summaryrefslogtreecommitdiff
path: root/Rules.mak
blob: e56878d806c002c55e944790addaf263d67c3694 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
# Rules.mak for uClibc-ng
#
# Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
# Copyright (C) 2015-2024 Waldemar Brodkorb <wbx@uclibc-ng.org>
#
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#

# make nano-doc
# FOO = bar  -- recursively expanded variable. Value is remebered verbatim.
#               If it contains references to other variables, these references
#               are expanded whenever this variable is _substituted_.
# FOO := bar -- simply expanded variable. Right hand is expanded when
#               the variable is _defined_. Therefore faster than =.
# FOO ?= bar -- set a value only if it is not already set
#               (behaves as =, not :=).
# FOO += bar -- append; if FOO is not defined, acts like = (not :=).


# check for proper make version
ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
endif

#-----------------------------------------------------------
# This file contains rules which are shared between multiple
# Makefiles.  All normal configuration options live in the
# file named ".config".  Don't mess with this file unless
# you know what you are doing.

clean_targets := clean realclean distclean \
	objclean-y headers_clean-y CLEAN_utils
noconfig_targets := menuconfig config nconfig \
	oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
	alldefconfig randconfig defconfig savedefconfig listnewconfig \
	olddefconfig \
	xconfig gconfig update-po-config mconf qconf gconf nconf conf \
	release dist tags help


#-----------------------------------------------------------
# If you are running a cross compiler, you will want to set
# 'CROSS_COMPILE' to something more interesting ...  Target
# architecture is determined by asking the CC compiler what
# arch it compiles things for, so unless your compiler is
# broken, you should not need to specify TARGET_ARCH.
#
# Most people will set this stuff on the command line, i.e.
#        make CROSS_COMPILE=arm-linux-
# will build uClibc-ng for 'arm'.
# CROSS is still supported for backward compatibily only

CROSS_COMPILE ?= $(CROSS)

CC         = $(CROSS_COMPILE)gcc
AR         = $(CROSS_COMPILE)ar
LD         = $(CROSS_COMPILE)ld
NM         = $(CROSS_COMPILE)nm
OBJDUMP    = $(CROSS_COMPILE)objdump
STRIPTOOL  = $(CROSS_COMPILE)strip

INSTALL    = install
LN         = ln
RM         = rm -f
TAR        = tar
SED        = sed
AWK        = awk

STRIP_FLAGS ?= -x -R .note -R .comment

# Select the compiler needed to build binaries for your development system
HOSTCC     = gcc
BUILD_CFLAGS = -Os

#---------------------------------------------------------
# Nothing beyond this point should ever be touched by mere
# mortals.  Unless you hang out with the gods, you should
# probably leave all this stuff alone.

# strip quotes
qstrip = $(strip $(subst ",,$(1)))
#"))

# kconfig stuff
KCONFIG_CONFIG ?= $(top_builddir).config
KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
export KCONFIG_CONFIG
KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
export KCONFIG_AUTOCONFIG
KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
export KCONFIG_TRISTATE
srctree := $(abspath $(top_srcdir))
export srctree
KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
export KCONFIG_AUTOHEADER
Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)

# Pull in the user's uClibc-ng configuration
ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
-include $(KCONFIG_CONFIG)
endif

TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
ifeq ($(TARGET_ARCH),)
ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
				  -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
				  -e s/nds32.*/nds32/ \
				  -e s/sh.*/sh/ \
				  -e s/s390x/s390/ -e s/parisc.*/hppa/ \
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
				  -e s/xtensa.*/xtensa/ )
else
ARCH = $(TARGET_ARCH)
endif
export ARCH

# Make certain these contain a final "/", but no "//"s.
scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
DEVEL_PREFIX   := $(call scrub_path,$(DEVEL_PREFIX))
MULTILIB_DIR   := $(call scrub_path,$(MULTILIB_DIR))
KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR


# Now config hard core
MAJOR_VERSION := 1
MINOR_VERSION := 0
SUBLEVEL      := 49
EXTRAVERSION  :=
VERSION       := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
ABI_VERSION   := $(MAJOR_VERSION)
ifneq ($(EXTRAVERSION),)
VERSION       := $(VERSION)$(EXTRAVERSION)
endif
# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
LC_ALL := C
export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL

LIBC := libc
SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)

UCLIBC_LDSO_NAME := $(call qstrip,$(TARGET_LDSO_NAME))
ARCH_NATIVE_BIT := $(call qstrip,$(TARGET_ARCH_BITS))

UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
NONSHARED_LIBNAME := uclibc_nonshared.a
NONSHARED_LIBPTHREAD := libpthread_nonshared.a

libc := $(top_builddir)lib/$(SHARED_LIBNAME)
libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
interp := $(top_builddir)lib/interp.os
ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
headers_dep := $(top_builddir)include/bits/sysnum.h \
	$(top_builddir)include/bits/uClibc_config.h
sub_headers := $(headers_dep)

LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)

# Make sure DESTDIR and PREFIX can be used to install
# PREFIX is a uClibcism while DESTDIR is a common GNUism
ifndef PREFIX
PREFIX = $(DESTDIR)
endif

ifneq ($(HAVE_SHARED),y)
libc :=
endif
ifneq ($(HAVE_LDSO),y)
interp :=
ldso :=
endif

comma:=,
space:= #

ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
endif

# A nifty macro to make testing gcc features easier
check_gcc=$(shell \
	tf="/tmp/cgccucl$$$$.o"; \
	if $(CC) $(1) -S -o $$tf -xc /dev/null > /dev/null 2>&1; \
	then echo "$(1)"; else echo "$(2)"; fi; rm -f $$tf )
check_as=$(shell \
	tf="/tmp/casucl$$$$.o"; \
	if $(CC) -Wa,$(1) -Wa,-Z -c -o $$tf -xassembler /dev/null > /dev/null 2>&1; \
	then echo "-Wa,$(1)"; fi; rm -f $$tf )
check_ld=$(shell \
	tf="/tmp/clducl$$$$.c"; echo "int _start(){return 0;}int main(){return 0;}" >$$tf; \
	if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null $$tf > /dev/null 2>&1; \
	then echo "$(1)"; fi; rm -f $$tf )

# Use variable indirection here so that we can have variable
# names with fun chars in them like equal signs
define check-tool-var
ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
_v = $(2)_$(3)
ifndef $$(_v)
$$(_v) := $$(call $(1),$(subst %, ,$(3)))
export $$(_v)
endif
endif
endef

# Usage: check-gcc-var,<flag>
# Check the C compiler to see if it supports <flag>.
# Export the variable CFLAG_<flag> if it does.
define check-gcc-var
$(call check-tool-var,check_gcc,CFLAG,$(1))
endef
# Usage: check-as-var,<flag>
# Check the assembler to see if it supports <flag>.  Export the
# variable ASFLAG_<flag> if it does (for invoking the assembler),
# as well CFLAG_-Wa<flag> (for invoking the compiler driver).
define check-as-var
$(call check-tool-var,check_as,ASFLAG,$(1))
_v = CFLAG_-Wa$(1)
export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
endef
# Usage: check-ld-var,<flag>
# Check the linker to see if it supports <flag>.  Export the
# variable LDFLAG_<flag> if it does (for invoking the linker),
# as well CFLAG_-Wl<flag> (for invoking the compiler driver).
define check-ld-var
$(call check-tool-var,check_ld,LDFLAG,$(1))
_v = CFLAG_-Wl$(1)
export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
endef
# Usage: cache-output-var,<variable>,<shell command>
# Execute <shell command> and cache the output in <variable>.
define cache-output-var
ifndef $(1)
$(1) := $$(shell $(2))
export $(1)
endif
endef


ARFLAGS:=cr

# Note: The check for -nostdlib has to be before all calls to check_ld
$(eval $(call check-gcc-var,-nostdlib))
$(eval $(call check-gcc-var,-nostartfiles))
# deliberately not named CFLAG-fuse-ld since unchecked and from user
LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
# failed to merge target specific data of file /dev/null
# Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
$(eval $(call check-ld-var,--no-warn-mismatch))

$(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
GCC_VER := $(subst ., ,$(GCC_VER))
GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
GCC_MINOR_VER ?= $(word 2,$(GCC_VER))

# Flags in OPTIMIZATION are used only for non-debug builds

OPTIMIZATION:=
OPTIMIZATION-$(GCC_MAJOR_VER):=
OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=

# Use '-Os' optimization if available, else use -O2, allow Config to override
$(eval $(call check-gcc-var,-Os))
ifneq ($(CFLAG_-Os),)
OPTIMIZATION += $(CFLAG_-Os)
else
$(eval $(call check-gcc-var,-O2))
OPTIMIZATION += $(CFLAG_-O2)
endif
# Use the gcc 3.4 -funit-at-a-time optimization when available
$(eval $(call check-gcc-var,-funit-at-a-time))
OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
$(eval $(call check-gcc-var,-fstrict-aliasing))
OPTIMIZATION += $(CFLAG_-fstrict-aliasing)

# CPU_CFLAGS-y contain options which are not warnings,
# not include or library paths, and not optimizations.

# Why -funsigned-char: I hunted a bug related to incorrect
# sign extension of 'char' type for 10 hours straight. Not fun.
CPU_CFLAGS-y := -funsigned-char -fno-builtin -fcommon

$(eval $(call check-gcc-var,-fno-asm))
CPU_CFLAGS-y += $(CFLAG_-fno-asm)
$(eval $(call check-gcc-var,-fmerge-all-constants))
CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)

ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
ifneq ($(TARGET_ARCH),bfin)
ifneq ($(TARGET_ARCH),lm32)
ifneq ($(TARGET_ARCH),nios2)
ifneq ($(TARGET_ARCH),nds32)
ifneq ($(TARGET_ARCH),sh)
ifneq ($(TARGET_ARCH),c6x)
ifneq ($(TARGET_ARCH),h8300)
ifneq ($(TARGET_ARCH),arc)
ifneq ($(TARGET_ARCH),aarch64)
ifneq ($(TARGET_ARCH),riscv32)
CPU_CFLAGS-y += -msoft-float
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif

ifeq ($(TARGET_ARCH),aarch64)
CPU_CFLAGS-y += -ftls-model=initial-exec
endif

$(eval $(call check-gcc-var,-std=gnu99))
CPU_CFLAGS-y += $(CFLAG_-std=gnu99)

CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data

CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)    += -Wl,-EB

PICFLAG-y := -fPIC
PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF)  := -mdsbt -fpic
PICFLAG := $(PICFLAG-y)
PIEFLAG_NAME:=-fPIE

$(eval $(call check-gcc-var,-fdata-sections))
$(eval $(call check-gcc-var,-ffunction-sections))

# Some nice CPU specific optimizations
ifeq ($(TARGET_ARCH),i386)

ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
	# TODO: Change this to a gcc version check.  This bug
	# should be fixed with at least gcc-4.3.
	# Non-SSE capable processor.
	# NB: this may make SSE insns segfault!
	# -O1 -march=pentium3, -Os -msse etc are known to be affected.
	# See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
	# -m32 is needed if host is 64-bit
	OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
else
$(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
	OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
endif

	# Choice of alignment (please document why!)
	#  -falign-labels: in-line labels
	#  (reachable by normal code flow, aligning will insert nops
	#  which will be executed - may even make things slower)
	#  -falign-jumps: reachable only by a jump
	# Generic: no alignment at all (smallest code)
	GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
	OPTIMIZATION+=$(GCC_FALIGN)

	# Putting each function and data object into its own section
	# allows for kbytes of less text if users link against static uclibc
	# using ld --gc-sections.
	# ld 2.18 can't do that (yet?) for shared libraries, so we itself
	# do not use --gc-sections at shared lib link time.
	# However, in combination with sections being sorted by alignment
	# it does result in much reduced padding:
	#   text    data     bss     dec     hex
	# 235319    1472    5992  242783   3b45f old.so
	# 234104    1472    5980  241556   3af94 new.so
	# Without -ffunction-sections, all functions will get aligned
	# to 4 byte boundary by as/ld. This is arguably a bug in as.
	# It specifies 4 byte align for .text even if not told to do so:
	# Idx Name          Size      VMA       LMA       File off  Algn
	#   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
	CPU_CFLAGS-y  += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
	CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
$(eval $(call check-ld-var,--sort-section=alignment))
	CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)

	CPU_LDFLAGS-y+=-m32
	CPU_CFLAGS-y+=-m32
endif

ifeq ($(TARGET_ARCH),sparc)
	CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
	CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
	CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
	CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
endif

ifeq ($(TARGET_ARCH),arm)
	CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
	CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
endif

ifeq ($(TARGET_ARCH),metag)
        SYMBOL_PREFIX=_
        CPU_CFLAGS-$(CONFIG_META_1_2)+=
        CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
endif

ifeq ($(TARGET_ARCH),mips)
	OPTIMIZATION+=-mno-split-addresses
	CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
	CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
	CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
	CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
	CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
	CPU_LDFLAGS-y += $(CPU_CFLAGS)
endif

ifeq ($(TARGET_ARCH),nds32)
	CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
	CFLAGS-.os+= -DPIC
	CFLAGS-.oS+= -DPIC
endif

ifeq ($(TARGET_ARCH),sh)
$(eval $(call check-gcc-var,-mprefergot))
	OPTIMIZATION += $(CFLAG_-mprefergot)
	CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
	CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
	CPU_CFLAGS-$(CONFIG_SH2)+=-m2
	CPU_CFLAGS-$(CONFIG_SH3)+=-m3
ifeq ($(UCLIBC_HAS_FPU),y)
	CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
	CPU_CFLAGS-$(CONFIG_SH4)+=-m4
	CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
else
	CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
	CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
	CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
endif
endif

ifeq ($(TARGET_ARCH),h8300)
	CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
	CPU_CFLAGS-$(CONFIG_H8S)    += -ms -mint32
endif

ifeq ($(TARGET_ARCH),cris)
	CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
	CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
	CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
	PICFLAG:=-fpic
	PIEFLAG_NAME:=-fpie
endif

ifeq ($(TARGET_ARCH),csky)
	# In csky gas implement, we use $t and $d to detect .text or literal pool.
	# So we couldn't strip them for objdump.
	STRIP_FLAGS += -K "$$"t -K "$$"d

	CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)	+= -mlittle-endian
	CPU_CFLAGS-$(ARCH_BIG_ENDIAN)		+= -mbig-endian
endif

ifeq ($(TARGET_ARCH),kvx)
	CPU_CFLAGS-y += -march=$(call qstrip,$(TARGET_MARCH))
	CPU_LDFLAGS-y += -march=$(call qstrip,$(TARGET_MARCH))
endif

ifeq ($(TARGET_ARCH),m68k)
	# -fPIC is only supported for 68020 and above.  It is not supported
	# for 68000, 68010, or Coldfire.
	PICFLAG:=-fpic
	PIEFLAG_NAME:=-fpie
endif

ifeq ($(TARGET_ARCH),powerpc)
# PowerPC can hold 8192 entries in its GOT with -fpic which is more than
# enough. Therefore use -fpic which will reduce code size and generates
# faster code.
	PICFLAG:=-fpic
	PIEFLAG_NAME:=-fpie
	PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null -  2> /dev/null && echo -n y || echo -n n)
	PPC_HAS_SECUREPLT:=$(shell $(CC) --verbose 2>&1 | grep -- --enable-secureplt > /dev/null && echo -n y || echo -n n)
	CPU_CFLAGS-$(PPC_HAS_SECUREPLT) += -DPPC_HAS_SECUREPLT
	CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
	CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
endif

ifeq ($(TARGET_ARCH),bfin)
	SYMBOL_PREFIX=_
ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
	CPU_CFLAGS-y:=-mfdpic
	CPU_LDFLAGS-y += -Wl,-melf32bfinfd
	PICFLAG:=-fpic
	PIEFLAG_NAME:=-fpie
endif
ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
	PICFLAG := -mleaf-id-shared-library
endif
endif

ifeq ($(TARGET_ARCH),frv)
	# Using -pie causes the program to have an interpreter, which is
	# forbidden, so we must make do with -shared.  Unfortunately,
	# -shared by itself would get us global function descriptors
	# and calls through PLTs, dynamic resolution of symbols, etc,
	# which would break as well, but -Bsymbolic comes to the rescue.
	CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
endif

ifeq ($(strip $(TARGET_ARCH)),avr32)
       CPU_CFLAGS-$(CONFIG_AVR32_AP7)  += -march=ap
       CPU_CFLAGS-$(CONFIG_LINKRELAX)  += -mrelax
       CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
endif

ifeq ($(TARGET_ARCH),c6x)
	PIEFLAG:=
	CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
	CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
	CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
	CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
	CPU_LDFLAGS-y += $(CPU_CFLAGS)
endif

ifeq ($(TARGET_ARCH),xtensa)
	CPU_CFLAGS-$(UCLIBC_FORMAT_FDPIC_ELF) += -mfdpic
endif

$(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
ifeq ($(PIEFLAG),)
PIEFLAG := $(PICFLAG)
endif
# We need to keep track of both the CC PIE flag (above) as
# well as the LD PIE flag (below) because we can't rely on
# gcc passing -pie if we used -fPIE. We need to directly use -pie
# instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
$(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))

# Check for --as-needed support in linker
ifndef LD_FLAG_ASNEEDED
_LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
ifneq ($(_LD_FLAG_ASNEEDED),)
export LD_FLAG_ASNEEDED:=--as-needed
endif
endif
ifndef LD_FLAG_NO_ASNEEDED
ifdef LD_FLAG_ASNEEDED
export LD_FLAG_NO_ASNEEDED:=--no-as-needed
endif
endif
ifndef CC_FLAG_ASNEEDED
ifdef LD_FLAG_ASNEEDED
export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
endif
endif
ifndef CC_FLAG_NO_ASNEEDED
ifdef LD_FLAG_NO_ASNEEDED
export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
endif
endif
link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))

# Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
ifndef ASNEEDED
export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
endif

# Add a bunch of extra pedantic annoyingly strict checks
WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing -Wno-nonnull-compare
ifeq ($(EXTRA_WARNINGS),y)
WARNING_FLAGS += \
	-Wnonnull-compare \
	-Wnodeclaration-after-statement \
	-Wformat=2 \
	-Wmissing-noreturn \
	-Wmissing-format-attribute \
	-Wmissing-prototypes \
	-Wmissing-declarations \
	-Wnested-externs \
	-Wnonnull \
	-Wold-style-declaration \
	-Wold-style-definition \
	-Wshadow \
	-Wundef
endif
WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
$(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))

CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))

# Save the tested flag in a single variable and force it to be
# evaluated just once.  Then use that computed value.
$(eval $(call check-gcc-var,-fno-stack-protector))
SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
ifeq ($(UCLIBC_BUILD_SSP),y)
$(eval $(call check-gcc-var,-fno-stack-protector-all))
$(eval $(call check-gcc-var,-fstack-protector))
$(eval $(call check-gcc-var,-fstack-protector-all))
SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
SSP_CFLAGS += $(CFLAG_-fstack-protector)
SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
else
SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
endif

# Collect all CFLAGS components
CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
	-nostdinc -I$(top_builddir)include \
	-I$(top_srcdir)include -include libc-symbols.h \
	-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
	-I$(top_builddir)libc/sysdeps/linux/$(TARGET_ARCH) \
	-I$(top_srcdir)libc/sysdeps/linux \
	-I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
	-I$(top_srcdir)ldso/include -I.

# We need this to be checked within libc-symbols.h
ifneq ($(HAVE_SHARED),y)
CFLAGS += -DSTATIC
endif

$(eval $(call check-ld-var,--warn-once))
$(eval $(call check-ld-var,--sort-common))
$(eval $(call check-ld-var,--discard-all))
LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
	-Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc

ifeq ($(UCLIBC_BUILD_RELRO),y)
LDFLAGS_NOSTRIP+=-Wl,-z,relro
endif

ifeq ($(UCLIBC_BUILD_NOW),y)
LDFLAGS_NOSTRIP+=-Wl,-z,now
endif

ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
# Be sure that binutils support it
$(eval $(call check-ld-var,--hash-style=gnu))
ifeq ($(LDFLAG_--hash-style=gnu),)
ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
$(error Your binutils do not support --hash-style option, while you want to use it)
endif
else
LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
endif
endif

ifeq ($(DODEBUG),y)
CFLAGS += -O0 -g3 -DDEBUG
else
CFLAGS += $(OPTIMIZATION)
CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
$(eval $(call check-ld-var,-O2))
LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
endif

LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs

ifeq ($(DOSTRIP),y)
LDFLAGS += -Wl,-s
else
STRIPTOOL := true -Stripping_disabled
endif

ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
endif
ifeq ($(TARGET_ARCH),i386)
CFLAGS += -fno-omit-frame-pointer
endif
ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
endif

ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
CFLAGS += -D__USE_STDIO_FUTEXES__
endif

ifeq ($(UCLIBC_USE_TIME64),y)
CFLAGS += -D__UCLIBC_HAVE_STATX__
endif

ifeq ($(UCLIBC_HAS_THREADS),y)
ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
	PTNAME := nptl
	CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
else
ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
	PTNAME := linuxthreads
endif
endif
PTDIR := libpthread/$(PTNAME)
# set up system dependencies include dirs (NOTE: order matters!)
ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
PTINC:= -I$(top_builddir)$(PTDIR)					\
	-I$(top_srcdir)$(PTDIR)						\
	$(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
	-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)	\
	-I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH)		\
	-I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH)			\
	-I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux		\
	-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux			\
	-I$(top_srcdir)$(PTDIR)/sysdeps/pthread				\
	-I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits			\
	-I$(top_srcdir)$(PTDIR)/sysdeps/generic
#
# Test for TLS if NPTL support was selected.
#
GCC_HAS_TLS=$(shell \
	echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
ifneq ($(GCC_HAS_TLS),)
gcc_tls_test_fail:
	@echo "####";
	@echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
	@echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
	@echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
	@echo "#### about this problem.";
	@echo "####";
	@echo "#### Exiting...";
	@echo "####";
	@exit 1;
endif
else
PTINC := \
	-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
	-I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
	-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
	-I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
	-I$(top_srcdir)$(PTDIR) \
	-I$(top_srcdir)libpthread
endif
CFLAGS+=$(PTINC)
else
	PTNAME :=
	PTINC  :=
endif
CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common

#CFLAGS += -iwithprefix include-fixed -iwithprefix include
$(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
CFLAGS += $(CC_INC)

CFLAGS += -I$(KERNEL_HEADERS)

ifneq ($(DOASSERTS),y)
CFLAGS+=-DNDEBUG
endif

ifeq ($(SYMBOL_PREFIX),_)
CFLAGS+=-D__UCLIBC_UNDERSCORES__
endif

# Keep the check_as from being needlessly executed
ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
$(eval $(call check-as-var,--noexecstack))
endif
ASFLAGS += $(ASFLAG_--noexecstack)

LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
$(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
$(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
# with -O0 we (e.g. lockf) might end up with references to
# _Unwind_Resume, so pull in gcc_eh in this case..
# with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
# in libgcc.a, so check if the printed file exist, before adding to the commandline
LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
LIBGCC_DIR := $(dir $(LIBGCC_A))
LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))

# moved from libpthread/linuxthreads
ifeq ($(UCLIBC_CTOR_DTOR),y)
SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
endif

LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir

PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"