Rules.mak 22 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+=$(call check_gcc,-fomit-frame-pointer,)
  152. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
  153. # Non-SSE capable processor.
  154. # NB: this may make SSE insns segfault!
  155. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  156. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  157. # -m32 is needed if host is 64-bit
  158. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  159. else
  160. OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
  161. endif
  162. # Choice of alignment (please document why!)
  163. # -falign-labels: in-line labels
  164. # (reachable by normal code flow, aligning will insert nops
  165. # which will be executed - may even make things slower)
  166. # -falign-jumps: reachable only by a jump
  167. # Generic: no alignment at all (smallest code)
  168. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  169. ifeq ($(CONFIG_K7),y)
  170. # Align functions to four bytes, use default for jumps and loops (why?)
  171. GCC_FALIGN=$(call check_gcc,-falign-functions=4 -falign-labels=1,-malign-functions=4)
  172. endif
  173. ifeq ($(CONFIG_CRUSOE),y)
  174. # Use compiler's default for functions, jumps and loops (why?)
  175. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  176. endif
  177. ifeq ($(CONFIG_CYRIXIII),y)
  178. # Use compiler's default for functions, jumps and loops (why?)
  179. GCC_FALIGN=$(call check_gcc,-falign-functions=0 -falign-labels=1,-malign-functions=0)
  180. endif
  181. OPTIMIZATION+=$(GCC_FALIGN)
  182. # Putting each function and data object into its own section
  183. # allows for kbytes of less text if users link against static uclibc
  184. # using ld --gc-sections.
  185. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  186. # do not use --gc-sections at shared lib link time.
  187. # However, in combination with sections being sorted by alignment
  188. # it does result in much reduced padding:
  189. # text data bss dec hex
  190. # 235319 1472 5992 242783 3b45f old.so
  191. # 234104 1472 5980 241556 3af94 new.so
  192. # Without -ffunction-sections, all functions will get aligned
  193. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  194. # It specifies 4 byte align for .text even if not told to do so:
  195. # Idx Name Size VMA LMA File off Algn
  196. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  197. CPU_CFLAGS-y += $(call check_gcc,-ffunction-sections -fdata-sections,)
  198. ifneq ($(call check_ld,--sort-common,),)
  199. CPU_LDFLAGS-y += -Wl,--sort-common
  200. endif
  201. ifneq ($(call check_ld,--sort-section alignment),)
  202. CPU_LDFLAGS-y += -Wl,--sort-section,alignment
  203. endif
  204. CPU_LDFLAGS-y+=-m32
  205. CPU_CFLAGS-y+=-m32
  206. CPU_CFLAGS-$(CONFIG_386)+=-march=i386
  207. CPU_CFLAGS-$(CONFIG_486)+=-march=i486
  208. CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
  209. CPU_CFLAGS-$(CONFIG_586)+=-march=i586
  210. CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
  211. CPU_CFLAGS-$(CONFIG_686)+=-march=i686
  212. CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
  213. CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
  214. CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
  215. CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
  216. CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686)
  217. CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686
  218. CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
  219. CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
  220. CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486)
  221. CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
  222. endif
  223. ifeq ($(TARGET_ARCH),sparc)
  224. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  225. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  226. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  227. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  228. endif
  229. ifeq ($(TARGET_ARCH),arm)
  230. OPTIMIZATION+=-fstrict-aliasing
  231. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  232. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  233. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  234. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  235. CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
  236. CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
  237. CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
  238. CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
  239. CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
  240. CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
  241. CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
  242. CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
  243. CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
  244. CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
  245. CPU_CFLAGS-$(CONFIG_ARM1176JZ_S)+=-mtune=arm1176jz-s -march=armv6
  246. CPU_CFLAGS-$(CONFIG_ARM1176JZF_S)+=-mtune=arm1176jzf-s -march=armv6
  247. CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
  248. CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
  249. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
  250. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
  251. CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
  252. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M3)+=-mcpu=cortex-m3 -mthumb
  253. CPU_CFLAGS-$(CONFIG_ARM_CORTEX_M1)+=-mcpu=cortex-m1 -mthumb
  254. endif
  255. ifeq ($(TARGET_ARCH),mips)
  256. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  257. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  258. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  259. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  260. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  261. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  262. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  263. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
  264. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  265. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  266. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
  267. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
  268. endif
  269. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  270. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
  271. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
  272. endif
  273. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  274. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  275. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  276. endif
  277. ifeq ($(TARGET_ARCH),nios)
  278. CPU_LDFLAGS-y+=-Wl,-m32
  279. CPU_CFLAGS-y+=-Wl,-m32
  280. endif
  281. ifeq ($(TARGET_ARCH),sh)
  282. OPTIMIZATION+=-fstrict-aliasing
  283. OPTIMIZATION+= $(call check_gcc,-mprefergot,)
  284. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-Wl,-EL
  285. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-Wl,-EB
  286. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  287. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  288. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  289. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  290. ifeq ($(UCLIBC_HAS_FLOATS),y)
  291. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  292. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  293. else
  294. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  295. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  296. endif
  297. endif
  298. ifeq ($(TARGET_ARCH),sh64)
  299. OPTIMIZATION+=-fstrict-aliasing
  300. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-Wl,-EL
  301. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-Wl,-EB
  302. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  303. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  304. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  305. endif
  306. ifeq ($(TARGET_ARCH),h8300)
  307. SYMBOL_PREFIX=_
  308. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  309. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  310. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  311. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  312. endif
  313. ifeq ($(TARGET_ARCH),cris)
  314. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  315. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  316. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  317. PICFLAG:=-fpic
  318. PIEFLAG_NAME:=-fpie
  319. endif
  320. ifeq ($(TARGET_ARCH),m68k)
  321. # -fPIC is only supported for 68020 and above. It is not supported
  322. # for 68000, 68010, or Coldfire.
  323. PICFLAG:=-fpic
  324. PIEFLAG_NAME:=-fpie
  325. endif
  326. ifeq ($(TARGET_ARCH),powerpc)
  327. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  328. # enough. Therefore use -fpic which will reduce code size and generates
  329. # faster code.
  330. PICFLAG:=-fpic
  331. PIEFLAG_NAME:=-fpie
  332. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  333. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  334. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  335. endif
  336. ifeq ($(TARGET_ARCH),bfin)
  337. SYMBOL_PREFIX=_
  338. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  339. CPU_CFLAGS-y:=-mfdpic
  340. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  341. PICFLAG:=-fpic
  342. PIEFLAG_NAME:=-fpie
  343. endif
  344. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  345. PICFLAG := -mleaf-id-shared-library
  346. endif
  347. endif
  348. ifeq ($(TARGET_ARCH),frv)
  349. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  350. # Using -pie causes the program to have an interpreter, which is
  351. # forbidden, so we must make do with -shared. Unfortunately,
  352. # -shared by itself would get us global function descriptors
  353. # and calls through PLTs, dynamic resolution of symbols, etc,
  354. # which would break as well, but -Bsymbolic comes to the rescue.
  355. export LDPIEFLAG:=-Wl,-shared -Wl,-Bsymbolic
  356. UCLIBC_LDSO=ld.so.1
  357. endif
  358. ifeq ($(strip $(TARGET_ARCH)),avr32)
  359. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  360. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  361. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  362. endif
  363. ifeq ($(TARGET_ARCH),i960)
  364. SYMBOL_PREFIX=_
  365. endif
  366. ifeq ($(TARGET_ARCH),microblaze)
  367. SYMBOL_PREFIX=_
  368. endif
  369. ifeq ($(TARGET_ARCH),v850)
  370. SYMBOL_PREFIX=_
  371. endif
  372. # Keep the check_gcc from being needlessly executed
  373. ifndef PIEFLAG
  374. ifneq ($(UCLIBC_BUILD_PIE),y)
  375. export PIEFLAG:=
  376. else
  377. export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
  378. endif
  379. endif
  380. # We need to keep track of both the CC PIE flag (above) as
  381. # well as the LD PIE flag (below) because we can't rely on
  382. # gcc passing -pie if we used -fPIE
  383. ifndef LDPIEFLAG
  384. ifneq ($(UCLIBC_BUILD_PIE),y)
  385. export LDPIEFLAG:=
  386. else
  387. export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-Wl,-pie")
  388. endif
  389. endif
  390. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  391. ifndef ASNEEDED
  392. export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  393. endif
  394. # Add a bunch of extra pedantic annoyingly strict checks
  395. XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
  396. ifeq ($(EXTRA_WARNINGS),y)
  397. XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
  398. XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
  399. XWARNINGS+=-Wnonnull -Wundef
  400. # works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  401. #XWARNINGS+=-Wdeclaration-after-statement
  402. endif
  403. XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
  404. CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
  405. SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
  406. ifeq ($(UCLIBC_BUILD_SSP),y)
  407. SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
  408. SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
  409. SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
  410. else
  411. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  412. endif
  413. NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
  414. # Some nice CFLAGS to work with
  415. # Why -funsigned-char: I hunted a bug related to incorrect
  416. # sign extension of 'char' type for 10 hours straight. Not fun.
  417. CFLAGS := -include $(top_builddir)include/libc-symbols.h \
  418. $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  419. -funsigned-char -fno-builtin -nostdinc -I$(top_builddir)include -I. \
  420. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
  421. # Make sure that we can be built with non-C99 compilers, too.
  422. # Use __\1__ instead.
  423. CFLAGS += $(call check_gcc,-fno-asm,)
  424. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  425. CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
  426. endif
  427. LDADD_LIBFLOAT=
  428. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  429. # If -msoft-float isn't supported, we want an error anyway.
  430. # Hmm... might need to revisit this for arm since it has 2 different
  431. # soft float encodings.
  432. ifneq ($(TARGET_ARCH),nios)
  433. ifneq ($(TARGET_ARCH),nios2)
  434. ifneq ($(TARGET_ARCH),sh)
  435. CFLAGS += -msoft-float
  436. endif
  437. endif
  438. endif
  439. ifeq ($(TARGET_ARCH),arm)
  440. # No longer needed with current toolchains, but leave it here for now.
  441. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  442. # LDADD_LIBFLOAT=-lfloat
  443. endif
  444. endif
  445. # Please let us see private headers' parts
  446. CFLAGS += -DUCLIBC_INTERNAL
  447. # We need this to be checked within libc-symbols.h
  448. ifneq ($(HAVE_SHARED),y)
  449. CFLAGS += -DSTATIC
  450. endif
  451. CFLAGS += $(call check_gcc,-std=gnu99,)
  452. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -Wl,-shared \
  453. -Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
  454. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  455. #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
  456. ifeq ($(UCLIBC_BUILD_RELRO),y)
  457. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  458. endif
  459. ifeq ($(UCLIBC_BUILD_NOW),y)
  460. LDFLAGS_NOSTRIP+=-Wl,-z,now
  461. endif
  462. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  463. # Be sure that binutils support it
  464. LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
  465. ifeq ($(LDFLAGS_GNUHASH),)
  466. $(error Your binutils don't support --hash-style option, while you want to use it)
  467. else
  468. LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
  469. endif
  470. endif
  471. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  472. ifeq ($(DODEBUG),y)
  473. CFLAGS += -O0 -g3
  474. else
  475. CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
  476. endif
  477. ifeq ($(DOSTRIP),y)
  478. LDFLAGS += -Wl,-s
  479. else
  480. STRIPTOOL := true -Stripping_disabled
  481. endif
  482. ifeq ($(DOMULTI),y)
  483. # we try to compile all sources at once into an object (IMA), but
  484. # gcc-3.3.x does not support it
  485. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  486. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  487. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  488. ifeq ($(GCC_MAJOR_VER),3)
  489. DOMULTI:=n
  490. else
  491. CFLAGS+=$(call check_gcc,--combine,)
  492. endif
  493. else
  494. DOMULTI:=n
  495. endif
  496. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  497. LDFLAGS += $(subst ",, $(UCLIBC_EXTRA_LDFLAGS))
  498. endif
  499. ifeq ($(UCLIBC_HAS_THREADS),y)
  500. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  501. PTNAME := nptl
  502. else
  503. ifeq ($(LINUXTHREADS_OLD),y)
  504. PTNAME := linuxthreads.old
  505. else
  506. PTNAME := linuxthreads
  507. endif
  508. endif
  509. PTDIR := $(top_builddir)libpthread/$(PTNAME)
  510. # set up system dependencies include dirs (NOTE: order matters!)
  511. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  512. PTINC:= -I$(PTDIR) \
  513. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  514. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  515. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  516. -I$(PTDIR)/sysdeps/pthread \
  517. -I$(PTDIR)/sysdeps/pthread/bits \
  518. -I$(PTDIR)/sysdeps/generic \
  519. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  520. -I$(top_srcdir)ldso/include
  521. #
  522. # Test for TLS if NPTL support was selected.
  523. #
  524. GCC_HAS_TLS=$(shell \
  525. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  526. ifneq ($(GCC_HAS_TLS),)
  527. gcc_tls_test_fail:
  528. @echo "####";
  529. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  530. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  531. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  532. @echo "#### about this problem.";
  533. @echo "####";
  534. @echo "#### Exiting...";
  535. @echo "####";
  536. @exit 1;
  537. endif
  538. else
  539. PTINC := \
  540. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  541. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  542. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  543. -I$(PTDIR)/sysdeps/pthread \
  544. -I$(PTDIR) \
  545. -I$(top_builddir)libpthread
  546. endif
  547. CFLAGS+=$(PTINC)
  548. else
  549. PTNAME :=
  550. PTINC :=
  551. endif
  552. CFLAGS += -I$(KERNEL_HEADERS)
  553. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  554. CC_IPREFIX:=$(shell $(CC) --print-file-name=include)
  555. CFLAGS += -I$(dir $(CC_IPREFIX))/include-fixed -I$(CC_IPREFIX)
  556. ifneq ($(DOASSERTS),y)
  557. CFLAGS+=-DNDEBUG
  558. endif
  559. ifeq ($(SYMBOL_PREFIX),_)
  560. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  561. endif
  562. # Keep the check_as from being needlessly executed
  563. ifndef ASFLAGS_NOEXEC
  564. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  565. export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
  566. else
  567. export ASFLAGS_NOEXEC :=
  568. endif
  569. endif
  570. ASFLAGS = $(ASFLAGS_NOEXEC)
  571. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  572. LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
  573. LIBGCC_DIR:=$(dir $(LIBGCC))
  574. # moved from libpthread/linuxthreads
  575. ifeq ($(UCLIBC_CTOR_DTOR),y)
  576. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  577. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  578. endif
  579. LOCAL_INSTALL_PATH := install_dir