Rules.mak 21 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. # check for proper make version
  8. ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  9. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  10. endif
  11. #-----------------------------------------------------------
  12. # This file contains rules which are shared between multiple
  13. # Makefiles. All normal configuration options live in the
  14. # file named ".config". Don't mess with this file unless
  15. # 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.
  22. #
  23. # Most people will set this stuff on the command line, i.e.
  24. # make CROSS=arm-linux-
  25. # will build uClibc for 'arm'.
  26. ifndef CROSS
  27. CROSS=
  28. endif
  29. CC = $(CROSS)gcc
  30. AR = $(CROSS)ar
  31. LD = $(CROSS)ld
  32. NM = $(CROSS)nm
  33. STRIPTOOL = $(CROSS)strip
  34. INSTALL = install
  35. LN = ln
  36. RM = rm -f
  37. TAR = tar
  38. SED = sed
  39. AWK = awk
  40. STRIP_FLAGS ?= -x -R .note -R .comment
  41. UNIFDEF := $(top_builddir)extra/scripts/unifdef -UUCLIBC_INTERNAL
  42. # Select the compiler needed to build binaries for your development system
  43. HOSTCC = gcc
  44. BUILD_CFLAGS = -O2 -Wall
  45. export ARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \
  46. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  47. -e s/arm.*/arm/ -e s/sa110/arm/ \
  48. -e s/sh.*/sh/ \
  49. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  50. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  51. -e s/xtensa.*/xtensa/ )
  52. #---------------------------------------------------------
  53. # Nothing beyond this point should ever be touched by mere
  54. # mortals. Unless you hang out with the gods, you should
  55. # probably leave all this stuff alone.
  56. # Pull in the user's uClibc configuration
  57. ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  58. -include $(top_builddir).config
  59. endif
  60. # Make certain these contain a final "/", but no "//"s.
  61. TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_ARCH=//' -e 's/"//g')
  62. TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
  63. TARGET_SUBARCH:=$(shell grep -s '^TARGET_SUBARCH' $(top_builddir)/.config | $(SED) -e 's/^TARGET_SUBARCH=//' -e 's/"//g')
  64. TARGET_SUBARCH:=$(strip $(subst ",, $(strip $(TARGET_SUBARCH))))
  65. RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
  66. DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
  67. KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_HEADERS))))))
  68. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS
  69. # Now config hard core
  70. MAJOR_VERSION := 0
  71. MINOR_VERSION := 9
  72. SUBLEVEL := 30
  73. EXTRAVERSION :=-svn
  74. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  75. ifneq ($(EXTRAVERSION),)
  76. VERSION := $(VERSION)$(EXTRAVERSION)
  77. endif
  78. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  79. LC_ALL := C
  80. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
  81. LIBC := libc
  82. SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
  83. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
  84. UCLIBC_LDSO_NAME := ld64-uClibc
  85. ARCH_NATIVE_BIT := 64
  86. else
  87. UCLIBC_LDSO_NAME := ld-uClibc
  88. ARCH_NATIVE_BIT := 32
  89. endif
  90. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
  91. NONSHARED_LIBNAME := uclibc_nonshared.a
  92. libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
  93. libc.depend := $(top_builddir)lib/$(SHARED_MAJORNAME:.$(MAJOR_VERSION)=)
  94. interp := $(top_builddir)lib/interp.os
  95. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  96. headers_dep := $(top_builddir)include/bits/sysnum.h
  97. sub_headers := $(headers_dep)
  98. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  99. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
  100. # Make sure DESTDIR and PREFIX can be used to install
  101. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  102. ifndef PREFIX
  103. PREFIX = $(DESTDIR)
  104. endif
  105. ifneq ($(HAVE_SHARED),y)
  106. libc :=
  107. interp :=
  108. ldso :=
  109. endif
  110. comma:=,
  111. space:= #
  112. ifndef CROSS
  113. CROSS=$(strip $(subst ",, $(CROSS_COMPILER_PREFIX)))
  114. endif
  115. # A nifty macro to make testing gcc features easier
  116. check_gcc=$(shell \
  117. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  118. then echo "$(1)"; else echo "$(2)"; fi)
  119. check_as=$(shell \
  120. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  121. then echo "-Wa,$(1)"; fi)
  122. check_ld=$(shell \
  123. if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
  124. then echo "$(1)"; fi)
  125. ARFLAGS:=cr
  126. # Flags in OPTIMIZATION are used only for non-debug builds
  127. OPTIMIZATION:=
  128. # Use '-Os' optimization if available, else use -O2, allow Config to override
  129. OPTIMIZATION+=$(call check_gcc,-Os,-O2)
  130. # Use the gcc 3.4 -funit-at-a-time optimization when available
  131. OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
  132. GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
  133. #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
  134. ifeq ($(GCC_MAJOR_VER),4)
  135. # shrinks code, results are from 4.0.2
  136. # 0.36%
  137. OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
  138. # 0.34%
  139. OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
  140. # 0.1%
  141. OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
  142. endif
  143. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  144. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  145. PICFLAG-y := -fPIC
  146. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  147. PICFLAG := $(PICFLAG-y)
  148. PIEFLAG_NAME:=-fPIE
  149. # Some nice CPU specific optimizations
  150. ifeq ($(TARGET_ARCH),i386)
  151. OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
  152. # NB: this may make SSE insns segfault!
  153. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  154. # TODO: conditionally bump to 4
  155. # (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685)
  156. OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
  157. # Choice of alignment (please document why!)
  158. # -falign-labels: in-line labels
  159. # (reachable by normal code flow, aligning will insert nops
  160. # which will be executed - may even make things slower)
  161. # -falign-jumps: reachable only by a jump
  162. # Generic: no alignment at all (smallest code)
  163. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  164. ifeq ($(CONFIG_K7),y)
  165. # Align functions to four bytes, use default for jumps and loops (why?)
  166. GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
  167. endif
  168. ifeq ($(CONFIG_CRUSOE),y)
  169. # Use compiler's default for functions, jumps and loops (why?)
  170. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  171. endif
  172. ifeq ($(CONFIG_CYRIXIII),y)
  173. # Use compiler's default for functions, jumps and loops (why?)
  174. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  175. endif
  176. OPTIMIZATION+=$(GCC_FALIGN)
  177. # Putting each function and data object into its own section
  178. # allows for kbytes of less text if users link against static uclibc
  179. # using ld --gc-sections.
  180. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  181. # do not use --gc-sections at shared lib link time.
  182. # However, in combination with sections being sorted by alignment
  183. # it does result in much reduced padding:
  184. # text data bss dec hex
  185. # 235319 1472 5992 242783 3b45f old.so
  186. # 234104 1472 5980 241556 3af94 new.so
  187. # Without -ffunction-sections, all functions will get aligned
  188. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  189. # It specifies 4 byte align for .text even if not told to do so:
  190. # Idx Name Size VMA LMA File off Algn
  191. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  192. CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
  193. ifneq ($(call check_ld,--sort-common,),)
  194. CPU_LDFLAGS-y += -Wl,--sort-common
  195. endif
  196. ifneq ($(call check_ld,--sort-section alignment),)
  197. CPU_LDFLAGS-y += -Wl,--sort-section,alignment
  198. endif
  199. CPU_LDFLAGS-y+=-m32
  200. CPU_CFLAGS-y+=-m32
  201. CPU_CFLAGS-$(CONFIG_386)+=-march=i386
  202. CPU_CFLAGS-$(CONFIG_486)+=-march=i486
  203. CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
  204. CPU_CFLAGS-$(CONFIG_586)+=-march=i586
  205. CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
  206. CPU_CFLAGS-$(CONFIG_686)+=-march=i686
  207. CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
  208. CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
  209. CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
  210. CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
  211. CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
  212. CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
  213. CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
  214. CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
  215. CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
  216. CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
  217. endif
  218. ifeq ($(TARGET_ARCH),sparc)
  219. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  220. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  221. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  222. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  223. endif
  224. ifeq ($(TARGET_ARCH),arm)
  225. OPTIMIZATION+=-fstrict-aliasing
  226. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  227. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  228. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  229. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  230. CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
  231. CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
  232. CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
  233. CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
  234. CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
  235. CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
  236. CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
  237. CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
  238. CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
  239. CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
  240. CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
  241. CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
  242. CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
  243. CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
  244. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
  245. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
  246. CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
  247. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
  248. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
  249. endif
  250. ifeq ($(TARGET_ARCH),mips)
  251. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  252. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  253. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  254. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  255. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  256. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  257. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  258. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
  259. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  260. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  261. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
  262. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
  263. endif
  264. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  265. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
  266. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
  267. endif
  268. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  269. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  270. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  271. endif
  272. ifeq ($(TARGET_ARCH),nios)
  273. CPU_LDFLAGS-y+=-Wl,-m32
  274. CPU_CFLAGS-y+=-Wl,-m32
  275. endif
  276. ifeq ($(TARGET_ARCH),sh)
  277. OPTIMIZATION+=-fstrict-aliasing
  278. OPTIMIZATION+= $(call check_gcc,-mprefergot,)
  279. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  280. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  281. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  282. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  283. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  284. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  285. ifeq ($(UCLIBC_HAS_FLOATS),y)
  286. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  287. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  288. else
  289. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  290. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  291. endif
  292. endif
  293. ifeq ($(TARGET_ARCH),sh64)
  294. OPTIMIZATION+=-fstrict-aliasing
  295. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-Wl,-EL
  296. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-Wl,-EB
  297. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  298. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  299. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  300. endif
  301. ifeq ($(TARGET_ARCH),h8300)
  302. SYMBOL_PREFIX=_
  303. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  304. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  305. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  306. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  307. endif
  308. ifeq ($(TARGET_ARCH),cris)
  309. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  310. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  311. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  312. PICFLAG:=-fpic
  313. PIEFLAG_NAME:=-fpie
  314. endif
  315. ifeq ($(TARGET_ARCH),m68k)
  316. # -fPIC is only supported for 68020 and above. It is not supported
  317. # for 68000, 68010, or Coldfire.
  318. PICFLAG:=-fpic
  319. PIEFLAG_NAME:=-fpie
  320. endif
  321. ifeq ($(TARGET_ARCH),powerpc)
  322. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  323. # enough. Therefore use -fpic which will reduce code size and generates
  324. # faster code.
  325. PICFLAG:=-fpic
  326. PIEFLAG_NAME:=-fpie
  327. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  328. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  329. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  330. endif
  331. ifeq ($(TARGET_ARCH),bfin)
  332. SYMBOL_PREFIX=_
  333. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  334. CPU_CFLAGS-y:=-mfdpic
  335. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  336. PICFLAG:=-fpic
  337. PIEFLAG_NAME:=-fpie
  338. endif
  339. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  340. PICFLAG := -mleaf-id-shared-library
  341. endif
  342. endif
  343. ifeq ($(TARGET_ARCH),frv)
  344. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  345. # Using -pie causes the program to have an interpreter, which is
  346. # forbidden, so we must make do with -shared. Unfortunately,
  347. # -shared by itself would get us global function descriptors
  348. # and calls through PLTs, dynamic resolution of symbols, etc,
  349. # which would break as well, but -Bsymbolic comes to the rescue.
  350. export LDPIEFLAG:=-Wl,-shared -Wl,-Bsymbolic
  351. UCLIBC_LDSO=ld.so.1
  352. endif
  353. ifeq ($(strip $(TARGET_ARCH)),avr32)
  354. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  355. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  356. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  357. endif
  358. ifeq ($(TARGET_ARCH),i960)
  359. SYMBOL_PREFIX=_
  360. endif
  361. ifeq ($(TARGET_ARCH),microblaze)
  362. SYMBOL_PREFIX=_
  363. endif
  364. ifeq ($(TARGET_ARCH),v850)
  365. SYMBOL_PREFIX=_
  366. endif
  367. # Keep the check_gcc from being needlessly executed
  368. ifndef PIEFLAG
  369. ifneq ($(UCLIBC_BUILD_PIE),y)
  370. export PIEFLAG:=
  371. else
  372. export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
  373. endif
  374. endif
  375. # We need to keep track of both the CC PIE flag (above) as
  376. # well as the LD PIE flag (below) because we can't rely on
  377. # gcc passing -pie if we used -fPIE
  378. ifndef LDPIEFLAG
  379. ifneq ($(UCLIBC_BUILD_PIE),y)
  380. export LDPIEFLAG:=
  381. else
  382. export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-Wl,-pie")
  383. endif
  384. endif
  385. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  386. ifndef ASNEEDED
  387. export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  388. endif
  389. # Add a bunch of extra pedantic annoyingly strict checks
  390. XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
  391. ifeq ($(EXTRA_WARNINGS),y)
  392. XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
  393. XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
  394. XWARNINGS+=-Wnonnull -Wundef
  395. # works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  396. #XWARNINGS+=-Wdeclaration-after-statement
  397. endif
  398. XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
  399. CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
  400. SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
  401. ifeq ($(UCLIBC_BUILD_SSP),y)
  402. SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
  403. SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
  404. SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
  405. else
  406. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  407. endif
  408. NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
  409. # Some nice CFLAGS to work with
  410. CFLAGS := -include $(top_builddir)include/libc-symbols.h \
  411. $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  412. -fno-builtin -nostdinc -I$(top_builddir)include -I. \
  413. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
  414. # Make sure that we can be built with non-C99 compilers, too.
  415. # Use __\1__ instead.
  416. CFLAGS += $(call check_gcc,-fno-asm,)
  417. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  418. CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
  419. endif
  420. LDADD_LIBFLOAT=
  421. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  422. # If -msoft-float isn't supported, we want an error anyway.
  423. # Hmm... might need to revisit this for arm since it has 2 different
  424. # soft float encodings.
  425. ifneq ($(TARGET_ARCH),nios)
  426. ifneq ($(TARGET_ARCH),nios2)
  427. ifneq ($(TARGET_ARCH),sh)
  428. CFLAGS += -msoft-float
  429. endif
  430. endif
  431. endif
  432. ifeq ($(TARGET_ARCH),arm)
  433. # No longer needed with current toolchains, but leave it here for now.
  434. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  435. # LDADD_LIBFLOAT=-lfloat
  436. endif
  437. endif
  438. # Please let us see private headers' parts
  439. CFLAGS += -DUCLIBC_INTERNAL
  440. # We need this to be checked within libc-symbols.h
  441. ifneq ($(HAVE_SHARED),y)
  442. CFLAGS += -DSTATIC
  443. endif
  444. CFLAGS += $(call check_gcc,-std=gnu99,)
  445. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -Wl,-shared \
  446. -Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
  447. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  448. #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
  449. ifeq ($(UCLIBC_BUILD_RELRO),y)
  450. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  451. endif
  452. ifeq ($(UCLIBC_BUILD_NOW),y)
  453. LDFLAGS_NOSTRIP+=-Wl,-z,now
  454. endif
  455. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  456. # Be sure that binutils support it
  457. LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
  458. ifeq ($(LDFLAGS_GNUHASH),)
  459. $(error Your binutils don't support --hash-style option, while you want to use it)
  460. else
  461. LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
  462. endif
  463. endif
  464. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  465. ifeq ($(DODEBUG),y)
  466. CFLAGS += -O0 -g3
  467. else
  468. CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
  469. endif
  470. ifeq ($(DOSTRIP),y)
  471. LDFLAGS += -Wl,-s
  472. else
  473. STRIPTOOL := true -Stripping_disabled
  474. endif
  475. ifeq ($(DOMULTI),y)
  476. # we try to compile all sources at once into an object (IMA), but
  477. # gcc-3.3.x does not support it
  478. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  479. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  480. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  481. ifeq ($(GCC_MAJOR_VER),3)
  482. DOMULTI:=n
  483. else
  484. CFLAGS+=$(call check_gcc,--combine,)
  485. endif
  486. else
  487. DOMULTI:=n
  488. endif
  489. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  490. LDFLAGS += $(subst ",, $(UCLIBC_EXTRA_LDFLAGS))
  491. endif
  492. ifeq ($(UCLIBC_HAS_THREADS),y)
  493. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  494. PTNAME := nptl
  495. else
  496. ifeq ($(LINUXTHREADS_OLD),y)
  497. PTNAME := linuxthreads.old
  498. else
  499. PTNAME := linuxthreads
  500. endif
  501. endif
  502. PTDIR := $(top_builddir)libpthread/$(PTNAME)
  503. # set up system dependencies include dirs (NOTE: order matters!)
  504. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  505. PTINC:= -I$(PTDIR) \
  506. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  507. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  508. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  509. -I$(PTDIR)/sysdeps/pthread \
  510. -I$(PTDIR)/sysdeps/pthread/bits \
  511. -I$(PTDIR)/sysdeps/generic \
  512. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  513. -I$(top_srcdir)ldso/include
  514. #
  515. # Test for TLS if NPTL support was selected.
  516. #
  517. GCC_HAS_TLS=$(shell \
  518. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  519. ifneq ($(GCC_HAS_TLS),)
  520. gcc_tls_test_fail:
  521. @echo "####";
  522. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  523. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  524. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  525. @echo "#### about this problem.";
  526. @echo "####";
  527. @echo "#### Exiting...";
  528. @echo "####";
  529. @exit 1;
  530. endif
  531. else
  532. PTINC := \
  533. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  534. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  535. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  536. -I$(PTDIR)/sysdeps/pthread \
  537. -I$(PTDIR) \
  538. -I$(top_builddir)libpthread
  539. endif
  540. CFLAGS+=$(PTINC)
  541. else
  542. PTNAME :=
  543. PTINC :=
  544. endif
  545. CFLAGS += -I$(KERNEL_HEADERS)
  546. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  547. CC_IPREFIX:=$(shell $(CC) --print-file-name=include)
  548. CFLAGS += -I$(dir $(CC_IPREFIX))/include-fixed -I$(CC_IPREFIX)
  549. ifneq ($(DOASSERTS),y)
  550. CFLAGS+=-DNDEBUG
  551. endif
  552. ifeq ($(SYMBOL_PREFIX),_)
  553. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  554. endif
  555. # Keep the check_as from being needlessly executed
  556. ifndef ASFLAGS_NOEXEC
  557. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  558. export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
  559. else
  560. export ASFLAGS_NOEXEC :=
  561. endif
  562. endif
  563. ASFLAGS = $(ASFLAGS_NOEXEC)
  564. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  565. LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
  566. LIBGCC_DIR:=$(dir $(LIBGCC))
  567. # moved from libpthread/linuxthreads
  568. ifeq ($(UCLIBC_CTOR_DTOR),y)
  569. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  570. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  571. endif
  572. LOCAL_INSTALL_PATH := install_dir