Rules.mak 23 KB

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  1. # 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. # make nano-doc
  8. # FOO = bar -- recursively expanded variable. Value is remebered verbatim.
  9. # If it contains references to other variables, these references
  10. # are expanded whenever this variable is _substituted_.
  11. # FOO := bar -- simply expanded variable. Right hand is expanded when
  12. # the variable is _defined_. Therefore faster than =.
  13. # FOO ?= bar -- set a value only if it is not already set
  14. # (behaves as =, not :=).
  15. # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  16. # check for proper make version
  17. ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  18. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  19. endif
  20. #-----------------------------------------------------------
  21. # This file contains rules which are shared between multiple
  22. # Makefiles. All normal configuration options live in the
  23. # file named ".config". Don't mess with this file unless
  24. # you know what you are doing.
  25. #-----------------------------------------------------------
  26. # If you are running a cross compiler, you will want to set
  27. # 'CROSS' to something more interesting ... Target
  28. # architecture is determined by asking the CC compiler what
  29. # arch it compiles things for, so unless your compiler is
  30. # broken, you should not need to specify TARGET_ARCH.
  31. #
  32. # Most people will set this stuff on the command line, i.e.
  33. # make CROSS=arm-linux-
  34. # will build uClibc for 'arm'.
  35. ifndef CROSS
  36. CROSS=
  37. endif
  38. CC = $(CROSS)gcc
  39. AR = $(CROSS)ar
  40. LD = $(CROSS)ld
  41. NM = $(CROSS)nm
  42. OBJDUMP = $(CROSS)objdump
  43. STRIPTOOL = $(CROSS)strip
  44. INSTALL = install
  45. LN = ln
  46. RM = rm -f
  47. TAR = tar
  48. SED = sed
  49. AWK = awk
  50. STRIP_FLAGS ?= -x -R .note -R .comment
  51. ## unused? if yes, remove after 0.9.31
  52. ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  53. # Select the compiler needed to build binaries for your development system
  54. HOSTCC = gcc
  55. BUILD_CFLAGS = -Os -Wall
  56. #---------------------------------------------------------
  57. # Nothing beyond this point should ever be touched by mere
  58. # mortals. Unless you hang out with the gods, you should
  59. # probably leave all this stuff alone.
  60. # strip quotes
  61. qstrip = $(strip $(subst ",,$(1)))
  62. #"))
  63. # Pull in the user's uClibc configuration
  64. ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  65. -include $(top_builddir).config
  66. endif
  67. TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  68. ifeq ($(TARGET_ARCH),)
  69. ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  70. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  71. -e s/arm.*/arm/ -e s/sa110/arm/ \
  72. -e s/sh.*/sh/ \
  73. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  74. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  75. -e s/xtensa.*/xtensa/ )
  76. else
  77. ARCH = $(TARGET_ARCH)
  78. endif
  79. export ARCH
  80. # Make certain these contain a final "/", but no "//"s.
  81. TARGET_SUBARCH:=$(call qstrip,$(shell grep -s '^TARGET_SUBARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_SUBARCH=//'))
  82. TARGET_SUBARCH:=$(call qstrip,$(TARGET_SUBARCH))
  83. RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(RUNTIME_PREFIX)))))
  84. DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(DEVEL_PREFIX)))))
  85. KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(call qstrip,$(KERNEL_HEADERS)))))
  86. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS
  87. # Now config hard core
  88. MAJOR_VERSION := 0
  89. MINOR_VERSION := 9
  90. SUBLEVEL := 30
  91. EXTRAVERSION :=-git
  92. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  93. ifneq ($(EXTRAVERSION),)
  94. VERSION := $(VERSION)$(EXTRAVERSION)
  95. endif
  96. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  97. LC_ALL := C
  98. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
  99. LIBC := libc
  100. SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
  101. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
  102. UCLIBC_LDSO_NAME := ld64-uClibc
  103. ARCH_NATIVE_BIT := 64
  104. else
  105. UCLIBC_LDSO_NAME := ld-uClibc
  106. ARCH_NATIVE_BIT := 32
  107. endif
  108. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
  109. NONSHARED_LIBNAME := uclibc_nonshared.a
  110. libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
  111. libc.depend := $(top_builddir)lib/$(SHARED_MAJORNAME:.$(MAJOR_VERSION)=)
  112. interp := $(top_builddir)lib/interp.os
  113. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  114. headers_dep := $(top_builddir)include/bits/sysnum.h
  115. sub_headers := $(headers_dep)
  116. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  117. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
  118. # Make sure DESTDIR and PREFIX can be used to install
  119. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  120. ifndef PREFIX
  121. PREFIX = $(DESTDIR)
  122. endif
  123. ifneq ($(HAVE_SHARED),y)
  124. libc :=
  125. interp :=
  126. ldso :=
  127. endif
  128. comma:=,
  129. space:= #
  130. ifndef CROSS
  131. CROSS=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  132. endif
  133. # A nifty macro to make testing gcc features easier
  134. check_gcc=$(shell \
  135. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  136. then echo "$(1)"; else echo "$(2)"; fi)
  137. check_as=$(shell \
  138. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  139. then echo "-Wa,$(1)"; fi)
  140. check_ld=$(shell \
  141. if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
  142. then echo "$(1)"; fi)
  143. ARFLAGS:=cr
  144. # Flags in OPTIMIZATION are used only for non-debug builds
  145. OPTIMIZATION:=
  146. # Use '-Os' optimization if available, else use -O2, allow Config to override
  147. OPTIMIZATION+=$(call check_gcc,-Os,-O2)
  148. # Use the gcc 3.4 -funit-at-a-time optimization when available
  149. OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
  150. # shrinks code by about 0.1%
  151. OPTIMIZATION+=$(call check_gcc,-fmerge-all-constants)
  152. GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
  153. #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
  154. ifeq ($(GCC_MAJOR_VER),4)
  155. # shrinks code, results are from 4.0.2
  156. # 0.36%
  157. OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
  158. # 0.34%
  159. OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
  160. # 0.1%
  161. OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
  162. endif
  163. # CPU_CFLAGS-y contain options which are not warnings,
  164. # not include or library paths, and not optimizations.
  165. # Why -funsigned-char: I hunted a bug related to incorrect
  166. # sign extension of 'char' type for 10 hours straight. Not fun.
  167. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  168. CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
  169. LDADD_LIBFLOAT=
  170. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  171. # If -msoft-float isn't supported, we want an error anyway.
  172. # Hmm... might need to revisit this for arm since it has 2 different
  173. # soft float encodings.
  174. ifneq ($(TARGET_ARCH),nios)
  175. ifneq ($(TARGET_ARCH),nios2)
  176. ifneq ($(TARGET_ARCH),sh)
  177. CPU_CFLAGS-y += -msoft-float
  178. endif
  179. endif
  180. endif
  181. ifeq ($(TARGET_ARCH),arm)
  182. # No longer needed with current toolchains, but leave it here for now.
  183. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  184. # LDADD_LIBFLOAT=-lfloat
  185. endif
  186. endif
  187. CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
  188. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  189. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  190. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  191. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  192. PICFLAG-y := -fPIC -DPIC
  193. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  194. PICFLAG := $(PICFLAG-y)
  195. PIEFLAG_NAME:=-fPIE
  196. # Some nice CPU specific optimizations
  197. ifeq ($(TARGET_ARCH),i386)
  198. OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
  199. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
  200. # Non-SSE capable processor.
  201. # NB: this may make SSE insns segfault!
  202. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  203. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  204. # -m32 is needed if host is 64-bit
  205. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  206. else
  207. OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
  208. endif
  209. # Choice of alignment (please document why!)
  210. # -falign-labels: in-line labels
  211. # (reachable by normal code flow, aligning will insert nops
  212. # which will be executed - may even make things slower)
  213. # -falign-jumps: reachable only by a jump
  214. # Generic: no alignment at all (smallest code)
  215. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  216. ifeq ($(CONFIG_K7),y)
  217. # Align functions to four bytes, use default for jumps and loops (why?)
  218. GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
  219. endif
  220. ifeq ($(CONFIG_CRUSOE),y)
  221. # Use compiler's default for functions, jumps and loops (why?)
  222. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  223. endif
  224. ifeq ($(CONFIG_CYRIXIII),y)
  225. # Use compiler's default for functions, jumps and loops (why?)
  226. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  227. endif
  228. OPTIMIZATION+=$(GCC_FALIGN)
  229. # Putting each function and data object into its own section
  230. # allows for kbytes of less text if users link against static uclibc
  231. # using ld --gc-sections.
  232. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  233. # do not use --gc-sections at shared lib link time.
  234. # However, in combination with sections being sorted by alignment
  235. # it does result in much reduced padding:
  236. # text data bss dec hex
  237. # 235319 1472 5992 242783 3b45f old.so
  238. # 234104 1472 5980 241556 3af94 new.so
  239. # Without -ffunction-sections, all functions will get aligned
  240. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  241. # It specifies 4 byte align for .text even if not told to do so:
  242. # Idx Name Size VMA LMA File off Algn
  243. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  244. CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
  245. ifneq ($(call check_ld,--sort-common),)
  246. CPU_LDFLAGS-y += -Wl,--sort-common
  247. endif
  248. ifneq ($(call check_ld,--sort-section alignment),)
  249. CPU_LDFLAGS-y += -Wl,--sort-section,alignment
  250. endif
  251. CPU_LDFLAGS-y+=-m32
  252. CPU_CFLAGS-y+=-m32
  253. CPU_CFLAGS-$(CONFIG_386)+=-march=i386
  254. CPU_CFLAGS-$(CONFIG_486)+=-march=i486
  255. CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
  256. CPU_CFLAGS-$(CONFIG_586)+=-march=i586
  257. CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
  258. CPU_CFLAGS-$(CONFIG_686)+=-march=i686
  259. CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
  260. CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
  261. CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
  262. CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
  263. CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
  264. CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
  265. CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
  266. CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
  267. CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
  268. CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
  269. endif
  270. ifeq ($(TARGET_ARCH),sparc)
  271. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  272. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  273. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  274. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  275. endif
  276. ifeq ($(TARGET_ARCH),arm)
  277. OPTIMIZATION+=-fstrict-aliasing
  278. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  279. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  280. CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
  281. CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
  282. CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
  283. CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
  284. CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
  285. CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
  286. CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
  287. CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
  288. CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
  289. CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
  290. CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
  291. CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
  292. CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
  293. CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
  294. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
  295. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
  296. CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
  297. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
  298. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
  299. endif
  300. ifeq ($(TARGET_ARCH),mips)
  301. OPTIMIZATIONS+=-mno-split-addresses
  302. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  303. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  304. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  305. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  306. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  307. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
  308. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  309. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  310. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
  311. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
  312. endif
  313. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  314. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
  315. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
  316. endif
  317. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  318. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  319. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  320. endif
  321. ifeq ($(TARGET_ARCH),nios)
  322. OPTIMIZATIONS+=-funaligned-struct-hack
  323. CPU_LDFLAGS-y+=-Wl,-m32
  324. CPU_CFLAGS-y+=-Wl,-m32
  325. endif
  326. ifeq ($(TARGET_ARCH),sh)
  327. OPTIMIZATION+=-fstrict-aliasing
  328. OPTIMIZATION+= $(call check_gcc,-mprefergot,)
  329. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  330. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  331. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  332. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  333. ifeq ($(UCLIBC_HAS_FPU),y)
  334. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  335. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  336. else
  337. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  338. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  339. endif
  340. endif
  341. ifeq ($(TARGET_ARCH),sh64)
  342. OPTIMIZATION+=-fstrict-aliasing
  343. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  344. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  345. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  346. endif
  347. ifeq ($(TARGET_ARCH),h8300)
  348. SYMBOL_PREFIX=_
  349. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  350. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  351. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  352. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  353. endif
  354. ifeq ($(TARGET_ARCH),i960)
  355. OPTIMIZATIONS+=-mh -mint32 #-fsigned-char
  356. endif
  357. ifeq ($(TARGET_ARCH),e1)
  358. OPTIMIZATIONS+=-mgnu-param
  359. endif
  360. ifeq ($(TARGET_ARCH),cris)
  361. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  362. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  363. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  364. PICFLAG:=-fpic
  365. PIEFLAG_NAME:=-fpie
  366. endif
  367. ifeq ($(TARGET_ARCH),m68k)
  368. # -fPIC is only supported for 68020 and above. It is not supported
  369. # for 68000, 68010, or Coldfire.
  370. PICFLAG:=-fpic
  371. PIEFLAG_NAME:=-fpie
  372. endif
  373. ifeq ($(TARGET_ARCH),powerpc)
  374. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  375. # enough. Therefore use -fpic which will reduce code size and generates
  376. # faster code.
  377. PICFLAG:=-fpic
  378. PIEFLAG_NAME:=-fpie
  379. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  380. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  381. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  382. endif
  383. ifeq ($(TARGET_ARCH),bfin)
  384. SYMBOL_PREFIX=_
  385. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  386. CPU_CFLAGS-y:=-mfdpic
  387. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  388. PICFLAG:=-fpic
  389. PIEFLAG_NAME:=-fpie
  390. endif
  391. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  392. PICFLAG := -mleaf-id-shared-library
  393. endif
  394. endif
  395. ifeq ($(TARGET_ARCH),frv)
  396. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  397. # Using -pie causes the program to have an interpreter, which is
  398. # forbidden, so we must make do with -shared. Unfortunately,
  399. # -shared by itself would get us global function descriptors
  400. # and calls through PLTs, dynamic resolution of symbols, etc,
  401. # which would break as well, but -Bsymbolic comes to the rescue.
  402. export LDPIEFLAG:=-shared -Wl,-Bsymbolic
  403. UCLIBC_LDSO=ld.so.1
  404. endif
  405. ifeq ($(strip $(TARGET_ARCH)),avr32)
  406. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  407. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  408. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  409. endif
  410. ifeq ($(TARGET_ARCH),i960)
  411. SYMBOL_PREFIX=_
  412. endif
  413. ifeq ($(TARGET_ARCH),microblaze)
  414. SYMBOL_PREFIX=_
  415. endif
  416. ifeq ($(TARGET_ARCH),v850)
  417. SYMBOL_PREFIX=_
  418. endif
  419. # Keep the check_gcc from being needlessly executed
  420. ifndef PIEFLAG
  421. export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
  422. endif
  423. # We need to keep track of both the CC PIE flag (above) as
  424. # well as the LD PIE flag (below) because we can't rely on
  425. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  426. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  427. ifndef LDPIEFLAG
  428. export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
  429. endif
  430. # Check for --as-needed support in linker
  431. ifndef LD_FLAG_ASNEEDED
  432. _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
  433. ifneq ($(_LD_FLAG_ASNEEDED),)
  434. export LD_FLAG_ASNEEDED:=--as-needed
  435. endif
  436. endif
  437. ifndef LD_FLAG_NO_ASNEEDED
  438. ifdef LD_FLAG_ASNEEDED
  439. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  440. endif
  441. endif
  442. ifndef CC_FLAG_ASNEEDED
  443. ifdef LD_FLAG_ASNEEDED
  444. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  445. endif
  446. endif
  447. ifndef CC_FLAG_NO_ASNEEDED
  448. ifdef LD_FLAG_NO_ASNEEDED
  449. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  450. endif
  451. endif
  452. link.asneeded = $(if $(and $(CC_FLAG_ASNEEDED),$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  453. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  454. ifndef ASNEEDED
  455. export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  456. endif
  457. # Add a bunch of extra pedantic annoyingly strict checks
  458. XWARNINGS=$(call qstrip,$(WARNINGS)) -Wstrict-prototypes -fno-strict-aliasing
  459. ifeq ($(EXTRA_WARNINGS),y)
  460. XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
  461. XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
  462. XWARNINGS+=-Wnonnull -Wundef
  463. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  464. #XWARNINGS+=-Wdeclaration-after-statement
  465. endif
  466. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  467. SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
  468. ifeq ($(UCLIBC_BUILD_SSP),y)
  469. SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
  470. SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
  471. SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
  472. else
  473. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  474. endif
  475. NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
  476. # Collect all CFLAGS components
  477. CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
  478. $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  479. -nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
  480. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
  481. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  482. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  483. endif
  484. # We need this to be checked within libc-symbols.h
  485. ifneq ($(HAVE_SHARED),y)
  486. CFLAGS += -DSTATIC
  487. endif
  488. LDFLAG_WARN_ONCE:=$(if $(call check_ld,--warn-once),-Wl$(comma)--warn-once)
  489. LDFLAG_SORT_COMMON:=$(if $(call check_ld,--sort-common),-Wl$(comma)--sort-common)
  490. LDFLAG_DISCARD_ALL:=$(if $(call check_ld,--discard-all),-Wl$(comma)--discard-all)
  491. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
  492. -Wl,--warn-common $(LDFLAG_WARN_ONCE) -Wl,-z,combreloc
  493. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  494. #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
  495. ifeq ($(UCLIBC_BUILD_RELRO),y)
  496. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  497. endif
  498. ifeq ($(UCLIBC_BUILD_NOW),y)
  499. LDFLAGS_NOSTRIP+=-Wl,-z,now
  500. endif
  501. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  502. # Be sure that binutils support it
  503. LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
  504. ifeq ($(LDFLAGS_GNUHASH),)
  505. ifneq ($(filter-out install_headers headers-y,$(MAKECMDGOALS)),)
  506. $(error Your binutils do not support --hash-style option, while you want to use it)
  507. endif
  508. else
  509. LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
  510. endif
  511. endif
  512. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  513. ifeq ($(DODEBUG),y)
  514. CFLAGS += -O0 -g3 -DDEBUG
  515. else
  516. CFLAGS += $(OPTIMIZATION)
  517. endif
  518. ifeq ($(DOSTRIP),y)
  519. LDFLAGS += -Wl,-s
  520. else
  521. STRIPTOOL := true -Stripping_disabled
  522. endif
  523. ifeq ($(DOMULTI),y)
  524. # we try to compile all sources at once into an object (IMA), but
  525. # gcc-3.3.x does not support it
  526. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  527. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  528. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  529. ifeq ($(GCC_MAJOR_VER),3)
  530. DOMULTI:=n
  531. else
  532. CFLAGS+=$(call check_gcc,--combine,)
  533. endif
  534. else
  535. DOMULTI:=n
  536. endif
  537. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  538. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  539. endif
  540. ifeq ($(UCLIBC_HAS_THREADS),y)
  541. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  542. PTNAME := nptl
  543. else
  544. ifeq ($(LINUXTHREADS_OLD),y)
  545. PTNAME := linuxthreads.old
  546. else
  547. PTNAME := linuxthreads
  548. endif
  549. endif
  550. PTDIR := libpthread/$(PTNAME)
  551. # set up system dependencies include dirs (NOTE: order matters!)
  552. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  553. PTINC:= -I$(top_srcdir)$(PTDIR) \
  554. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH) \
  555. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  556. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  557. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  558. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  559. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  560. -I$(top_srcdir)$(PTDIR)/sysdeps/generic \
  561. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  562. -I$(top_srcdir)ldso/include
  563. #
  564. # Test for TLS if NPTL support was selected.
  565. #
  566. GCC_HAS_TLS=$(shell \
  567. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  568. ifneq ($(GCC_HAS_TLS),)
  569. gcc_tls_test_fail:
  570. @echo "####";
  571. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  572. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  573. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  574. @echo "#### about this problem.";
  575. @echo "####";
  576. @echo "#### Exiting...";
  577. @echo "####";
  578. @exit 1;
  579. endif
  580. else
  581. PTINC := \
  582. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  583. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  584. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  585. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  586. -I$(top_srcdir)$(PTDIR) \
  587. -I$(top_srcdir)libpthread
  588. endif
  589. CFLAGS+=$(PTINC)
  590. else
  591. PTNAME :=
  592. PTINC :=
  593. endif
  594. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  595. CFLAGS += -I$(KERNEL_HEADERS)
  596. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  597. CC_IPREFIX := $(shell $(CC) --print-file-name=include)
  598. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  599. CFLAGS += $(CC_INC)
  600. ifneq ($(DOASSERTS),y)
  601. CFLAGS+=-DNDEBUG
  602. endif
  603. ifeq ($(SYMBOL_PREFIX),_)
  604. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  605. endif
  606. # Keep the check_as from being needlessly executed
  607. ifndef ASFLAGS_NOEXEC
  608. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  609. export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
  610. else
  611. export ASFLAGS_NOEXEC :=
  612. endif
  613. endif
  614. ASFLAGS = $(ASFLAGS_NOEXEC)
  615. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  616. LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
  617. LIBGCC_DIR:=$(dir $(LIBGCC))
  618. # moved from libpthread/linuxthreads
  619. ifeq ($(UCLIBC_CTOR_DTOR),y)
  620. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  621. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  622. endif
  623. LOCAL_INSTALL_PATH := install_dir