Rules.mak 14 KB

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  1. # Rules.make for uClibc
  2. #
  3. # Copyright (C) 2000 by Lineo, inc.
  4. # Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
  5. #
  6. # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  7. #
  8. #-----------------------------------------------------------
  9. # This file contains rules which are shared between multiple
  10. # Makefiles. All normal configuration options live in the
  11. # file named ".config". Don't mess with this file unless
  12. # you know what you are doing.
  13. #-----------------------------------------------------------
  14. # If you are running a cross compiler, you will want to set
  15. # 'CROSS' to something more interesting ... Target
  16. # architecture is determined by asking the CC compiler what
  17. # arch it compiles things for, so unless your compiler is
  18. # broken, you should not need to specify TARGET_ARCH.
  19. #
  20. # Most people will set this stuff on the command line, i.e.
  21. # make CROSS=arm-linux-
  22. # will build uClibc for 'arm'.
  23. ifndef CROSS
  24. CROSS=
  25. endif
  26. CC = $(CROSS)gcc
  27. AR = $(CROSS)ar
  28. LD = $(CROSS)ld
  29. NM = $(CROSS)nm
  30. STRIPTOOL = $(CROSS)strip
  31. INSTALL = install
  32. LN = ln
  33. RM = rm -f
  34. STRIP_FLAGS ?= -x -R .note -R .comment
  35. # Select the compiler needed to build binaries for your development system
  36. HOSTCC = gcc
  37. BUILD_CFLAGS = -O2 -Wall
  38. #---------------------------------------------------------
  39. # Nothing beyond this point should ever be touched by mere
  40. # mortals. Unless you hang out with the gods, you should
  41. # probably leave all this stuff alone.
  42. MAJOR_VERSION := 0
  43. MINOR_VERSION := 9
  44. SUBLEVEL := 28
  45. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  46. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  47. LC_ALL := C
  48. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
  49. LIBC := libc
  50. SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
  51. UCLIBC_LDSO := ld-uClibc.so.$(MAJOR_VERSION)
  52. NONSHARED_LIBNAME := uclibc_nonshared.a
  53. libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
  54. interp := $(top_builddir)lib/interp.os
  55. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  56. headers_dep := $(top_builddir)include/bits/sysnum.h
  57. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  58. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
  59. # Make sure DESTDIR and PREFIX can be used to install
  60. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  61. ifndef PREFIX
  62. PREFIX = $(DESTDIR)
  63. endif
  64. # Pull in the user's uClibc configuration
  65. ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  66. -include $(top_builddir).config
  67. endif
  68. ifndef CROSS
  69. CROSS=$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
  70. endif
  71. # A nifty macro to make testing gcc features easier
  72. check_gcc=$(shell \
  73. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  74. then echo "$(1)"; else echo "$(2)"; fi)
  75. check_as=$(shell \
  76. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  77. then echo "-Wa,$(1)"; fi)
  78. # Setup some shortcuts so that silent mode is silent like it should be
  79. ifeq ($(findstring s,$(MAKEFLAGS)),)
  80. export MAKE_IS_SILENT=n
  81. SECHO=@echo
  82. SHELL_SET_X=set -x
  83. else
  84. export MAKE_IS_SILENT=y
  85. SECHO=-@false
  86. SHELL_SET_X=set +x
  87. endif
  88. # Make certain these contain a final "/", but no "//"s.
  89. TARGET_ARCH:=$(shell grep -s ^TARGET_ARCH $(top_builddir)/.config | sed -e 's/^TARGET_ARCH=//' -e 's/"//g')
  90. TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
  91. RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
  92. DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
  93. KERNEL_SOURCE:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_SOURCE))))))
  94. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_SOURCE
  95. ARFLAGS:=cr
  96. OPTIMIZATION:=
  97. PICFLAG:=-fPIC
  98. PIEFLAG_NAME:=-fPIE
  99. # Some nice CPU specific optimizations
  100. ifeq ($(TARGET_ARCH),i386)
  101. OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
  102. OPTIMIZATION+=$(call check_gcc,-falign-jumps=0 -falign-loops=0,-malign-jumps=0 -malign-loops=0)
  103. CPU_CFLAGS-$(CONFIG_386)+=-march=i386
  104. CPU_CFLAGS-$(CONFIG_486)+=-march=i486
  105. CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
  106. CPU_CFLAGS-$(CONFIG_586)+=-march=i586
  107. CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
  108. CPU_CFLAGS-$(CONFIG_686)+=-march=i686
  109. CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
  110. CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
  111. CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
  112. CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
  113. CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686) $(call check_gcc,-falign-functions=4,-malign-functions=4)
  114. CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686 $(call check_gcc,-falign-functions=0,-malign-functions=0)
  115. CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
  116. CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
  117. CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486) $(call check_gcc,-falign-functions=0,-malign-functions=0)
  118. CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
  119. endif
  120. ifeq ($(TARGET_ARCH),sparc)
  121. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  122. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  123. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  124. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  125. endif
  126. ifeq ($(TARGET_ARCH),arm)
  127. OPTIMIZATION+=-fstrict-aliasing
  128. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
  129. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
  130. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  131. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  132. CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
  133. CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
  134. CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
  135. CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4
  136. CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4
  137. CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4
  138. CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5
  139. CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
  140. CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
  141. CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
  142. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
  143. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv4 -Wa,-mcpu=xscale
  144. endif
  145. ifeq ($(TARGET_ARCH),mips)
  146. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  147. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  148. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  149. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  150. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  151. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  152. endif
  153. ifeq ($(TARGET_ARCH),sh)
  154. OPTIMIZATION+=-fstrict-aliasing
  155. OPTIMIZATION+= $(call check_gcc,-mprefergot,)
  156. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
  157. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
  158. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  159. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  160. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  161. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  162. ifeq ($(UCLIBC_HAS_FLOATS),y)
  163. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  164. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  165. else
  166. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  167. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  168. endif
  169. endif
  170. ifeq ($(TARGET_ARCH),sh64)
  171. OPTIMIZATION+=-fstrict-aliasing
  172. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-EL
  173. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-EB
  174. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  175. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  176. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  177. endif
  178. ifeq ($(TARGET_ARCH),h8300)
  179. CPU_LDFLAGS-$(CONFIG_H8300H)+= -ms8300h
  180. CPU_LDFLAGS-$(CONFIG_H8S) += -ms8300s
  181. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32 -fsigned-char
  182. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32 -fsigned-char
  183. endif
  184. ifeq ($(TARGET_ARCH),cris)
  185. CPU_LDFLAGS-$(CONFIG_CRIS)+=-mcrislinux
  186. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  187. PICFLAG:=-fpic
  188. PIEFLAG_NAME:=-fpie
  189. endif
  190. ifeq ($(TARGET_ARCH),powerpc)
  191. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  192. # enough. Therefore use -fpic which will reduce code size and generates
  193. # faster code.
  194. PICFLAG:=-fpic
  195. PIEFLAG_NAME:=-fpie
  196. endif
  197. ifeq ($(TARGET_ARCH),frv)
  198. CPU_LDFLAGS-$(CONFIG_FRV)+=-melf32frvfd
  199. CPU_CFLAGS-$(CONFIG_FRV)+=-mfdpic
  200. # Using -pie causes the program to have an interpreter, which is
  201. # forbidden, so we must make do with -shared. Unfortunately,
  202. # -shared by itself would get us global function descriptors
  203. # and calls through PLTs, dynamic resolution of symbols, etc,
  204. # which would break as well, but -Bsymbolic comes to the rescue.
  205. export LDPIEFLAG:=-shared -Bsymbolic
  206. UCLIBC_LDSO=ld.so.1
  207. endif
  208. # Keep the check_gcc from being needlessly executed
  209. ifndef PIEFLAG
  210. ifneq ($(UCLIBC_BUILD_PIE),y)
  211. export PIEFLAG:=
  212. else
  213. export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
  214. endif
  215. endif
  216. # We need to keep track of both the CC PIE flag (above) as
  217. # well as the LD PIE flag (below) because we can't rely on
  218. # gcc passing -pie if we used -fPIE
  219. ifndef LDPIEFLAG
  220. ifneq ($(UCLIBC_BUILD_PIE),y)
  221. export LDPIEFLAG:=
  222. else
  223. export LDPIEFLAG:=$(shell $(LD) --help | grep -q pie && echo "-Wl,-pie")
  224. endif
  225. endif
  226. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  227. ifndef ASNEEDED
  228. ifneq ($(UCLIBC_HAS_SSP),y)
  229. export ASNEEDED:=
  230. else
  231. 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 $LD_TMP ) )
  232. endif
  233. endif
  234. # Use '-Os' optimization if available, else use -O2, allow Config to override
  235. OPTIMIZATION+=$(call check_gcc,-Os,-O2)
  236. # Use the gcc 3.4 -funit-at-a-time optimization when available
  237. OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
  238. # Add a bunch of extra pedantic annoyingly strict checks
  239. XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
  240. XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
  241. CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
  242. LDADD_LIBFLOAT=
  243. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  244. # Add -msoft-float to the CPU_FLAGS since ldso and libdl ignore CFLAGS.
  245. # If -msoft-float isn't supported, we want an error anyway.
  246. # Hmm... might need to revisit this for arm since it has 2 different
  247. # soft float encodings.
  248. CPU_CFLAGS += -msoft-float
  249. ifeq ($(TARGET_ARCH),arm)
  250. # No longer needed with current toolchains, but leave it here for now.
  251. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  252. # LDADD_LIBFLOAT=-lfloat
  253. endif
  254. endif
  255. SSP_DISABLE_FLAGS?=$(call check_gcc,-fno-stack-protector,)
  256. ifeq ($(UCLIBC_BUILD_SSP),y)
  257. SSP_CFLAGS:=$(call check_gcc,-fno-stack-protector-all,)
  258. SSP_CFLAGS+=$(call check_gcc,-fstack-protector,)
  259. SSP_ALL_CFLAGS?=$(call check_gcc,-fstack-protector-all,)
  260. else
  261. SSP_CFLAGS:=$(SSP_DISABLE_FLAGS)
  262. endif
  263. # Some nice CFLAGS to work with
  264. CFLAGS:=$(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  265. -fno-builtin -nostdinc -D_LIBC -I$(top_builddir)include -I.
  266. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
  267. ifeq ($(UCLIBC_BUILD_RELRO),y)
  268. LDFLAGS_NOSTRIP+=-z relro
  269. endif
  270. ifeq ($(UCLIBC_BUILD_NOW),y)
  271. LDFLAGS_NOSTRIP+=-z now
  272. endif
  273. LDFLAGS:=$(LDFLAGS_NOSTRIP) -z defs
  274. ifeq ($(DODEBUG),y)
  275. #CFLAGS += -g3
  276. CFLAGS += -O0 -g3
  277. STRIPTOOL:= true -Since_we_are_debugging
  278. else
  279. CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
  280. LDFLAGS += -s
  281. endif
  282. ifeq ($(DOMULTI),y)
  283. # we try to compile all sources at once into an object (IMA), but
  284. # gcc-3.3.x does not support it
  285. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  286. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  287. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  288. GCC_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
  289. ifeq ($(GCC_VER),3)
  290. DOMULTI:=n
  291. else
  292. CFLAGS+=$(call check_gcc,--combine,)
  293. endif
  294. else
  295. DOMULTI:=n
  296. endif
  297. ifeq ($(UCLIBC_HAS_THREADS),y)
  298. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  299. PTNAME := nptl
  300. else
  301. ifeq ($(LINUXTHREADS_OLD),y)
  302. PTNAME := linuxthreads.old
  303. else
  304. PTNAME := linuxthreads
  305. endif
  306. endif
  307. PTDIR := $(top_builddir)libpthread/$(PTNAME)
  308. # set up system dependencies include dirs (NOTE: order matters!)
  309. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  310. PTINC := \
  311. -I$(PTDIR)/compat \
  312. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  313. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  314. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  315. -I$(PTDIR)/sysdeps/pthread \
  316. -I$(PTDIR)/sysdeps/pthread/bits \
  317. -I$(PTDIR)/sysdeps/generic \
  318. -Ildso/include \
  319. -include $(PTDIR)/compat/libc-symbols.h
  320. #
  321. # Test for TLS if NPTL support was selected.
  322. #
  323. GCC_HAS_TLS=$(shell \
  324. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  325. ifneq ($(GCC_HAS_TLS),)
  326. gcc_tls_test_fail:
  327. @echo "####";
  328. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  329. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  330. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  331. @echo "#### about this problem.";
  332. @echo "####";
  333. @echo "#### Exiting...";
  334. @echo "####";
  335. @exit 1;
  336. endif
  337. else
  338. PTINC := \
  339. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  340. -I$(PTDIR)/sysdeps/pthread \
  341. -I$(PTDIR)
  342. endif
  343. CFLAGS+=$(PTINC)
  344. else
  345. PTNAME :=
  346. PTINC :=
  347. endif
  348. # Sigh, some stupid versions of gcc can't seem to cope with '-iwithprefix include'
  349. #CFLAGS+=-iwithprefix include
  350. CFLAGS+=-isystem $(shell $(CC) -print-file-name=include)
  351. ifneq ($(DOASSERTS),y)
  352. CFLAGS+=-DNDEBUG
  353. endif
  354. # moved from ldso/{ldso,libdl}
  355. # BEWARE!!! At least mips* will die if -O0 is used!!!
  356. ifeq ($(TARGET_ARCH),mips)
  357. CFLAGS:=$(CFLAGS:-O0=-O1)
  358. endif
  359. # Keep the check_as from being needlessly executed
  360. ifndef ASFLAGS_NOEXEC
  361. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  362. export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
  363. else
  364. export ASFLAGS_NOEXEC :=
  365. endif
  366. endif
  367. ASFLAGS = $(ASFLAGS_NOEXEC)
  368. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  369. LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
  370. LIBGCC_DIR:=$(dir $(LIBGCC))
  371. # moved from libpthread/linuxthreads
  372. ifeq ($(UCLIBC_CTOR_DTOR),y)
  373. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  374. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  375. endif
  376. ########################################
  377. #
  378. # uClinux shared lib support
  379. #
  380. ifeq ($(CONFIG_BINFMT_SHARED_FLAT),y)
  381. # For the shared version of this, we specify no stack and its library ID
  382. FLTFLAGS += -s 0
  383. LIBID=1
  384. export LIBID FLTFLAGS
  385. SHARED_TARGET = lib/libc
  386. endif