1 # Rules.make for uClibc
3 # Copyright (C) 2000 by Lineo, inc.
4 # Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
6 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
9 #-----------------------------------------------------------
10 # This file contains rules which are shared between multiple
11 # Makefiles. All normal configuration options live in the
12 # file named ".config". Don't mess with this file unless
13 # you know what you are doing.
16 #-----------------------------------------------------------
17 # If you are running a cross compiler, you will want to set
18 # 'CROSS' to something more interesting ... Target
19 # architecture is determined by asking the CC compiler what
20 # arch it compiles things for, so unless your compiler is
21 # broken, you should not need to specify TARGET_ARCH.
23 # Most people will set this stuff on the command line, i.e.
24 # make CROSS=arm-linux-
25 # will build uClibc for 'arm'.
34 STRIPTOOL = $(CROSS)strip
41 STRIP_FLAGS ?= -x -R .note -R .comment
43 # Select the compiler needed to build binaries for your development system
45 BUILD_CFLAGS = -O2 -Wall
48 #---------------------------------------------------------
49 # Nothing beyond this point should ever be touched by mere
50 # mortals. Unless you hang out with the gods, you should
51 # probably leave all this stuff alone.
53 # Pull in the user's uClibc configuration
54 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
55 -include $(top_builddir).config
58 # Make certain these contain a final "/", but no "//"s.
59 TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | sed -e 's/^TARGET_ARCH=//' -e 's/"//g')
60 TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
61 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
62 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
63 KERNEL_SOURCE:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_SOURCE))))))
64 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_SOURCE
67 # Now config hard core
71 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
72 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
74 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
77 SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
78 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sh64 sparc64 x86_64 ),)
79 UCLIBC_LDSO_NAME := ld64-uClibc
81 UCLIBC_LDSO_NAME := ld-uClibc
83 UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
84 NONSHARED_LIBNAME := uclibc_nonshared.a
85 libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
86 interp := $(top_builddir)lib/interp.os
87 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
88 headers_dep := $(top_builddir)include/bits/sysnum.h
89 sub_headers := $(headers_dep)
91 #LIBS :=$(interp) -L$(top_builddir)lib -lc
92 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
94 # Make sure DESTDIR and PREFIX can be used to install
95 # PREFIX is a uClibcism while DESTDIR is a common GNUism
100 ifneq ($(HAVE_SHARED),y)
107 CROSS=$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
110 # A nifty macro to make testing gcc features easier
112 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
113 then echo "$(1)"; else echo "$(2)"; fi)
115 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
116 then echo "-Wa,$(1)"; fi)
118 if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
119 then echo "$(1)"; fi)
124 # Use '-Os' optimization if available, else use -O2, allow Config to override
125 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
126 # Use the gcc 3.4 -funit-at-a-time optimization when available
127 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
129 GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
130 #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
132 ifeq ($(GCC_MAJOR_VER),4)
133 # shrinks code, results are from 4.0.2
135 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
137 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
139 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
145 # Some nice CPU specific optimizations
146 ifeq ($(TARGET_ARCH),i386)
147 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
148 OPTIMIZATION+=$(call check_gcc,-falign-jumps=0 -falign-loops=0,-malign-jumps=0 -malign-loops=0)
149 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
150 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
151 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
152 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
153 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
154 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
155 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
156 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
157 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
158 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
159 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686) $(call check_gcc,-falign-functions=4,-malign-functions=4)
160 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686 $(call check_gcc,-falign-functions=0,-malign-functions=0)
161 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
162 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
163 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486) $(call check_gcc,-falign-functions=0,-malign-functions=0)
164 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
167 ifeq ($(TARGET_ARCH),sparc)
168 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
169 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
170 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
171 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
174 ifeq ($(TARGET_ARCH),arm)
175 OPTIMIZATION+=-fstrict-aliasing
176 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
177 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
178 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
179 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
180 CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
181 CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
182 CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
183 CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4
184 CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4
185 CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4
186 CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4
187 CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5
188 CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
189 CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
190 CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
191 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
192 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv4 -Wa,-mcpu=xscale
195 ifeq ($(TARGET_ARCH),mips)
196 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
197 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
198 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
199 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
200 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
201 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
202 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
203 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
206 ifeq ($(TARGET_ARCH),nios)
211 ifeq ($(TARGET_ARCH),sh)
212 OPTIMIZATION+=-fstrict-aliasing
213 OPTIMIZATION+= $(call check_gcc,-mprefergot,)
214 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
215 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
216 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
217 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
218 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
219 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
220 ifeq ($(UCLIBC_HAS_FLOATS),y)
221 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
222 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
224 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
225 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
229 ifeq ($(TARGET_ARCH),sh64)
230 OPTIMIZATION+=-fstrict-aliasing
231 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-EL
232 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-EB
233 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
234 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
235 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
238 ifeq ($(TARGET_ARCH),h8300)
239 CPU_LDFLAGS-$(CONFIG_H8300H)+= -ms8300h
240 CPU_LDFLAGS-$(CONFIG_H8S) += -ms8300s
241 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
242 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
245 ifeq ($(TARGET_ARCH),cris)
246 CPU_LDFLAGS-$(CONFIG_CRIS)+=-mcrislinux
247 CPU_LDFLAGS-$(CONFIG_CRISV32)+=-mcrislinux
248 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
253 ifeq ($(TARGET_ARCH),m68k)
254 # -fPIC is only supported for 68020 and above. It is not supported
255 # for 68000, 68010, or Coldfire.
260 ifeq ($(TARGET_ARCH),powerpc)
261 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
262 # enough. Therefore use -fpic which will reduce code size and generates
268 ifeq ($(TARGET_ARCH),bfin)
272 ifeq ($(TARGET_ARCH),frv)
273 CPU_LDFLAGS-$(CONFIG_FRV)+=-melf32frvfd
274 CPU_CFLAGS-$(CONFIG_FRV)+=-mfdpic
275 # Using -pie causes the program to have an interpreter, which is
276 # forbidden, so we must make do with -shared. Unfortunately,
277 # -shared by itself would get us global function descriptors
278 # and calls through PLTs, dynamic resolution of symbols, etc,
279 # which would break as well, but -Bsymbolic comes to the rescue.
280 export LDPIEFLAG:=-shared -Bsymbolic
284 # Keep the check_gcc from being needlessly executed
286 ifneq ($(UCLIBC_BUILD_PIE),y)
289 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
292 # We need to keep track of both the CC PIE flag (above) as
293 # well as the LD PIE flag (below) because we can't rely on
294 # gcc passing -pie if we used -fPIE
296 ifneq ($(UCLIBC_BUILD_PIE),y)
299 export LDPIEFLAG:=$(shell $(LD) --help | grep -q pie && echo "-Wl,-pie")
303 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
305 ifneq ($(UCLIBC_HAS_SSP),y)
308 export ASNEEDED:=$(shell (LD_TMP=$(mktemp LD_XXXXXX) ; echo "GROUP ( AS_NEEDED ( /usr/lib/libc.so ) )" > $LD_TMP && if $(LD) -T $LD_TMP -o /dev/null > /dev/null 2>&1; then echo "AS_NEEDED ( $(UCLIBC_LDSO) )"; else echo "$(UCLIBC_LDSO)"; fi; rm -f $LD_TMP ) )
312 # Add a bunch of extra pedantic annoyingly strict checks
313 XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
314 ifeq ($(EXTRA_WARNINGS),y)
315 XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
316 XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
317 # works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
318 #XWARNINGS+=-Wdeclaration-after-statement
320 XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
321 CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
323 SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
324 ifeq ($(UCLIBC_BUILD_SSP),y)
325 SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
326 SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
327 SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
329 SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
332 # Some nice CFLAGS to work with
333 CFLAGS := -include $(top_builddir)include/libc-symbols.h \
334 $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
335 -fno-builtin -nostdinc -I$(top_builddir)include -I.
338 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
339 # If -msoft-float isn't supported, we want an error anyway.
340 # Hmm... might need to revisit this for arm since it has 2 different
341 # soft float encodings.
342 ifneq ($(TARGET_ARCH),nios)
343 ifneq ($(TARGET_ARCH),nios2)
344 CFLAGS += -msoft-float
347 ifeq ($(TARGET_ARCH),arm)
348 # No longer needed with current toolchains, but leave it here for now.
349 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
350 # LDADD_LIBFLOAT=-lfloat
354 # Make sure "char" behavior is the same everywhere
355 CFLAGS += -fsigned-char
357 # We need this to be checked within libc-symbols.h
358 ifneq ($(HAVE_SHARED),y)
362 # only i386 is known to work if compile.S gets -D__ASSEMBLER__
363 #CFLAGS += $(call check_gcc,-std=c99,)
365 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
366 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
367 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
369 ifeq ($(UCLIBC_BUILD_RELRO),y)
370 LDFLAGS_NOSTRIP+=-z relro
373 ifeq ($(UCLIBC_BUILD_NOW),y)
374 LDFLAGS_NOSTRIP+=-z now
377 LDFLAGS:=$(LDFLAGS_NOSTRIP) -z defs
382 CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
385 STRIPTOOL := true -Stripping_disabled
391 # we try to compile all sources at once into an object (IMA), but
392 # gcc-3.3.x does not support it
393 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
394 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
395 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
396 ifeq ($(GCC_MAJOR_VER),3)
399 CFLAGS+=$(call check_gcc,--combine,)
405 ifeq ($(UCLIBC_HAS_THREADS),y)
406 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
409 ifeq ($(LINUXTHREADS_OLD),y)
410 PTNAME := linuxthreads.old
412 PTNAME := linuxthreads
415 PTDIR := $(top_builddir)libpthread/$(PTNAME)
416 # set up system dependencies include dirs (NOTE: order matters!)
417 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
419 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
420 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
421 -I$(PTDIR)/sysdeps/unix/sysv/linux \
422 -I$(PTDIR)/sysdeps/pthread \
423 -I$(PTDIR)/sysdeps/pthread/bits \
424 -I$(PTDIR)/sysdeps/generic \
425 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
426 -I$(top_srcdir)ldso/include
428 # Test for TLS if NPTL support was selected.
430 GCC_HAS_TLS=$(shell \
431 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
432 ifneq ($(GCC_HAS_TLS),)
435 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
436 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
437 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
438 @echo "#### about this problem.";
440 @echo "#### Exiting...";
446 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
447 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
448 -I$(PTDIR)/sysdeps/unix/sysv/linux \
449 -I$(PTDIR)/sysdeps/pthread \
451 -I$(top_builddir)libpthread
459 # Sigh, some stupid versions of gcc can't seem to cope with '-iwithprefix include'
460 #CFLAGS+=-iwithprefix include
461 CFLAGS+=-isystem $(shell $(CC) -print-file-name=include)
463 ifneq ($(DOASSERTS),y)
467 # moved from ldso/{ldso,libdl}
468 # BEWARE!!! At least mips* will die if -O0 is used!!!
469 ifeq ($(TARGET_ARCH),mips)
470 CFLAGS:=$(CFLAGS:-O0=-O1)
473 # Keep the check_as from being needlessly executed
474 ifndef ASFLAGS_NOEXEC
475 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
476 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
478 export ASFLAGS_NOEXEC :=
481 ASFLAGS = $(ASFLAGS_NOEXEC)
483 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
484 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
485 LIBGCC_DIR:=$(dir $(LIBGCC))
487 # moved from libpthread/linuxthreads
488 ifeq ($(UCLIBC_CTOR_DTOR),y)
489 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
490 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
493 ########################################
495 # uClinux shared lib support
498 ifeq ($(CONFIG_BINFMT_SHARED_FLAT),y)
499 # For the shared version of this, we specify no stack and its library ID
502 export LIBID FLTFLAGS
503 SHARED_TARGET = lib/libc