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lh9ed821d2023-04-07 01:36:19 -07001# Rules.make for uClibc
2#
3# Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
4#
5# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
6#
7
8# make nano-doc
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 :=).
17
18
19# check for proper make version
20ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
21$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
22endif
23
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.
29
30
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.
37#
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
42
43CROSS_COMPILE ?= $(CROSS)
44
45CC = $(CROSS_COMPILE)gcc
46AR = $(CROSS_COMPILE)ar
47LD = $(CROSS_COMPILE)ld
48NM = $(CROSS_COMPILE)nm
49OBJDUMP = $(CROSS_COMPILE)objdump
50STRIPTOOL = $(CROSS_COMPILE)strip
51
52INSTALL = install
53LN = ln
54RM = rm -f
55TAR = tar
56SED = sed
57AWK = awk
58
59STRIP_FLAGS ?= -x -R .note -R .comment
60
61## unused? if yes, remove after 0.9.31
62## UNIFDEF := $(top_builddir)extra/scripts/unifdef
63
64# Select the compiler needed to build binaries for your development system
65HOSTCC = gcc
66BUILD_CFLAGS = -Os -Wall
67
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.
72
73# strip quotes
74qstrip = $(strip $(subst ",,$(1)))
75#"))
76
77# Pull in the user's uClibc configuration
78ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
79-include $(top_builddir).config
80endif
81TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
82ifeq ($(TARGET_ARCH),)
83ARCH ?= $(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/ \
86 -e s/sh.*/sh/ \
87 -e s/s390x/s390/ -e s/parisc.*/hppa/ \
88 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
89 -e s/xtensa.*/xtensa/ )
90else
91ARCH = $(TARGET_ARCH)
92endif
93export ARCH
94
95# Make certain these contain a final "/", but no "//"s.
96TARGET_SUBARCH:=$(call qstrip,$(TARGET_SUBARCH))
97RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(RUNTIME_PREFIX)))))
98DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(DEVEL_PREFIX)))))
99MULTILIB_DIR:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(MULTILIB_DIR)))))
100KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(KERNEL_HEADERS)))))
101export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
102
103
104# Now config hard core
105MAJOR_VERSION := 0
106MINOR_VERSION := 9
107SUBLEVEL := 33
108EXTRAVERSION :=.2
109VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
110ABI_VERSION := $(MAJOR_VERSION)
111ifneq ($(EXTRAVERSION),)
112VERSION := $(VERSION)$(EXTRAVERSION)
113endif
114# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
115LC_ALL := C
116export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
117
118LIBC := libc
119SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
120UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
121ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
122UCLIBC_LDSO_NAME := ld64-uClibc
123ARCH_NATIVE_BIT := 64
124else
125UCLIBC_LDSO_NAME := ld-uClibc
126ARCH_NATIVE_BIT := 32
127endif
128UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
129NONSHARED_LIBNAME := uclibc_nonshared.a
130libc := $(top_builddir)lib/$(SHARED_LIBNAME)
131libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
132ifneq ($(ARCH_HAS_NO_SHARED),y)
133libdl.depend := $(top_builddir)lib/libdl.so
134endif
135ifneq ($(HAS_NO_THREADS),y)
136libpthread.depend := $(top_builddir)lib/libpthread.so
137endif
138interp := $(top_builddir)lib/interp.os
139ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
140headers_dep := $(top_builddir)include/bits/sysnum.h
141sub_headers := $(headers_dep)
142
143#LIBS :=$(interp) -L$(top_builddir)lib -lc
144LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
145
146# Make sure DESTDIR and PREFIX can be used to install
147# PREFIX is a uClibcism while DESTDIR is a common GNUism
148ifndef PREFIX
149PREFIX = $(DESTDIR)
150endif
151
152ifneq ($(HAVE_SHARED),y)
153libc :=
154interp :=
155ldso :=
156endif
157
158comma:=,
159space:= #
160
161ifeq ($(CROSS_COMPILE),)
162CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
163endif
164
165# A nifty macro to make testing gcc features easier
166check_gcc=$(shell \
167 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
168 then echo "$(1)"; else echo "$(2)"; fi)
169check_as=$(shell \
170 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
171 then echo "-Wa,$(1)"; fi)
172check_ld=$(shell \
173 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
174 then echo "$(1)"; fi)
175
176# Use variable indirection here so that we can have variable
177# names with fun chars in them like equal signs
178define check-tool-var
179ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
180_v = $(2)_$(3)
181ifndef $$(_v)
182$$(_v) := $$(call $(1),$(subst %, ,$(3)))
183export $$(_v)
184endif
185endif
186endef
187
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.
191define check-gcc-var
192$(call check-tool-var,check_gcc,CFLAG,$(1))
193endef
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).
198define check-as-var
199$(call check-tool-var,check_as,ASFLAG,$(1))
200_v = CFLAG_-Wa$(1)
201export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
202endef
203# Usage: check-ld-var,<flag>
204# Check the linker to see if it supports <flag>. Export the
205# variable LDFLAG_<flag> if it does (for invoking the linker),
206# as well CFLAG_-Wl<flag> (for invoking the compiler driver).
207define check-ld-var
208$(call check-tool-var,check_ld,LDFLAG,$(1))
209_v = CFLAG_-Wl$(1)
210export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
211endef
212# Usage: cache-output-var,<variable>,<shell command>
213# Execute <shell command> and cache the output in <variable>.
214define cache-output-var
215ifndef $(1)
216$(1) := $$(shell $(2))
217export $(1)
218endif
219endef
220
221
222ARFLAGS:=cr
223
224
225# Flags in OPTIMIZATION are used only for non-debug builds
226
227OPTIMIZATION:=
228# Use '-Os' optimization if available, else use -O2, allow Config to override
229ifneq ($(TARGET_ARCH),m68k)
230$(eval $(call check-gcc-var,-Os))
231ifneq ($(CFLAG_-Os),)
232OPTIMIZATION += $(CFLAG_-Os)
233else
234$(eval $(call check-gcc-var,-O2))
235OPTIMIZATION += $(CFLAG_-O2)
236endif
237endif
238# Use the gcc 3.4 -funit-at-a-time optimization when available
239$(eval $(call check-gcc-var,-funit-at-a-time))
240OPTIMIZATION += $(CFLAG_-funit-at-a-time)
241# shrinks code by about 0.1%
242$(eval $(call check-gcc-var,-fmerge-all-constants))
243$(eval $(call check-gcc-var,-fstrict-aliasing))
244OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
245
246$(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
247GCC_VER := $(subst ., ,$(GCC_VER))
248GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
249#GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
250
251ifeq ($(GCC_MAJOR_VER),4)
252# shrinks code, results are from 4.0.2
253# 0.36%
254$(eval $(call check-gcc-var,-fno-tree-loop-optimize))
255OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
256# 0.34%
257$(eval $(call check-gcc-var,-fno-tree-dominator-opts))
258OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
259# 0.1%
260$(eval $(call check-gcc-var,-fno-strength-reduce))
261OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
262endif
263
264
265# CPU_CFLAGS-y contain options which are not warnings,
266# not include or library paths, and not optimizations.
267
268# Why -funsigned-char: I hunted a bug related to incorrect
269# sign extension of 'char' type for 10 hours straight. Not fun.
270CPU_CFLAGS-y := -funsigned-char -fno-builtin
271
272$(eval $(call check-gcc-var,-fno-asm))
273CPU_CFLAGS-y += $(CFLAG_-fno-asm)
274
275LDADD_LIBFLOAT=
276ifeq ($(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.
280ifneq ($(TARGET_ARCH),nios)
281ifneq ($(TARGET_ARCH),nios2)
282ifneq ($(TARGET_ARCH),sh)
283ifneq ($(TARGET_ARCH),c6x)
284CPU_CFLAGS-y += -msoft-float
285endif
286endif
287endif
288endif
289ifeq ($(TARGET_ARCH),arm)
290# No longer needed with current toolchains, but leave it here for now.
291# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
292# LDADD_LIBFLOAT=-lfloat
293endif
294endif
295
296$(eval $(call check-gcc-var,-std=gnu99))
297CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
298
299CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
300CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
301
302CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
303CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
304
305PICFLAG-y := -fPIC
306PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
307PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
308PICFLAG := $(PICFLAG-y)
309PIEFLAG_NAME:=-fPIE
310
311# Some nice CPU specific optimizations
312ifeq ($(TARGET_ARCH),i386)
313$(eval $(call check-gcc-var,-fomit-frame-pointer))
314 OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
315
316ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
317 # Non-SSE capable processor.
318 # NB: this may make SSE insns segfault!
319 # -O1 -march=pentium3, -Os -msse etc are known to be affected.
320 # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
321 # -m32 is needed if host is 64-bit
322 OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
323else
324$(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
325 OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
326endif
327
328 # Choice of alignment (please document why!)
329 # -falign-labels: in-line labels
330 # (reachable by normal code flow, aligning will insert nops
331 # which will be executed - may even make things slower)
332 # -falign-jumps: reachable only by a jump
333 # Generic: no alignment at all (smallest code)
334 GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
335ifeq ($(CONFIG_K7),y)
336 # Align functions to four bytes, use default for jumps and loops (why?)
337 GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
338endif
339ifeq ($(CONFIG_CRUSOE),y)
340 # Use compiler's default for functions, jumps and loops (why?)
341 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
342endif
343ifeq ($(CONFIG_CYRIXIII),y)
344 # Use compiler's default for functions, jumps and loops (why?)
345 GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
346endif
347 OPTIMIZATION+=$(GCC_FALIGN)
348
349 # Putting each function and data object into its own section
350 # allows for kbytes of less text if users link against static uclibc
351 # using ld --gc-sections.
352 # ld 2.18 can't do that (yet?) for shared libraries, so we itself
353 # do not use --gc-sections at shared lib link time.
354 # However, in combination with sections being sorted by alignment
355 # it does result in much reduced padding:
356 # text data bss dec hex
357 # 235319 1472 5992 242783 3b45f old.so
358 # 234104 1472 5980 241556 3af94 new.so
359 # Without -ffunction-sections, all functions will get aligned
360 # to 4 byte boundary by as/ld. This is arguably a bug in as.
361 # It specifies 4 byte align for .text even if not told to do so:
362 # Idx Name Size VMA LMA File off Algn
363 # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
364 CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
365 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
366$(eval $(call check-ld-var,--sort-section=alignment))
367 CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
368
369 CPU_LDFLAGS-y+=-m32
370 CPU_CFLAGS-y+=-m32
371 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
372 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
373 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
374 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
375 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
376 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
377 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
378 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
379 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
380 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
381 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
382 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
383 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
384 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
385 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
386 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
387endif
388
389ifeq ($(TARGET_ARCH),sparc)
390 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
391 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
392 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
393 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
394endif
395
396ifeq ($(TARGET_ARCH),arm)
397 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
398 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
399 CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
400endif
401
402ifeq ($(TARGET_ARCH),mips)
403 OPTIMIZATION+=-mno-split-addresses
404 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
405 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
406 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
407 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
408 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
409 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
410 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
411 ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
412 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
413 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
414 endif
415 ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
416 CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
417 CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
418 endif
419 CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
420 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
421 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
422endif
423
424ifeq ($(TARGET_ARCH),nios)
425 OPTIMIZATION+=-funaligned-struct-hack
426 CPU_LDFLAGS-y+=-Wl,-m32
427 CPU_CFLAGS-y+=-Wl,-m32
428endif
429
430ifeq ($(TARGET_ARCH),sh)
431$(eval $(call check-gcc-var,-mprefergot))
432 OPTIMIZATION += $(CFLAG_-mprefergot)
433 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
434 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
435 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
436 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
437ifeq ($(UCLIBC_HAS_FPU),y)
438 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
439 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
440else
441 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
442 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
443endif
444endif
445
446ifeq ($(TARGET_ARCH),sh64)
447 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
448 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
449 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
450endif
451
452ifeq ($(TARGET_ARCH),h8300)
453 SYMBOL_PREFIX=_
454 CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
455 CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
456 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
457 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
458endif
459
460ifeq ($(TARGET_ARCH),i960)
461 OPTIMIZATION+=-mh -mint32 #-fsigned-char
462endif
463
464ifeq ($(TARGET_ARCH),e1)
465 OPTIMIZATION+=-mgnu-param
466endif
467
468ifeq ($(TARGET_ARCH),cris)
469 CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
470 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
471 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
472 PICFLAG:=-fpic
473 PIEFLAG_NAME:=-fpie
474endif
475
476ifeq ($(TARGET_ARCH),m68k)
477 # -fPIC is only supported for 68020 and above. It is not supported
478 # for 68000, 68010, or Coldfire.
479 PICFLAG:=-fpic
480 PIEFLAG_NAME:=-fpie
481endif
482
483ifeq ($(TARGET_ARCH),powerpc)
484# PowerPC can hold 8192 entries in its GOT with -fpic which is more than
485# enough. Therefore use -fpic which will reduce code size and generates
486# faster code.
487 PICFLAG:=-fpic
488 PIEFLAG_NAME:=-fpie
489 PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
490 CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
491 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
492
493endif
494
495ifeq ($(TARGET_ARCH),bfin)
496 SYMBOL_PREFIX=_
497ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
498 CPU_CFLAGS-y:=-mfdpic
499 CPU_LDFLAGS-y += -Wl,-melf32bfinfd
500 PICFLAG:=-fpic
501 PIEFLAG_NAME:=-fpie
502endif
503ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
504 PICFLAG := -mleaf-id-shared-library
505endif
506endif
507
508ifeq ($(TARGET_ARCH),frv)
509 CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
510 # Using -pie causes the program to have an interpreter, which is
511 # forbidden, so we must make do with -shared. Unfortunately,
512 # -shared by itself would get us global function descriptors
513 # and calls through PLTs, dynamic resolution of symbols, etc,
514 # which would break as well, but -Bsymbolic comes to the rescue.
515 export LDPIEFLAG:=-shared -Wl,-Bsymbolic
516 UCLIBC_LDSO=ld.so.1
517endif
518
519ifeq ($(strip $(TARGET_ARCH)),avr32)
520 CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
521 CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
522 CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
523endif
524
525ifeq ($(TARGET_ARCH),i960)
526 SYMBOL_PREFIX=_
527endif
528
529ifeq ($(TARGET_ARCH),v850)
530 SYMBOL_PREFIX=_
531endif
532
533ifeq ($(TARGET_ARCH),c6x)
534 PIEFLAG:=
535 CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
536 CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
537 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
538 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
539 CPU_LDFLAGS-y += $(CPU_CFLAGS)
540endif
541
542$(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
543PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
544ifeq ($(PIEFLAG),)
545PIEFLAG := $(PICFLAG)
546endif
547# We need to keep track of both the CC PIE flag (above) as
548# well as the LD PIE flag (below) because we can't rely on
549# gcc passing -pie if we used -fPIE. We need to directly use -pie
550# instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
551$(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
552
553# Check for --as-needed support in linker
554ifndef LD_FLAG_ASNEEDED
555_LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
556ifneq ($(_LD_FLAG_ASNEEDED),)
557export LD_FLAG_ASNEEDED:=--as-needed
558endif
559endif
560ifndef LD_FLAG_NO_ASNEEDED
561ifdef LD_FLAG_ASNEEDED
562export LD_FLAG_NO_ASNEEDED:=--no-as-needed
563endif
564endif
565ifndef CC_FLAG_ASNEEDED
566ifdef LD_FLAG_ASNEEDED
567export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
568endif
569endif
570ifndef CC_FLAG_NO_ASNEEDED
571ifdef LD_FLAG_NO_ASNEEDED
572export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
573endif
574endif
575link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
576
577# Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
578ifndef ASNEEDED
579export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
580ifeq ($(UCLIBC_HAS_BACKTRACE),y)
581# Only used in installed libc.so linker script
582UBACKTRACE_FULL_NAME := $(RUNTIME_PREFIX)lib/$(UBACKTRACE_DSO)
583export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UBACKTRACE_FULL_NAME) )" || echo "$(UBACKTRACE_FULL_NAME)")
584else
585export UBACKTRACE_ASNEEDED:=""
586endif
587endif
588
589# Add a bunch of extra pedantic annoyingly strict checks
590WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
591ifeq ($(EXTRA_WARNINGS),y)
592WARNING_FLAGS += \
593 -Wformat=2 \
594 -Wmissing-noreturn \
595 -Wmissing-format-attribute \
596 -Wmissing-prototypes \
597 -Wmissing-declarations \
598 -Wnested-externs \
599 -Wnonnull \
600 -Wold-style-declaration \
601 -Wold-style-definition \
602 -Wshadow \
603 -Wundef
604# Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
605WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
606endif
607WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
608$(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
609XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
610
611CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
612
613# Save the tested flag in a single variable and force it to be
614# evaluated just once. Then use that computed value.
615$(eval $(call check-gcc-var,-fno-stack-protector))
616SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
617ifeq ($(UCLIBC_BUILD_SSP),y)
618$(eval $(call check-gcc-var,-fno-stack-protector-all))
619$(eval $(call check-gcc-var,-fstack-protector))
620$(eval $(call check-gcc-var,-fstack-protector-all))
621SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
622SSP_CFLAGS += $(CFLAG_-fstack-protector)
623SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
624else
625SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
626endif
627
628$(eval $(call check-gcc-var,-nostdlib))
629
630# Collect all CFLAGS components
631CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
632 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
633 -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
634 -I$(top_srcdir)libc/sysdeps/linux \
635 -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
636
637# We need this to be checked within libc-symbols.h
638ifneq ($(HAVE_SHARED),y)
639CFLAGS += -DSTATIC
640endif
641
642$(eval $(call check-ld-var,--warn-once))
643$(eval $(call check-ld-var,--sort-common))
644$(eval $(call check-ld-var,--discard-all))
645LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
646 -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
647# binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
648#$(eval $(call check-ld-var,--gc-sections))
649#LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
650
651$(eval $(call check-gcc-var,-fdata-sections))
652$(eval $(call check-gcc-var,-ffunction-sections))
653
654ifeq ($(UCLIBC_BUILD_RELRO),y)
655LDFLAGS_NOSTRIP+=-Wl,-z,relro
656endif
657
658ifeq ($(UCLIBC_BUILD_NOW),y)
659LDFLAGS_NOSTRIP+=-Wl,-z,now
660endif
661
662ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
663# Be sure that binutils support it
664$(eval $(call check-ld-var,--hash-style=gnu))
665ifeq ($(LDFLAG_--hash-style=gnu),)
666ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
667$(error Your binutils do not support --hash-style option, while you want to use it)
668endif
669else
670LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
671endif
672endif
673
674LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
675ifeq ($(DODEBUG),y)
676CFLAGS += -O0 -g3 -DDEBUG
677else
678CFLAGS += $(OPTIMIZATION) -g3
679endif
680ifeq ($(DOSTRIP),y)
681LDFLAGS += -Wl,-s
682else
683STRIPTOOL := true -Stripping_disabled
684endif
685ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
686CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
687endif
688
689ifeq ($(DOMULTI),y)
690# we try to compile all sources at once into an object (IMA), but
691# gcc-3.3.x does not support it
692# gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
693# gcc-4.0.x supports it, supports the --combine flag, but does not need it
694# gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
695ifeq ($(GCC_MAJOR_VER),3)
696DOMULTI:=n
697else
698$(eval $(call check-gcc-var,--combine))
699CFLAGS += $(CFLAG_--combine)
700endif
701else
702DOMULTI:=n
703endif
704
705ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
706LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
707endif
708
709ifeq ($(UCLIBC_HAS_THREADS),y)
710ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
711 PTNAME := nptl
712 CFLAGS += -DHAVE_FORCED_UNWIND
713else
714ifeq ($(LINUXTHREADS_OLD),y)
715 PTNAME := linuxthreads.old
716else
717 PTNAME := linuxthreads
718endif
719endif
720PTDIR := libpthread/$(PTNAME)
721# set up system dependencies include dirs (NOTE: order matters!)
722ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
723PTINC:= -I$(top_builddir)$(PTDIR) \
724 -I$(top_srcdir)$(PTDIR) \
725 $(if $(TARGET_ARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
726 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
727 -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
728 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
729 -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
730 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
731 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
732 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
733 -I$(top_srcdir)$(PTDIR)/sysdeps/generic \
734 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
735 -I$(top_srcdir)ldso/include
736#
737# Test for TLS if NPTL support was selected.
738#
739GCC_HAS_TLS=$(shell \
740 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
741ifneq ($(GCC_HAS_TLS),)
742gcc_tls_test_fail:
743 @echo "####";
744 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
745 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
746 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
747 @echo "#### about this problem.";
748 @echo "####";
749 @echo "#### Exiting...";
750 @echo "####";
751 @exit 1;
752endif
753else
754PTINC := \
755 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
756 -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
757 -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
758 -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
759 -I$(top_srcdir)$(PTDIR) \
760 -I$(top_srcdir)libpthread
761endif
762CFLAGS+=$(PTINC)
763else
764 PTNAME :=
765 PTINC :=
766endif
767CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
768CFLAGS += -I$(KERNEL_HEADERS)
769
770#CFLAGS += -iwithprefix include-fixed -iwithprefix include
771$(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
772CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
773CFLAGS += $(CC_INC)
774
775ifneq ($(DOASSERTS),y)
776CFLAGS+=-DNDEBUG
777endif
778
779ifeq ($(SYMBOL_PREFIX),_)
780CFLAGS+=-D__UCLIBC_UNDERSCORES__
781endif
782
783# Keep the check_as from being needlessly executed
784ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
785$(eval $(call check-as-var,--noexecstack))
786endif
787ASFLAGS = $(ASFLAG_--noexecstack)
788
789LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
790$(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
791LIBGCC_DIR:=$(dir $(LIBGCC))
792
793# moved from libpthread/linuxthreads
794ifeq ($(UCLIBC_CTOR_DTOR),y)
795SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
796SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
797endif
798
799LOCAL_INSTALL_PATH := install_dir