno-split-addresses
405 ifeq ($(findstring march,$(UCLIBC_EXTRA_CFLAGS)),)
406 # Some archs will optimize this, so allow overrides
407 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
408 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
409 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
410 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
411 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
412 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
413 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
415 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
416 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
417 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
419 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
420 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
421 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
423 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
424 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
425 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
428 ifeq ($(TARGET_ARCH),nios)
429 OPTIMIZATION+=-funaligned-struct-hack
430 CPU_LDFLAGS-y+=-Wl,-m32
431 CPU_CFLAGS-y+=-Wl,-m32
434 ifeq ($(TARGET_ARCH),sh)
435 $(eval $(call check-gcc-var,-mprefergot))
436 OPTIMIZATION += $(CFLAG_-mprefergot)
437 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
438 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
439 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
440 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
441 ifeq ($(UCLIBC_HAS_FPU),y)
442 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
443 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
445 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
446 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
450 ifeq ($(TARGET_ARCH),sh64)
451 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
452 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
453 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
456 ifeq ($(TARGET_ARCH),h8300)
458 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
459 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
460 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
461 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
464 ifeq ($(TARGET_ARCH),i960)
465 OPTIMIZATION+=-mh -mint32 #-fsigned-char
468 ifeq ($(TARGET_ARCH),e1)
469 OPTIMIZATION+=-mgnu-param
472 ifeq ($(TARGET_ARCH),cris)
473 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
474 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
475 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
480 ifeq ($(TARGET_ARCH),m68k)
481 # -fPIC is only supported for 68020 and above. It is not supported
482 # for 68000, 68010, or Coldfire.
483 ifeq ($(UCLIBC_FORMAT_FLAT),y)
492 ifeq ($(TARGET_ARCH),powerpc)
493 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
494 # enough. Therefore use -fpic which will reduce code size and generates
498 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
499 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
500 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
504 ifeq ($(TARGET_ARCH),bfin)
506 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
507 CPU_CFLAGS-y:=-mfdpic
508 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
512 ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
513 PICFLAG := -mleaf-id-shared-library
517 ifeq ($(TARGET_ARCH),frv)
518 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
519 # Using -pie causes the program to have an interpreter, which is
520 # forbidden, so we must make do with -shared. Unfortunately,
521 # -shared by itself would get us global function descriptors
522 # and calls through PLTs, dynamic resolution of symbols, etc,
523 # which would break as well, but -Bsymbolic comes to the rescue.
524 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
528 ifeq ($(strip $(TARGET_ARCH)),avr32)
529 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
530 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
531 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
534 ifeq ($(TARGET_ARCH),i960)
538 ifeq ($(TARGET_ARCH),v850)
542 ifeq ($(TARGET_ARCH),c6x)
544 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
545 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
546 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
547 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
548 CPU_LDFLAGS-y += $(CPU_CFLAGS)
551 $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
552 PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
554 PIEFLAG := $(PICFLAG)
556 # We need to keep track of both the CC PIE flag (above) as
557 # well as the LD PIE flag (below) because we can't rely on
558 # gcc passing -pie if we used -fPIE. We need to directly use -pie
559 # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
560 $(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
562 # Check for --as-needed support in linker
563 ifndef LD_FLAG_ASNEEDED
564 _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
565 ifneq ($(_LD_FLAG_ASNEEDED),)
566 export LD_FLAG_ASNEEDED:=--as-needed
569 ifndef LD_FLAG_NO_ASNEEDED
570 ifdef LD_FLAG_ASNEEDED
571 export LD_FLAG_NO_ASNEEDED:=--no-as-needed
574 ifndef CC_FLAG_ASNEEDED
575 ifdef LD_FLAG_ASNEEDED
576 export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
579 ifndef CC_FLAG_NO_ASNEEDED
580 ifdef LD_FLAG_NO_ASNEEDED
581 export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
584 link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
586 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
588 export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
589 ifeq ($(UCLIBC_HAS_BACKTRACE),y)
590 # Only used in installed libc.so linker script
591 UBACKTRACE_FULL_NAME := $(RUNTIME_PREFIX)lib/$(UBACKTRACE_DSO)
592 export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UBACKTRACE_FULL_NAME) )" || echo "$(UBACKTRACE_FULL_NAME)")
594 export UBACKTRACE_ASNEEDED:=""
598 # Add a bunch of extra pedantic annoyingly strict checks
599 WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
600 ifeq ($(EXTRA_WARNINGS),y)
604 -Wmissing-format-attribute \
605 -Wmissing-prototypes \
606 -Wmissing-declarations \
609 -Wold-style-declaration \
610 -Wold-style-definition \
613 # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
614 WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
616 WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
617 $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
618 XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
620 CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
622 # Save the tested flag in a single variable and force it to be
623 # evaluated just once. Then use that computed value.
624 $(eval $(call check-gcc-var,-fno-stack-protector))
625 SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
626 ifeq ($(UCLIBC_BUILD_SSP),y)
627 $(eval $(call check-gcc-var,-fno-stack-protector-all))
628 $(eval $(call check-gcc-var,-fstack-protector))
629 $(eval $(call check-gcc-var,-fstack-protector-all))
630 SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
631 SSP_CFLAGS += $(CFLAG_-fstack-protector)
632 SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
634 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
637 $(eval $(call check-gcc-var,-nostdlib))
639 # Collect all CFLAGS components
640 CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
641 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
642 -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
643 -I$(top_srcdir)libc/sysdeps/linux \
644 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
646 # We need this to be checked within libc-symbols.h
647 ifneq ($(HAVE_SHARED),y)
651 $(eval $(call check-ld-var,--warn-once))
652 $(eval $(call check-ld-var,--sort-common))
653 $(eval $(call check-ld-var,--discard-all))
654 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
655 -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
656 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
657 #$(eval $(call check-ld-var,--gc-sections))
658 #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
660 $(eval $(call check-gcc-var,-fdata-sections))
661 $(eval $(call check-gcc-var,-ffunction-sections))
663 ifeq ($(UCLIBC_BUILD_RELRO),y)
664 LDFLAGS_NOSTRIP+=-Wl,-z,relro
667 ifeq ($(UCLIBC_BUILD_NOW),y)
668 LDFLAGS_NOSTRIP+=-Wl,-z,now
671 ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
672 # Be sure that binutils support it
673 $(eval $(call check-ld-var,--hash-style=gnu))
674 ifeq ($(LDFLAG_--hash-style=gnu),)
675 ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
676 $(error Your binutils do not support --hash-style option, while you want to use it)
679 LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
683 LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
685 CFLAGS += -O0 -g3 -DDEBUG
687 CFLAGS += $(OPTIMIZATION)
692 STRIPTOOL ?= true -Stripping_disabled
694 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
695 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
699 # we try to compile all sources at once into an object (IMA), but
700 # gcc-3.3.x does not support it
701 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
702 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
703 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
704 ifeq ($(GCC_MAJOR_VER),3)
707 $(eval $(call check-gcc-var,--combine))
708 CFLAGS += $(CFLAG_--combine)
714 ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
715 LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
718 ifeq ($(UCLIBC_HAS_THREADS),y)
719 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
721 CFLAGS += -DHAVE_FORCED_UNWIND
723 ifeq ($(LINUXTHREADS_OLD),y)
724 PTNAME := linuxthreads.old
726 PTNAME := linuxthreads
729 PTDIR := libpthread/$(PTNAME)
730 # set up system dependencies include dirs (NOTE: order matters!)
731 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
732 PTINC:= -I$(top_builddir)$(PTDIR) \
733 -I$(top_srcdir)$(PTDIR) \
734 $(if $(TARGET_ARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
735 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
736 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
737 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
738 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
739 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
740 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
741 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
742 -I$(top_srcdir)$(PTDIR)/sysdeps/generic \
743 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
744 -I$(top_srcdir)ldso/include
746 # Test for TLS if NPTL support was selected.
748 GCC_HAS_TLS=$(shell \
749 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
750 ifneq ($(GCC_HAS_TLS),)
753 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
754 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
755 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
756 @echo "#### about this problem.";
758 @echo "#### Exiting...";
764 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
765 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
766 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
767 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
768 -I$(top_srcdir)$(PTDIR) \
769 -I$(top_srcdir)libpthread
776 CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
777 CFLAGS += -I$(KERNEL_HEADERS)
779 #CFLAGS += -iwithprefix include-fixed -iwithprefix include
780 $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
781 CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
784 ifneq ($(DOASSERTS),y)
788 ifeq ($(SYMBOL_PREFIX),_)
789 CFLAGS+=-D__UCLIBC_UNDERSCORES__
792 # Keep the check_as from being needlessly executed
793 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
794 $(eval $(call check-as-var,--noexecstack))
796 ASFLAGS = $(ASFLAG_--noexecstack)
798 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
799 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name || echo)
800 LIBGCC_DIR:=$(dir $(LIBGCC))
802 LDSOGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -v -Wl,-verbose 2>&1 | sed -n 's/.*-dynamic-linker *\([^ ]*\) .*$$/\1/p')
804 # moved from libpthread/linuxthreads
805 ifeq ($(UCLIBC_CTOR_DTOR),y)
806 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
807 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
810 ########################################
812 # uClinux shared lib support
815 ifeq ($(CONFIG_BINFMT_SHARED_FLAT),y)
816 ifndef DISABLE_SHARED_LIBS
817 # For the shared version of this, we specify no stack and its library ID
820 export LIBID FLTFLAGS
821 SHARED_TARGET = lib/libc
825 LOCAL_INSTALL_PATH := install_dir