1 # Rules.make for uClibc
3 # Copyright (C) 2000 by Lineo, inc.
4 # Copyright (C) 2000-2005 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
40 STRIP_FLAGS ?= -x -R .note -R .comment
42 # Select the compiler needed to build binaries for your development system
44 BUILD_CFLAGS = -O2 -Wall
47 #---------------------------------------------------------
48 # Nothing beyond this point should ever be touched by mere
49 # mortals. Unless you hang out with the gods, you should
50 # probably leave all this stuff alone.
54 VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
55 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
57 export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
60 SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
61 UCLIBC_LDSO := ld-uClibc.so.$(MAJOR_VERSION)
62 NONSHARED_LIBNAME := uclibc_nonshared.a
63 libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
64 interp := $(top_builddir)lib/interp.os
65 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
66 headers_dep := $(top_builddir)include/bits/sysnum.h
68 #LIBS :=$(interp) -L$(top_builddir)lib -lc
69 LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
71 # Make sure DESTDIR and PREFIX can be used to install
72 # PREFIX is a uClibcism while DESTDIR is a common GNUism
77 # Pull in the user's uClibc configuration
78 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
79 -include $(top_builddir).config
83 CROSS=$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
86 # A nifty macro to make testing gcc features easier
88 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
89 then echo "$(1)"; else echo "$(2)"; fi)
91 if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
92 then echo "-Wa,$(1)"; fi)
94 # Setup some shortcuts so that silent mode is silent like it should be
95 ifeq ($(findstring s,$(MAKEFLAGS)),)
96 export MAKE_IS_SILENT=n
100 export MAKE_IS_SILENT=y
105 # Make certain these contain a final "/", but no "//"s.
106 TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | sed -e 's/^TARGET_ARCH=//' -e 's/"//g')
107 TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
108 RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
109 DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
110 KERNEL_SOURCE:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_SOURCE))))))
111 export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_SOURCE
119 # Some nice CPU specific optimizations
120 ifeq ($(TARGET_ARCH),i386)
121 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
122 OPTIMIZATION+=$(call check_gcc,-falign-jumps=0 -falign-loops=0,-malign-jumps=0 -malign-loops=0)
123 CPU_CFLAGS-$(CONFIG_386)+=-march=i386
124 CPU_CFLAGS-$(CONFIG_486)+=-march=i486
125 CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
126 CPU_CFLAGS-$(CONFIG_586)+=-march=i586
127 CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
128 CPU_CFLAGS-$(CONFIG_686)+=-march=i686
129 CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
130 CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
131 CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
132 CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
133 CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686) $(call check_gcc,-falign-functions=4,-malign-functions=4)
134 CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686 $(call check_gcc,-falign-functions=0,-malign-functions=0)
135 CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
136 CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
137 CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486) $(call check_gcc,-falign-functions=0,-malign-functions=0)
138 CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
141 ifeq ($(TARGET_ARCH),sparc)
142 CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
143 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
144 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
145 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
148 ifeq ($(TARGET_ARCH),arm)
149 OPTIMIZATION+=-fstrict-aliasing
150 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
151 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
152 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
153 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
154 CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
155 CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
156 CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
157 CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4
158 CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4
159 CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4
160 CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5
161 CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
162 CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
163 CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
164 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
165 CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv4 -Wa,-mcpu=xscale
168 ifeq ($(TARGET_ARCH),mips)
169 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
170 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
171 CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
172 CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
173 CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
174 CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
175 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
176 CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
179 ifeq ($(TARGET_ARCH),nios)
184 ifeq ($(TARGET_ARCH),sh)
185 OPTIMIZATION+=-fstrict-aliasing
186 OPTIMIZATION+= $(call check_gcc,-mprefergot,)
187 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
188 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
189 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
190 CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
191 CPU_CFLAGS-$(CONFIG_SH2)+=-m2
192 CPU_CFLAGS-$(CONFIG_SH3)+=-m3
193 ifeq ($(UCLIBC_HAS_FLOATS),y)
194 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
195 CPU_CFLAGS-$(CONFIG_SH4)+=-m4
197 CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
198 CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
202 ifeq ($(TARGET_ARCH),sh64)
203 OPTIMIZATION+=-fstrict-aliasing
204 CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-EL
205 CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-EB
206 CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
207 CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
208 CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
211 ifeq ($(TARGET_ARCH),h8300)
212 CPU_LDFLAGS-$(CONFIG_H8300H)+= -ms8300h
213 CPU_LDFLAGS-$(CONFIG_H8S) += -ms8300s
214 CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32 -fsigned-char
215 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32 -fsigned-char
218 ifeq ($(TARGET_ARCH),cris)
219 CPU_LDFLAGS-$(CONFIG_CRIS)+=-mcrislinux
220 CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
225 ifeq ($(TARGET_ARCH),powerpc)
226 # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
227 # enough. Therefore use -fpic which will reduce code size and generates
233 ifeq ($(TARGET_ARCH),bfin)
234 # This should also work, but why bother ? ;)
235 #PICFLAG:=-fPIC -mid-shared-library
239 ifeq ($(TARGET_ARCH),frv)
240 CPU_LDFLAGS-$(CONFIG_FRV)+=-melf32frvfd
241 CPU_CFLAGS-$(CONFIG_FRV)+=-mfdpic
242 # Using -pie causes the program to have an interpreter, which is
243 # forbidden, so we must make do with -shared. Unfortunately,
244 # -shared by itself would get us global function descriptors
245 # and calls through PLTs, dynamic resolution of symbols, etc,
246 # which would break as well, but -Bsymbolic comes to the rescue.
247 export LDPIEFLAG:=-shared -Bsymbolic
251 # Keep the check_gcc from being needlessly executed
253 ifneq ($(UCLIBC_BUILD_PIE),y)
256 export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
259 # We need to keep track of both the CC PIE flag (above) as
260 # well as the LD PIE flag (below) because we can't rely on
261 # gcc passing -pie if we used -fPIE
263 ifneq ($(UCLIBC_BUILD_PIE),y)
266 export LDPIEFLAG:=$(shell $(LD) --help | grep -q pie && echo "-Wl,-pie")
270 # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
272 ifneq ($(UCLIBC_HAS_SSP),y)
275 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 $LD_TMP ) )
279 # Use '-Os' optimization if available, else use -O2, allow Config to override
280 OPTIMIZATION+=$(call check_gcc,-Os,-O2)
281 # Use the gcc 3.4 -funit-at-a-time optimization when available
282 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
284 # Add a bunch of extra pedantic annoyingly strict checks
285 XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
286 XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
287 CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
290 ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
291 # Add -msoft-float to the CPU_FLAGS since ldso and libdl ignore CFLAGS.
292 # If -msoft-float isn't supported, we want an error anyway.
293 # Hmm... might need to revisit this for arm since it has 2 different
294 # soft float encodings.
295 ifneq ($(TARGET_ARCH),nios)
296 ifneq ($(TARGET_ARCH),nios2)
297 CPU_CFLAGS += -msoft-float
300 ifeq ($(TARGET_ARCH),arm)
301 # No longer needed with current toolchains, but leave it here for now.
302 # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
303 # LDADD_LIBFLOAT=-lfloat
307 SSP_DISABLE_FLAGS?=$(call check_gcc,-fno-stack-protector,)
308 ifeq ($(UCLIBC_BUILD_SSP),y)
309 SSP_CFLAGS:=$(call check_gcc,-fno-stack-protector-all,)
310 SSP_CFLAGS+=$(call check_gcc,-fstack-protector,)
311 SSP_ALL_CFLAGS?=$(call check_gcc,-fstack-protector-all,)
313 SSP_CFLAGS:=$(SSP_DISABLE_FLAGS)
316 # Some nice CFLAGS to work with
317 CFLAGS:=$(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
318 -fno-builtin -nostdinc -D_LIBC -I$(top_builddir)include -I.
320 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
322 ifeq ($(UCLIBC_BUILD_RELRO),y)
323 LDFLAGS_NOSTRIP+=-z relro
326 ifeq ($(UCLIBC_BUILD_NOW),y)
327 LDFLAGS_NOSTRIP+=-z now
330 LDFLAGS:=$(LDFLAGS_NOSTRIP) -z defs
334 STRIPTOOL:= true -Since_we_are_debugging
336 CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
341 # we try to compile all sources at once into an object (IMA), but
342 # gcc-3.3.x does not support it
343 # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
344 # gcc-4.0.x supports it, supports the --combine flag, but does not need it
345 # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
346 GCC_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
350 CFLAGS+=$(call check_gcc,--combine,)
356 ifeq ($(UCLIBC_HAS_THREADS),y)
357 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
360 ifeq ($(LINUXTHREADS_OLD),y)
361 PTNAME := linuxthreads.old
363 PTNAME := linuxthreads
366 PTDIR := $(top_builddir)libpthread/$(PTNAME)
367 # set up system dependencies include dirs (NOTE: order matters!)
368 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
371 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
372 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
373 -I$(PTDIR)/sysdeps/unix/sysv/linux \
374 -I$(PTDIR)/sysdeps/pthread \
375 -I$(PTDIR)/sysdeps/pthread/bits \
376 -I$(PTDIR)/sysdeps/generic \
377 -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
378 -I$(top_srcdir)ldso/include \
379 -include $(PTDIR)/compat/libc-symbols.h
381 # Test for TLS if NPTL support was selected.
383 GCC_HAS_TLS=$(shell \
384 echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
385 ifneq ($(GCC_HAS_TLS),)
388 @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
389 @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
390 @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
391 @echo "#### about this problem.";
393 @echo "#### Exiting...";
399 -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
400 -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
401 -I$(PTDIR)/sysdeps/unix/sysv/linux \
402 -I$(PTDIR)/sysdeps/pthread \
404 -I$(top_builddir)libpthread
412 # Sigh, some stupid versions of gcc can't seem to cope with '-iwithprefix include'
413 #CFLAGS+=-iwithprefix include
414 CFLAGS+=-isystem $(shell $(CC) -print-file-name=include)
416 ifneq ($(DOASSERTS),y)
420 ifneq ($(strip $(C_SYMBOL_PREFIX)),"")
421 CFLAGS+=-D__SYMBOL_PREFIX=1
424 # moved from ldso/{ldso,libdl}
425 # BEWARE!!! At least mips* will die if -O0 is used!!!
426 ifeq ($(TARGET_ARCH),mips)
427 CFLAGS:=$(CFLAGS:-O0=-O1)
430 # Keep the check_as from being needlessly executed
431 ifndef ASFLAGS_NOEXEC
432 ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
433 export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
435 export ASFLAGS_NOEXEC :=
438 ASFLAGS = $(ASFLAGS_NOEXEC)
440 LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
441 LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
442 LIBGCC_DIR:=$(dir $(LIBGCC))
444 # moved from libpthread/linuxthreads
445 ifeq ($(UCLIBC_CTOR_DTOR),y)
446 SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
447 SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
450 ########################################
452 # uClinux shared lib support
455 ifeq ($(CONFIG_BINFMT_SHARED_FLAT),y)
456 # For the shared version of this, we specify no stack and its library ID
459 export LIBID FLTFLAGS
460 SHARED_TARGET = lib/libc